1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
|
config ARM
bool
default y
select ARCH_BINFMT_ELF_RANDOMIZE_PIE
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT if MMU
select CLONE_BACKWARDS
select CPU_PM if (SUSPEND || CPU_IDLE)
select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS
select GENERIC_ALLOCATOR
select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_TRACEHOOK
select HAVE_BPF_JIT
select HAVE_CC_STACKPROTECTOR
select HAVE_CONTEXT_TRACKING
select HAVE_C_RECORDMCOUNT
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_API_DEBUG
select HAVE_DMA_ATTRS
select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
select HAVE_GENERIC_DMA_COHERENT
select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
select HAVE_IDE if PCI || ISA || PCMCIA
select HAVE_IRQ_TIME_ACCOUNTING
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZ4
select HAVE_KERNEL_LZMA
select HAVE_KERNEL_LZO
select HAVE_KERNEL_XZ
select HAVE_KPROBES if !XIP_KERNEL
select HAVE_KRETPROBES if (HAVE_KPROBES)
select HAVE_MEMBLOCK
select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16
select HAVE_VIRT_CPU_ACCOUNTING_GEN
select IRQ_FORCED_THREADING
select MODULES_USE_ELF_REL
select NO_BOOTMEM
select OLD_SIGACTION
select OLD_SIGSUSPEND3
select PERF_USE_VMALLOC
select RTC_LIB
select SYS_SUPPORTS_APM_EMULATION
# Above selects are sorted alphabetically; please add new ones
# according to that. Thanks.
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
manufactured, but legacy ARM-based PC hardware remains popular in
Europe. There is an ARM Linux project with a web page at
<http://www.arm.linux.org.uk/>.
config ARM_HAS_SG_CHAIN
select ARCH_HAS_SG_CHAIN
bool
config NEED_SG_DMA_LENGTH
bool
config ARM_DMA_USE_IOMMU
bool
select ARM_HAS_SG_CHAIN
select NEED_SG_DMA_LENGTH
if ARM_DMA_USE_IOMMU
config ARM_DMA_IOMMU_ALIGNMENT
int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
range 4 9
default 8
help
DMA mapping framework by default aligns all buffers to the smallest
PAGE_SIZE order which is greater than or equal to the requested buffer
size. This works well for buffers up to a few hundreds kilobytes, but
for larger buffers it just a waste of address space. Drivers which has
relatively small addressing window (like 64Mib) might run out of
virtual space with just a few allocations.
With this parameter you can specify the maximum PAGE_SIZE order for
DMA IOMMU buffers. Larger buffers will be aligned only to this
specified order. The order is expressed as a power of two multiplied
by the PAGE_SIZE.
endif
config MIGHT_HAVE_PCI
bool
config SYS_SUPPORTS_APM_EMULATION
bool
config HAVE_TCM
bool
select GENERIC_ALLOCATOR
config HAVE_PROC_CPU
bool
config NO_IOPORT_MAP
bool
config EISA
bool
---help---
The Extended Industry Standard Architecture (EISA) bus was
developed as an open alternative to the IBM MicroChannel bus.
The EISA bus provided some of the features of the IBM MicroChannel
bus while maintaining backward compatibility with cards made for
the older ISA bus. The EISA bus saw limited use between 1988 and
1995 when it was made obsolete by the PCI bus.
Say Y here if you are building a kernel for an EISA-based machine.
Otherwise, say N.
config SBUS
bool
config STACKTRACE_SUPPORT
bool
default y
config HAVE_LATENCYTOP_SUPPORT
bool
depends on !SMP
default y
config LOCKDEP_SUPPORT
bool
default y
config TRACE_IRQFLAGS_SUPPORT
bool
default y
config RWSEM_XCHGADD_ALGORITHM
bool
default y
config ARCH_HAS_ILOG2_U32
bool
config ARCH_HAS_ILOG2_U64
bool
config ARCH_HAS_BANDGAP
bool
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
config ZONE_DMA
bool
config NEED_DMA_MAP_STATE
def_bool y
config ARCH_SUPPORTS_UPROBES
def_bool y
config ARCH_HAS_DMA_SET_COHERENT_MASK
bool
config GENERIC_ISA_DMA
bool
config FIQ
bool
config NEED_RET_TO_USER
bool
config ARCH_MTD_XIP
bool
config VECTORS_BASE
hex
default 0xffff0000 if MMU || CPU_HIGH_VECTOR
default DRAM_BASE if REMAP_VECTORS_TO_RAM
default 0x00000000
help
The base address of exception vectors. This must be two pages
in size.
config ARM_PATCH_PHYS_VIRT
bool "Patch physical to virtual translations at runtime" if EMBEDDED
default y
depends on !XIP_KERNEL && MMU
depends on !ARCH_REALVIEW || !SPARSEMEM
help
Patch phys-to-virt and virt-to-phys translation functions at
boot and module load time according to the position of the
kernel in system memory.
This can only be used with non-XIP MMU kernels where the base
of physical memory is at a 16MB boundary.
Only disable this option if you know that you do not require
this feature (eg, building a kernel for a single machine) and
you need to shrink the kernel to the minimal size.
config NEED_MACH_IO_H
bool
help
Select this when mach/io.h is required to provide special
definitions for this platform. The need for mach/io.h should
be avoided when possible.
config NEED_MACH_MEMORY_H
bool
help
Select this when mach/memory.h is required to provide special
definitions for this platform. The need for mach/memory.h should
be avoided when possible.
config PHYS_OFFSET
hex "Physical address of main memory" if MMU
depends on !ARM_PATCH_PHYS_VIRT
default DRAM_BASE if !MMU
default 0x00000000 if ARCH_EBSA110 || \
EP93XX_SDCE3_SYNC_PHYS_OFFSET || \
ARCH_FOOTBRIDGE || \
ARCH_INTEGRATOR || \
ARCH_IOP13XX || \
ARCH_KS8695 || \
(ARCH_REALVIEW && !REALVIEW_HIGH_PHYS_OFFSET)
default 0x10000000 if ARCH_OMAP1 || ARCH_RPC
default 0x20000000 if ARCH_S5PV210
default 0x70000000 if REALVIEW_HIGH_PHYS_OFFSET
default 0xc0000000 if EP93XX_SDCE0_PHYS_OFFSET || ARCH_SA1100
default 0xd0000000 if EP93XX_SDCE1_PHYS_OFFSET
default 0xe0000000 if EP93XX_SDCE2_PHYS_OFFSET
default 0xf0000000 if EP93XX_SDCE3_ASYNC_PHYS_OFFSET
help
Please provide the physical address corresponding to the
location of main memory in your system.
config GENERIC_BUG
def_bool y
depends on BUG
source "init/Kconfig"
source "kernel/Kconfig.freezer"
menu "System Type"
config MMU
bool "MMU-based Paged Memory Management Support"
default y
help
Select if you want MMU-based virtualised addressing space
support by paged memory management. If unsure, say 'Y'.
#
# The "ARM system type" choice list is ordered alphabetically by option
# text. Please add new entries in the option alphabetic order.
#
choice
prompt "ARM system type"
default ARCH_VERSATILE if !MMU
default ARCH_MULTIPLATFORM if MMU
config ARCH_MULTIPLATFORM
bool "Allow multiple platforms to be selected"
depends on MMU
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARM_HAS_SG_CHAIN
select ARM_PATCH_PHYS_VIRT
select AUTO_ZRELADDR
select CLKSRC_OF
select COMMON_CLK
select GENERIC_CLOCKEVENTS
select MIGHT_HAVE_PCI
select MULTI_IRQ_HANDLER
select SPARSE_IRQ
select USE_OF
config ARCH_REALVIEW
bool "ARM Ltd. RealView family"
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARM_AMBA
select ARM_TIMER_SP804
select COMMON_CLK
select COMMON_CLK_VERSATILE
select GENERIC_CLOCKEVENTS
select GPIO_PL061 if GPIOLIB
select ICST
select NEED_MACH_MEMORY_H
select PLAT_VERSATILE
select PLAT_VERSATILE_SCHED_CLOCK
help
This enables support for ARM Ltd RealView boards.
config ARCH_VERSATILE
bool "ARM Ltd. Versatile family"
select ARCH_WANT_OPTIONAL_GPIOLIB
select ARM_AMBA
select ARM_TIMER_SP804
select ARM_VIC
select CLKDEV_LOOKUP
select GENERIC_CLOCKEVENTS
select HAVE_MACH_CLKDEV
select ICST
select PLAT_VERSATILE
select PLAT_VERSATILE_CLOCK
select PLAT_VERSATILE_SCHED_CLOCK
select VERSATILE_FPGA_IRQ
help
This enables support for ARM Ltd Versatile board.
config ARCH_AT91
bool "Atmel AT91"
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select IRQ_DOMAIN
select NEED_MACH_IO_H if PCCARD
select PINCTRL
select PINCTRL_AT91
select USE_OF
help
This enables support for systems based on Atmel
AT91RM9200, AT91SAM9 and SAMA5 processors.
config ARCH_CLPS711X
bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"
select ARCH_REQUIRE_GPIOLIB
select AUTO_ZRELADDR
select CLKSRC_MMIO
select COMMON_CLK
select CPU_ARM720T
select GENERIC_CLOCKEVENTS
select MFD_SYSCON
select SOC_BUS
help
Support for Cirrus Logic 711x/721x/731x based boards.
config ARCH_GEMINI
bool "Cortina Systems Gemini"
select ARCH_REQUIRE_GPIOLIB
select CLKSRC_MMIO
select CPU_FA526
select GENERIC_CLOCKEVENTS
help
Support for the Cortina Systems Gemini family SoCs
config ARCH_EBSA110
bool "EBSA-110"
select ARCH_USES_GETTIMEOFFSET
select CPU_SA110
select ISA
select NEED_MACH_IO_H
select NEED_MACH_MEMORY_H
select NO_IOPORT_MAP
help
This is an evaluation board for the StrongARM processor available
from Digital. It has limited hardware on-board, including an
Ethernet interface, two PCMCIA sockets, two serial ports and a
parallel port.
config ARCH_EFM32
bool "Energy Micro efm32"
depends on !MMU
select ARCH_REQUIRE_GPIOLIB
select ARM_NVIC
select AUTO_ZRELADDR
select CLKSRC_OF
select COMMON_CLK
select CPU_V7M
select GENERIC_CLOCKEVENTS
select NO_DMA
select NO_IOPORT_MAP
select SPARSE_IRQ
select USE_OF
help
Support for Energy Micro's (now Silicon Labs) efm32 Giant Gecko
processors.
config ARCH_EP93XX
bool "EP93xx-based"
select ARCH_HAS_HOLES_MEMORYMODEL
select ARCH_REQUIRE_GPIOLIB
select ARCH_USES_GETTIMEOFFSET
select ARM_AMBA
select ARM_VIC
select CLKDEV_LOOKUP
select CPU_ARM920T
help
This enables support for the Cirrus EP93xx series of CPUs.
config ARCH_FOOTBRIDGE
bool "FootBridge"
select CPU_SA110
select FOOTBRIDGE
select GENERIC_CLOCKEVENTS
select HAVE_IDE
select NEED_MACH_IO_H if !MMU
select NEED_MACH_MEMORY_H
help
Support for systems based on the DC21285 companion chip
("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
config ARCH_NETX
bool "Hilscher NetX based"
select ARM_VIC
select CLKSRC_MMIO
select CPU_ARM926T
select GENERIC_CLOCKEVENTS
help
This enables support for systems based on the Hilscher NetX Soc
config ARCH_IOP13XX
bool "IOP13xx-based"
depends on MMU
select CPU_XSC3
select NEED_MACH_MEMORY_H
select NEED_RET_TO_USER
select PCI
select PLAT_IOP
select VMSPLIT_1G
select SPARSE_IRQ
help
Support for Intel's IOP13XX (XScale) family of processors.
config ARCH_IOP32X
bool "IOP32x-based"
depends on MMU
select ARCH_REQUIRE_GPIOLIB
select CPU_XSCALE
select GPIO_IOP
select NEED_RET_TO_USER
select PCI
select PLAT_IOP
help
Support for Intel's 80219 and IOP32X (XScale) family of
processors.
config ARCH_IOP33X
bool "IOP33x-based"
depends on MMU
select ARCH_REQUIRE_GPIOLIB
select CPU_XSCALE
select GPIO_IOP
select NEED_RET_TO_USER
select PCI
select PLAT_IOP
help
Support for Intel's IOP33X (XScale) family of processors.
config ARCH_IXP4XX
bool "IXP4xx-based"
depends on MMU
select ARCH_HAS_DMA_SET_COHERENT_MASK
select ARCH_REQUIRE_GPIOLIB
select ARCH_SUPPORTS_BIG_ENDIAN
select CLKSRC_MMIO
select CPU_XSCALE
select DMABOUNCE if PCI
select GENERIC_CLOCKEVENTS
select MIGHT_HAVE_PCI
select NEED_MACH_IO_H
select USB_EHCI_BIG_ENDIAN_DESC
select USB_EHCI_BIG_ENDIAN_MMIO
help
Support for Intel's IXP4XX (XScale) family of processors.
config ARCH_DOVE
bool "Marvell Dove"
select ARCH_REQUIRE_GPIOLIB
select CPU_PJ4
select GENERIC_CLOCKEVENTS
select MIGHT_HAVE_PCI
select MVEBU_MBUS
select PINCTRL
select PINCTRL_DOVE
select PLAT_ORION_LEGACY
help
Support for the Marvell Dove SoC 88AP510
config ARCH_MV78XX0
bool "Marvell MV78xx0"
select ARCH_REQUIRE_GPIOLIB
select CPU_FEROCEON
select GENERIC_CLOCKEVENTS
select MVEBU_MBUS
select PCI
select PLAT_ORION_LEGACY
help
Support for the following Marvell MV78xx0 series SoCs:
MV781x0, MV782x0.
config ARCH_ORION5X
bool "Marvell Orion"
depends on MMU
select ARCH_REQUIRE_GPIOLIB
select CPU_FEROCEON
select GENERIC_CLOCKEVENTS
select MVEBU_MBUS
select PCI
select PLAT_ORION_LEGACY
help
Support for the following Marvell Orion 5x series SoCs:
Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
Orion-2 (5281), Orion-1-90 (6183).
config ARCH_MMP
bool "Marvell PXA168/910/MMP2"
depends on MMU
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select GENERIC_ALLOCATOR
select GENERIC_CLOCKEVENTS
select GPIO_PXA
select IRQ_DOMAIN
select MULTI_IRQ_HANDLER
select PINCTRL
select PLAT_PXA
select SPARSE_IRQ
help
Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
config ARCH_KS8695
bool "Micrel/Kendin KS8695"
select ARCH_REQUIRE_GPIOLIB
select CLKSRC_MMIO
select CPU_ARM922T
select GENERIC_CLOCKEVENTS
select NEED_MACH_MEMORY_H
help
Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
System-on-Chip devices.
config ARCH_W90X900
bool "Nuvoton W90X900 CPU"
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select CPU_ARM926T
select GENERIC_CLOCKEVENTS
help
Support for Nuvoton (Winbond logic dept.) ARM9 processor,
At present, the w90x900 has been renamed nuc900, regarding
the ARM series product line, you can login the following
link address to know more.
<http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
config ARCH_LPC32XX
bool "NXP LPC32XX"
select ARCH_REQUIRE_GPIOLIB
select ARM_AMBA
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select CPU_ARM926T
select GENERIC_CLOCKEVENTS
select HAVE_IDE
select USE_OF
help
Support for the NXP LPC32XX family of processors
config ARCH_PXA
bool "PXA2xx/PXA3xx-based"
depends on MMU
select ARCH_MTD_XIP
select ARCH_REQUIRE_GPIOLIB
select ARM_CPU_SUSPEND if PM
select AUTO_ZRELADDR
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select CLKSRC_OF
select GENERIC_CLOCKEVENTS
select GPIO_PXA
select HAVE_IDE
select MULTI_IRQ_HANDLER
select PLAT_PXA
select SPARSE_IRQ
help
Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
config ARCH_MSM
bool "Qualcomm MSM (non-multiplatform)"
select ARCH_REQUIRE_GPIOLIB
select COMMON_CLK
select GENERIC_CLOCKEVENTS
help
Support for Qualcomm MSM/QSD based systems. This runs on the
apps processor of the MSM/QSD and depends on a shared memory
interface to the modem processor which runs the baseband
stack and controls some vital subsystems
(clock and power control, etc).
config ARCH_SHMOBILE_LEGACY
bool "Renesas ARM SoCs (non-multiplatform)"
select ARCH_SHMOBILE
select ARM_PATCH_PHYS_VIRT if MMU
select CLKDEV_LOOKUP
select CPU_V7
select GENERIC_CLOCKEVENTS
select HAVE_ARM_SCU if SMP
select HAVE_ARM_TWD if SMP
select HAVE_MACH_CLKDEV
select HAVE_SMP
select MIGHT_HAVE_CACHE_L2X0
select MULTI_IRQ_HANDLER
select NO_IOPORT_MAP
select PINCTRL
select PM_GENERIC_DOMAINS if PM
select SH_CLK_CPG
select SPARSE_IRQ
help
Support for Renesas ARM SoC platforms using a non-multiplatform
kernel. This includes the SH-Mobile, R-Mobile, EMMA-Mobile, R-Car
and RZ families.
config ARCH_RPC
bool "RiscPC"
select ARCH_ACORN
select ARCH_MAY_HAVE_PC_FDC
select ARCH_SPARSEMEM_ENABLE
select ARCH_USES_GETTIMEOFFSET
select CPU_SA110
select FIQ
select HAVE_IDE
select HAVE_PATA_PLATFORM
select ISA_DMA_API
select NEED_MACH_IO_H
select NEED_MACH_MEMORY_H
select NO_IOPORT_MAP
select VIRT_TO_BUS
help
On the Acorn Risc-PC, Linux can support the internal IDE disk and
CD-ROM interface, serial and parallel port, and the floppy drive.
config ARCH_SA1100
bool "SA1100-based"
select ARCH_MTD_XIP
select ARCH_REQUIRE_GPIOLIB
select ARCH_SPARSEMEM_ENABLE
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select CPU_FREQ
select CPU_SA1100
select GENERIC_CLOCKEVENTS
select HAVE_IDE
select ISA
select NEED_MACH_MEMORY_H
select SPARSE_IRQ
help
Support for StrongARM 11x0 based boards.
config ARCH_S3C24XX
bool "Samsung S3C24XX SoCs"
select ARCH_REQUIRE_GPIOLIB
select ATAGS
select CLKDEV_LOOKUP
select CLKSRC_SAMSUNG_PWM
select GENERIC_CLOCKEVENTS
select GPIO_SAMSUNG
select HAVE_S3C2410_I2C if I2C
select HAVE_S3C2410_WATCHDOG if WATCHDOG
select HAVE_S3C_RTC if RTC_CLASS
select MULTI_IRQ_HANDLER
select NEED_MACH_IO_H
select SAMSUNG_ATAGS
help
Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443
and S3C2450 SoCs based systems, such as the Simtec Electronics BAST
(<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or the
Samsung SMDK2410 development board (and derivatives).
config ARCH_S3C64XX
bool "Samsung S3C64XX"
select ARCH_REQUIRE_GPIOLIB
select ARM_AMBA
select ARM_VIC
select ATAGS
select CLKDEV_LOOKUP
select CLKSRC_SAMSUNG_PWM
select COMMON_CLK_SAMSUNG
select CPU_V6K
select GENERIC_CLOCKEVENTS
select GPIO_SAMSUNG
select HAVE_S3C2410_I2C if I2C
select HAVE_S3C2410_WATCHDOG if WATCHDOG
select HAVE_TCM
select NO_IOPORT_MAP
select PLAT_SAMSUNG
select PM_GENERIC_DOMAINS if PM
select S3C_DEV_NAND
select S3C_GPIO_TRACK
select SAMSUNG_ATAGS
select SAMSUNG_WAKEMASK
select SAMSUNG_WDT_RESET
help
Samsung S3C64XX series based systems
config ARCH_DAVINCI
bool "TI DaVinci"
select ARCH_HAS_HOLES_MEMORYMODEL
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select GENERIC_ALLOCATOR
select GENERIC_CLOCKEVENTS
select GENERIC_IRQ_CHIP
select HAVE_IDE
select TI_PRIV_EDMA
select USE_OF
select ZONE_DMA
help
Support for TI's DaVinci platform.
config ARCH_OMAP1
bool "TI OMAP1"
depends on MMU
select ARCH_HAS_HOLES_MEMORYMODEL
select ARCH_OMAP
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select CLKSRC_MMIO
select GENERIC_CLOCKEVENTS
select GENERIC_IRQ_CHIP
select HAVE_IDE
select IRQ_DOMAIN
select NEED_MACH_IO_H if PCCARD
select NEED_MACH_MEMORY_H
help
Support for older TI OMAP1 (omap7xx, omap15xx or omap16xx)
endchoice
menu "Multiple platform selection"
depends on ARCH_MULTIPLATFORM
comment "CPU Core family selection"
config ARCH_MULTI_V4
bool "ARMv4 based platforms (FA526)"
depends on !ARCH_MULTI_V6_V7
select ARCH_MULTI_V4_V5
select CPU_FA526
config ARCH_MULTI_V4T
bool "ARMv4T based platforms (ARM720T, ARM920T, ...)"
depends on !ARCH_MULTI_V6_V7
select ARCH_MULTI_V4_V5
select CPU_ARM920T if !(CPU_ARM7TDMI || CPU_ARM720T || \
CPU_ARM740T || CPU_ARM9TDMI || CPU_ARM922T || \
CPU_ARM925T || CPU_ARM940T)
config ARCH_MULTI_V5
bool "ARMv5 based platforms (ARM926T, XSCALE, PJ1, ...)"
depends on !ARCH_MULTI_V6_V7
select ARCH_MULTI_V4_V5
select CPU_ARM926T if !(CPU_ARM946E || CPU_ARM1020 || \
CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || \
CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_FEROCEON)
config ARCH_MULTI_V4_V5
bool
config ARCH_MULTI_V6
bool "ARMv6 based platforms (ARM11)"
select ARCH_MULTI_V6_V7
select CPU_V6K
config ARCH_MULTI_V7
bool "ARMv7 based platforms (Cortex-A, PJ4, Scorpion, Krait)"
default y
select ARCH_MULTI_V6_V7
select CPU_V7
select HAVE_SMP
config ARCH_MULTI_V6_V7
bool
select MIGHT_HAVE_CACHE_L2X0
config ARCH_MULTI_CPU_AUTO
def_bool !(ARCH_MULTI_V4 || ARCH_MULTI_V4T || ARCH_MULTI_V6_V7)
select ARCH_MULTI_V5
endmenu
config ARCH_VIRT
bool "Dummy Virtual Machine" if ARCH_MULTI_V7
select ARM_AMBA
select ARM_GIC
select ARM_PSCI
select HAVE_ARM_ARCH_TIMER
#
# This is sorted alphabetically by mach-* pathname. However, plat-*
# Kconfigs may be included either alphabetically (according to the
# plat- suffix) or along side the corresponding mach-* source.
#
source "arch/arm/mach-mvebu/Kconfig"
source "arch/arm/mach-asm9260/Kconfig"
source "arch/arm/mach-at91/Kconfig"
source "arch/arm/mach-axxia/Kconfig"
source "arch/arm/mach-bcm/Kconfig"
source "arch/arm/mach-berlin/Kconfig"
source "arch/arm/mach-clps711x/Kconfig"
source "arch/arm/mach-cns3xxx/Kconfig"
source "arch/arm/mach-davinci/Kconfig"
source "arch/arm/mach-dove/Kconfig"
source "arch/arm/mach-ep93xx/Kconfig"
source "arch/arm/mach-footbridge/Kconfig"
source "arch/arm/mach-gemini/Kconfig"
source "arch/arm/mach-highbank/Kconfig"
source "arch/arm/mach-hisi/Kconfig"
source "arch/arm/mach-integrator/Kconfig"
source "arch/arm/mach-iop32x/Kconfig"
source "arch/arm/mach-iop33x/Kconfig"
source "arch/arm/mach-iop13xx/Kconfig"
source "arch/arm/mach-ixp4xx/Kconfig"
source "arch/arm/mach-keystone/Kconfig"
source "arch/arm/mach-ks8695/Kconfig"
source "arch/arm/mach-meson/Kconfig"
source "arch/arm/mach-msm/Kconfig"
source "arch/arm/mach-moxart/Kconfig"
source "arch/arm/mach-mv78xx0/Kconfig"
source "arch/arm/mach-imx/Kconfig"
source "arch/arm/mach-mediatek/Kconfig"
source "arch/arm/mach-mxs/Kconfig"
source "arch/arm/mach-netx/Kconfig"
source "arch/arm/mach-nomadik/Kconfig"
source "arch/arm/mach-nspire/Kconfig"
source "arch/arm/plat-omap/Kconfig"
source "arch/arm/mach-omap1/Kconfig"
source "arch/arm/mach-omap2/Kconfig"
source "arch/arm/mach-orion5x/Kconfig"
source "arch/arm/mach-picoxcell/Kconfig"
source "arch/arm/mach-pxa/Kconfig"
source "arch/arm/plat-pxa/Kconfig"
source "arch/arm/mach-mmp/Kconfig"
source "arch/arm/mach-qcom/Kconfig"
source "arch/arm/mach-realview/Kconfig"
source "arch/arm/mach-rockchip/Kconfig"
source "arch/arm/mach-sa1100/Kconfig"
source "arch/arm/mach-socfpga/Kconfig"
source "arch/arm/mach-spear/Kconfig"
source "arch/arm/mach-sti/Kconfig"
source "arch/arm/mach-s3c24xx/Kconfig"
source "arch/arm/mach-s3c64xx/Kconfig"
source "arch/arm/mach-s5pv210/Kconfig"
source "arch/arm/mach-exynos/Kconfig"
source "arch/arm/plat-samsung/Kconfig"
source "arch/arm/mach-shmobile/Kconfig"
source "arch/arm/mach-sunxi/Kconfig"
source "arch/arm/mach-prima2/Kconfig"
source "arch/arm/mach-tegra/Kconfig"
source "arch/arm/mach-u300/Kconfig"
source "arch/arm/mach-ux500/Kconfig"
source "arch/arm/mach-versatile/Kconfig"
source "arch/arm/mach-vexpress/Kconfig"
source "arch/arm/plat-versatile/Kconfig"
source "arch/arm/mach-vt8500/Kconfig"
source "arch/arm/mach-w90x900/Kconfig"
source "arch/arm/mach-zynq/Kconfig"
# Definitions to make life easier
config ARCH_ACORN
bool
config PLAT_IOP
bool
select GENERIC_CLOCKEVENTS
config PLAT_ORION
bool
select CLKSRC_MMIO
select COMMON_CLK
select GENERIC_IRQ_CHIP
select IRQ_DOMAIN
config PLAT_ORION_LEGACY
bool
select PLAT_ORION
config PLAT_PXA
bool
config PLAT_VERSATILE
bool
config ARM_TIMER_SP804
bool
select CLKSRC_MMIO
select CLKSRC_OF if OF
source "arch/arm/firmware/Kconfig"
source arch/arm/mm/Kconfig
config IWMMXT
bool "Enable iWMMXt support"
depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK || CPU_PJ4 || CPU_PJ4B
default y if PXA27x || PXA3xx || ARCH_MMP || CPU_PJ4 || CPU_PJ4B
help
Enable support for iWMMXt context switching at run time if
running on a CPU that supports it.
config MULTI_IRQ_HANDLER
bool
help
Allow each machine to specify it's own IRQ handler at run time.
if !MMU
source "arch/arm/Kconfig-nommu"
endif
config PJ4B_ERRATA_4742
bool "PJ4B Errata 4742: IDLE Wake Up Commands can Cause the CPU Core to Cease Operation"
depends on CPU_PJ4B && MACH_ARMADA_370
default y
help
When coming out of either a Wait for Interrupt (WFI) or a Wait for
Event (WFE) IDLE states, a specific timing sensitivity exists between
the retiring WFI/WFE instructions and the newly issued subsequent
instructions. This sensitivity can result in a CPU hang scenario.
Workaround:
The software must insert either a Data Synchronization Barrier (DSB)
or Data Memory Barrier (DMB) command immediately after the WFI/WFE
instruction
config ARM_ERRATA_326103
bool "ARM errata: FSR write bit incorrect on a SWP to read-only memory"
depends on CPU_V6
help
Executing a SWP instruction to read-only memory does not set bit 11
of the FSR on the ARM 1136 prior to r1p0. This causes the kernel to
treat the access as a read, preventing a COW from occurring and
causing the faulting task to livelock.
config ARM_ERRATA_411920
bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
depends on CPU_V6 || CPU_V6K
help
Invalidation of the Instruction Cache operation can
fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
It does not affect the MPCore. This option enables the ARM Ltd.
recommended workaround.
config ARM_ERRATA_430973
bool "ARM errata: Stale prediction on replaced interworking branch"
depends on CPU_V7
help
This option enables the workaround for the 430973 Cortex-A8
(r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
interworking branch is replaced with another code sequence at the
same virtual address, whether due to self-modifying code or virtual
to physical address re-mapping, Cortex-A8 does not recover from the
stale interworking branch prediction. This results in Cortex-A8
executing the new code sequence in the incorrect ARM or Thumb state.
The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
and also flushes the branch target cache at every context switch.
Note that setting specific bits in the ACTLR register may not be
available in non-secure mode.
config ARM_ERRATA_458693
bool "ARM errata: Processor deadlock when a false hazard is created"
depends on CPU_V7
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 458693 Cortex-A8 (r2p0)
erratum. For very specific sequences of memory operations, it is
possible for a hazard condition intended for a cache line to instead
be incorrectly associated with a different cache line. This false
hazard might then cause a processor deadlock. The workaround enables
the L1 caching of the NEON accesses and disables the PLD instruction
in the ACTLR register. Note that setting specific bits in the ACTLR
register may not be available in non-secure mode.
config ARM_ERRATA_460075
bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
depends on CPU_V7
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 460075 Cortex-A8 (r2p0)
erratum. Any asynchronous access to the L2 cache may encounter a
situation in which recent store transactions to the L2 cache are lost
and overwritten with stale memory contents from external memory. The
workaround disables the write-allocate mode for the L2 cache via the
ACTLR register. Note that setting specific bits in the ACTLR register
may not be available in non-secure mode.
config ARM_ERRATA_742230
bool "ARM errata: DMB operation may be faulty"
depends on CPU_V7 && SMP
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 742230 Cortex-A9
(r1p0..r2p2) erratum. Under rare circumstances, a DMB instruction
between two write operations may not ensure the correct visibility
ordering of the two writes. This workaround sets a specific bit in
the diagnostic register of the Cortex-A9 which causes the DMB
instruction to behave as a DSB, ensuring the correct behaviour of
the two writes.
config ARM_ERRATA_742231
bool "ARM errata: Incorrect hazard handling in the SCU may lead to data corruption"
depends on CPU_V7 && SMP
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 742231 Cortex-A9
(r2p0..r2p2) erratum. Under certain conditions, specific to the
Cortex-A9 MPCore micro-architecture, two CPUs working in SMP mode,
accessing some data located in the same cache line, may get corrupted
data due to bad handling of the address hazard when the line gets
replaced from one of the CPUs at the same time as another CPU is
accessing it. This workaround sets specific bits in the diagnostic
register of the Cortex-A9 which reduces the linefill issuing
capabilities of the processor.
config ARM_ERRATA_643719
bool "ARM errata: LoUIS bit field in CLIDR register is incorrect"
depends on CPU_V7 && SMP
help
This option enables the workaround for the 643719 Cortex-A9 (prior to
r1p0) erratum. On affected cores the LoUIS bit field of the CLIDR
register returns zero when it should return one. The workaround
corrects this value, ensuring cache maintenance operations which use
it behave as intended and avoiding data corruption.
config ARM_ERRATA_720789
bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
depends on CPU_V7
help
This option enables the workaround for the 720789 Cortex-A9 (prior to
r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
As a consequence of this erratum, some TLB entries which should be
invalidated are not, resulting in an incoherency in the system page
tables. The workaround changes the TLB flushing routines to invalidate
entries regardless of the ASID.
config ARM_ERRATA_743622
bool "ARM errata: Faulty hazard checking in the Store Buffer may lead to data corruption"
depends on CPU_V7
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 743622 Cortex-A9
(r2p*) erratum. Under very rare conditions, a faulty
optimisation in the Cortex-A9 Store Buffer may lead to data
corruption. This workaround sets a specific bit in the diagnostic
register of the Cortex-A9 which disables the Store Buffer
optimisation, preventing the defect from occurring. This has no
visible impact on the overall performance or power consumption of the
processor.
config ARM_ERRATA_751472
bool "ARM errata: Interrupted ICIALLUIS may prevent completion of broadcasted operation"
depends on CPU_V7
depends on !ARCH_MULTIPLATFORM
help
This option enables the workaround for the 751472 Cortex-A9 (prior
to r3p0) erratum. An interrupted ICIALLUIS operation may prevent the
completion of a following broadcasted operation if the second
operation is received by a CPU before the ICIALLUIS has completed,
potentially leading to corrupted entries in the cache or TLB.
config ARM_ERRATA_754322
bool "ARM errata: possible faulty MMU translations following an ASID switch"
depends on CPU_V7
help
This option enables the workaround for the 754322 Cortex-A9 (r2p*,
r3p*) erratum. A speculative memory access may cause a page table walk
which starts prior to an ASID switch but completes afterwards. This
can populate the micro-TLB with a stale entry which may be hit with
the new ASID. This workaround places two dsb instructions in the mm
switching code so that no page table walks can cross the ASID switch.
config ARM_ERRATA_754327
bool "ARM errata: no automatic Store Buffer drain"
depends on CPU_V7 && SMP
help
This option enables the workaround for the 754327 Cortex-A9 (prior to
r2p0) erratum. The Store Buffer does not have any automatic draining
mechanism and therefore a livelock may occur if an external agent
continuously polls a memory location waiting to observe an update.
This workaround defines cpu_relax() as smp_mb(), preventing correctly
written polling loops from denying visibility of updates to memory.
config ARM_ERRATA_364296
bool "ARM errata: Possible cache data corruption with hit-under-miss enabled"
depends on CPU_V6
help
This options enables the workaround for the 364296 ARM1136
r0p2 erratum (possible cache data corruption with
hit-under-miss enabled). It sets the undocumented bit 31 in
the auxiliary control register and the FI bit in the control
register, thus disabling hit-under-miss without putting the
processor into full low interrupt latency mode. ARM11MPCore
is not affected.
config ARM_ERRATA_764369
bool "ARM errata: Data cache line maintenance operation by MVA may not succeed"
depends on CPU_V7 && SMP
help
This option enables the workaround for erratum 764369
affecting Cortex-A9 MPCore with two or more processors (all
current revisions). Under certain timing circumstances, a data
cache line maintenance operation by MVA targeting an Inner
Shareable memory region may fail to proceed up to either the
Point of Coherency or to the Point of Unification of the
system. This workaround adds a DSB instruction before the
relevant cache maintenance functions and sets a specific bit
in the diagnostic control register of the SCU.
config ARM_ERRATA_775420
bool "ARM errata: A data cache maintenance operation which aborts, might lead to deadlock"
depends on CPU_V7
help
This option enables the workaround for the 775420 Cortex-A9 (r2p2,
r2p6,r2p8,r2p10,r3p0) erratum. In case a date cache maintenance
operation aborts with MMU exception, it might cause the processor
to deadlock. This workaround puts DSB before executing ISB if
an abort may occur on cache maintenance.
config ARM_ERRATA_798181
bool "ARM errata: TLBI/DSB failure on Cortex-A15"
depends on CPU_V7 && SMP
help
On Cortex-A15 (r0p0..r3p2) the TLBI*IS/DSB operations are not
adequately shooting down all use of the old entries. This
option enables the Linux kernel workaround for this erratum
which sends an IPI to the CPUs that are running the same ASID
as the one being invalidated.
config ARM_ERRATA_773022
bool "ARM errata: incorrect instructions may be executed from loop buffer"
depends on CPU_V7
help
This option enables the workaround for the 773022 Cortex-A15
(up to r0p4) erratum. In certain rare sequences of code, the
loop buffer may deliver incorrect instructions. This
workaround disables the loop buffer to avoid the erratum.
endmenu
source "arch/arm/common/Kconfig"
menu "Bus support"
config ISA
bool
help
Find out whether you have ISA slots on your motherboard. ISA is the
name of a bus system, i.e. the way the CPU talks to the other stuff
inside your box. Other bus systems are PCI, EISA, MicroChannel
(MCA) or VESA. ISA is an older system, now being displaced by PCI;
newer boards don't support it. If you have ISA, say Y, otherwise N.
# Select ISA DMA controller support
config ISA_DMA
bool
select ISA_DMA_API
# Select ISA DMA interface
config ISA_DMA_API
bool
config PCI
bool "PCI support" if MIGHT_HAVE_PCI
help
Find out whether you have a PCI motherboard. PCI is the name of a
bus system, i.e. the way the CPU talks to the other stuff inside
your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
VESA. If you have PCI, say Y, otherwise N.
config PCI_DOMAINS
bool
depends on PCI
config PCI_NANOENGINE
bool "BSE nanoEngine PCI support"
depends on SA1100_NANOENGINE
help
Enable PCI on the BSE nanoEngine board.
config PCI_SYSCALL
def_bool PCI
config PCI_HOST_ITE8152
bool
depends on PCI && MACH_ARMCORE
default y
select DMABOUNCE
source "drivers/pci/Kconfig"
source "drivers/pci/pcie/Kconfig"
source "drivers/pcmcia/Kconfig"
endmenu
menu "Kernel Features"
config HAVE_SMP
bool
help
This option should be selected by machines which have an SMP-
capable CPU.
The only effect of this option is to make the SMP-related
options available to the user for configuration.
config SMP
bool "Symmetric Multi-Processing"
depends on CPU_V6K || CPU_V7
depends on GENERIC_CLOCKEVENTS
depends on HAVE_SMP
depends on MMU || ARM_MPU
help
This enables support for systems with more than one CPU. If you have
a system with only one CPU, say N. If you have a system with more
than one CPU, say Y.
If you say N here, the kernel will run on uni- and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on many, but not all,
uniprocessor machines. On a uniprocessor machine, the kernel
will run faster if you say N here.
See also <file:Documentation/x86/i386/IO-APIC.txt>,
<file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
<http://tldp.org/HOWTO/SMP-HOWTO.html>.
If you don't know what to do here, say N.
config SMP_ON_UP
bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
depends on SMP && !XIP_KERNEL && MMU
default y
help
SMP kernels contain instructions which fail on non-SMP processors.
Enabling this option allows the kernel to modify itself to make
these instructions safe. Disabling it allows about 1K of space
savings.
If you don't know what to do here, say Y.
config ARM_CPU_TOPOLOGY
bool "Support cpu topology definition"
depends on SMP && CPU_V7
default y
help
Support ARM cpu topology definition. The MPIDR register defines
affinity between processors which is then used to describe the cpu
topology of an ARM System.
config SCHED_MC
bool "Multi-core scheduler support"
depends on ARM_CPU_TOPOLOGY
help
Multi-core scheduler support improves the CPU scheduler's decision
making when dealing with multi-core CPU chips at a cost of slightly
increased overhead in some places. If unsure say N here.
config SCHED_SMT
bool "SMT scheduler support"
depends on ARM_CPU_TOPOLOGY
help
Improves the CPU scheduler's decision making when dealing with
MultiThreading at a cost of slightly increased overhead in some
places. If unsure say N here.
config HAVE_ARM_SCU
bool
help
This option enables support for the ARM system coherency unit
config HAVE_ARM_ARCH_TIMER
bool "Architected timer support"
depends on CPU_V7
select ARM_ARCH_TIMER
select GENERIC_CLOCKEVENTS
help
This option enables support for the ARM architected timer
config HAVE_ARM_TWD
bool
depends on SMP
select CLKSRC_OF if OF
help
This options enables support for the ARM timer and watchdog unit
config MCPM
bool "Multi-Cluster Power Management"
depends on CPU_V7 && SMP
help
This option provides the common power management infrastructure
for (multi-)cluster based systems, such as big.LITTLE based
systems.
config MCPM_QUAD_CLUSTER
bool
depends on MCPM
help
To avoid wasting resources unnecessarily, MCPM only supports up
to 2 clusters by default.
Platforms with 3 or 4 clusters that use MCPM must select this
option to allow the additional clusters to be managed.
config BIG_LITTLE
bool "big.LITTLE support (Experimental)"
depends on CPU_V7 && SMP
select MCPM
help
This option enables support selections for the big.LITTLE
system architecture.
config BL_SWITCHER
bool "big.LITTLE switcher support"
depends on BIG_LITTLE && MCPM && HOTPLUG_CPU
select ARM_CPU_SUSPEND
select CPU_PM
help
The big.LITTLE "switcher" provides the core functionality to
transparently handle transition between a cluster of A15's
and a cluster of A7's in a big.LITTLE system.
config BL_SWITCHER_DUMMY_IF
tristate "Simple big.LITTLE switcher user interface"
depends on BL_SWITCHER && DEBUG_KERNEL
help
This is a simple and dummy char dev interface to control
the big.LITTLE switcher core code. It is meant for
debugging purposes only.
choice
prompt "Memory split"
depends on MMU
default VMSPLIT_3G
help
Select the desired split between kernel and user memory.
If you are not absolutely sure what you are doing, leave this
option alone!
config VMSPLIT_3G
bool "3G/1G user/kernel split"
config VMSPLIT_2G
bool "2G/2G user/kernel split"
config VMSPLIT_1G
bool "1G/3G user/kernel split"
endchoice
config PAGE_OFFSET
hex
default PHYS_OFFSET if !MMU
default 0x40000000 if VMSPLIT_1G
default 0x80000000 if VMSPLIT_2G
default 0xC0000000
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "4"
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
help
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu.
config ARM_PSCI
bool "Support for the ARM Power State Coordination Interface (PSCI)"
depends on CPU_V7
help
Say Y here if you want Linux to communicate with system firmware
implementing the PSCI specification for CPU-centric power
management operations described in ARM document number ARM DEN
0022A ("Power State Coordination Interface System Software on
ARM processors").
# The GPIO number here must be sorted by descending number. In case of
# a multiplatform kernel, we just want the highest value required by the
# selected platforms.
config ARCH_NR_GPIO
int
default 1024 if ARCH_SHMOBILE || ARCH_TEGRA
default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \
SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210
default 416 if ARCH_SUNXI
default 392 if ARCH_U8500
default 352 if ARCH_VT8500
default 288 if ARCH_ROCKCHIP
default 264 if MACH_H4700
default 0
help
Maximum number of GPIOs in the system.
If unsure, leave the default value.
source kernel/Kconfig.preempt
config HZ_FIXED
int
default 200 if ARCH_EBSA110 || ARCH_S3C24XX || \
ARCH_S5PV210 || ARCH_EXYNOS4
default AT91_TIMER_HZ if ARCH_AT91
default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE_LEGACY
default 0
choice
depends on HZ_FIXED = 0
prompt "Timer frequency"
config HZ_100
bool "100 Hz"
config HZ_200
bool "200 Hz"
config HZ_250
bool "250 Hz"
config HZ_300
bool "300 Hz"
config HZ_500
bool "500 Hz"
config HZ_1000
bool "1000 Hz"
endchoice
config HZ
int
default HZ_FIXED if HZ_FIXED != 0
default 100 if HZ_100
default 200 if HZ_200
default 250 if HZ_250
default 300 if HZ_300
default 500 if HZ_500
default 1000
config SCHED_HRTICK
def_bool HIGH_RES_TIMERS
config THUMB2_KERNEL
bool "Compile the kernel in Thumb-2 mode" if !CPU_THUMBONLY
depends on (CPU_V7 || CPU_V7M) && !CPU_V6 && !CPU_V6K
default y if CPU_THUMBONLY
select AEABI
select ARM_ASM_UNIFIED
select ARM_UNWIND
help
By enabling this option, the kernel will be compiled in
Thumb-2 mode. A compiler/assembler that understand the unified
ARM-Thumb syntax is needed.
If unsure, say N.
config THUMB2_AVOID_R_ARM_THM_JUMP11
bool "Work around buggy Thumb-2 short branch relocations in gas"
depends on THUMB2_KERNEL && MODULES
default y
help
Various binutils versions can resolve Thumb-2 branches to
locally-defined, preemptible global symbols as short-range "b.n"
branch instructions.
This is a problem, because there's no guarantee the final
destination of the symbol, or any candidate locations for a
trampoline, are within range of the branch. For this reason, the
kernel does not support fixing up the R_ARM_THM_JUMP11 (102)
relocation in modules at all, and it makes little sense to add
support.
The symptom is that the kernel fails with an "unsupported
relocation" error when loading some modules.
Until fixed tools are available, passing
-fno-optimize-sibling-calls to gcc should prevent gcc generating
code which hits this problem, at the cost of a bit of extra runtime
stack usage in some cases.
The problem is described in more detail at:
https://bugs.launchpad.net/binutils-linaro/+bug/725126
Only Thumb-2 kernels are affected.
Unless you are sure your tools don't have this problem, say Y.
config ARM_ASM_UNIFIED
bool
config AEABI
bool "Use the ARM EABI to compile the kernel"
help
This option allows for the kernel to be compiled using the latest
ARM ABI (aka EABI). This is only useful if you are using a user
space environment that is also compiled with EABI.
Since there are major incompatibilities between the legacy ABI and
EABI, especially with regard to structure member alignment, this
option also changes the kernel syscall calling convention to
disambiguate both ABIs and allow for backward compatibility support
(selected with CONFIG_OABI_COMPAT).
To use this you need GCC version 4.0.0 or later.
config OABI_COMPAT
bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
depends on AEABI && !THUMB2_KERNEL
help
This option preserves the old syscall interface along with the
new (ARM EABI) one. It also provides a compatibility layer to
intercept syscalls that have structure arguments which layout
in memory differs between the legacy ABI and the new ARM EABI
(only for non "thumb" binaries). This option adds a tiny
overhead to all syscalls and produces a slightly larger kernel.
The seccomp filter system will not be available when this is
selected, since there is no way yet to sensibly distinguish
between calling conventions during filtering.
If you know you'll be using only pure EABI user space then you
can say N here. If this option is not selected and you attempt
to execute a legacy ABI binary then the result will be
UNPREDICTABLE (in fact it can be predicted that it won't work
at all). If in doubt say N.
config ARCH_HAS_HOLES_MEMORYMODEL
bool
config ARCH_SPARSEMEM_ENABLE
bool
config ARCH_SPARSEMEM_DEFAULT
def_bool ARCH_SPARSEMEM_ENABLE
config ARCH_SELECT_MEMORY_MODEL
def_bool ARCH_SPARSEMEM_ENABLE
config HAVE_ARCH_PFN_VALID
def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
config HAVE_GENERIC_RCU_GUP
def_bool y
depends on ARM_LPAE
config HIGHMEM
bool "High Memory Support"
depends on MMU
help
The address space of ARM processors is only 4 Gigabytes large
and it has to accommodate user address space, kernel address
space as well as some memory mapped IO. That means that, if you
have a large amount of physical memory and/or IO, not all of the
memory can be "permanently mapped" by the kernel. The physical
memory that is not permanently mapped is called "high memory".
Depending on the selected kernel/user memory split, minimum
vmalloc space and actual amount of RAM, you may not need this
option which should result in a slightly faster kernel.
If unsure, say n.
config HIGHPTE
bool "Allocate 2nd-level pagetables from highmem"
depends on HIGHMEM
config HW_PERF_EVENTS
bool "Enable hardware performance counter support for perf events"
depends on PERF_EVENTS
default y
help
Enable hardware performance counter support for perf events. If
disabled, perf events will use software events only.
config SYS_SUPPORTS_HUGETLBFS
def_bool y
depends on ARM_LPAE
config HAVE_ARCH_TRANSPARENT_HUGEPAGE
def_bool y
depends on ARM_LPAE
config ARCH_WANT_GENERAL_HUGETLB
def_bool y
source "mm/Kconfig"
config FORCE_MAX_ZONEORDER
int "Maximum zone order" if ARCH_SHMOBILE_LEGACY
range 11 64 if ARCH_SHMOBILE_LEGACY
default "12" if SOC_AM33XX
default "9" if SA1111 || ARCH_EFM32
default "11"
help
The kernel memory allocator divides physically contiguous memory
blocks into "zones", where each zone is a power of two number of
pages. This option selects the largest power of two that the kernel
keeps in the memory allocator. If you need to allocate very large
blocks of physically contiguous memory, then you may need to
increase this value.
This config option is actually maximum order plus one. For example,
a value of 11 means that the largest free memory block is 2^10 pages.
config ALIGNMENT_TRAP
bool
depends on CPU_CP15_MMU
default y if !ARCH_EBSA110
select HAVE_PROC_CPU if PROC_FS
help
ARM processors cannot fetch/store information which is not
naturally aligned on the bus, i.e., a 4 byte fetch must start at an
address divisible by 4. On 32-bit ARM processors, these non-aligned
fetch/store instructions will be emulated in software if you say
here, which has a severe performance impact. This is necessary for
correct operation of some network protocols. With an IP-only
configuration it is safe to say N, otherwise say Y.
config UACCESS_WITH_MEMCPY
bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user()"
depends on MMU
default y if CPU_FEROCEON
help
Implement faster copy_to_user and clear_user methods for CPU
cores where a 8-word STM instruction give significantly higher
memory write throughput than a sequence of individual 32bit stores.
A possible side effect is a slight increase in scheduling latency
between threads sharing the same address space if they invoke
such copy operations with large buffers.
However, if the CPU data cache is using a write-allocate mode,
this option is unlikely to provide any performance gain.
config SECCOMP
bool
prompt "Enable seccomp to safely compute untrusted bytecode"
---help---
This kernel feature is useful for number crunching applications
that may need to compute untrusted bytecode during their
execution. By using pipes or other transports made available to
the process as file descriptors supporting the read/write
syscalls, it's possible to isolate those applications in
their own address space using seccomp. Once seccomp is
enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
config SWIOTLB
def_bool y
config IOMMU_HELPER
def_bool SWIOTLB
config XEN_DOM0
def_bool y
depends on XEN
config XEN
bool "Xen guest support on ARM"
depends on ARM && AEABI && OF
depends on CPU_V7 && !CPU_V6
depends on !GENERIC_ATOMIC64
depends on MMU
select ARCH_DMA_ADDR_T_64BIT
select ARM_PSCI
select SWIOTLB_XEN
help
Say Y if you want to run Linux in a Virtual Machine on Xen on ARM.
endmenu
menu "Boot options"
config USE_OF
bool "Flattened Device Tree support"
select IRQ_DOMAIN
select OF
select OF_EARLY_FLATTREE
select OF_RESERVED_MEM
help
Include support for flattened device tree machine descriptions.
config ATAGS
bool "Support for the traditional ATAGS boot data passing" if USE_OF
default y
help
This is the traditional way of passing data to the kernel at boot
time. If you are solely relying on the flattened device tree (or
the ARM_ATAG_DTB_COMPAT option) then you may unselect this option
to remove ATAGS support from your kernel binary. If unsure,
leave this to y.
config DEPRECATED_PARAM_STRUCT
bool "Provide old way to pass kernel parameters"
depends on ATAGS
help
This was deprecated in 2001 and announced to live on for 5 years.
Some old boot loaders still use this way.
# Compressed boot loader in ROM. Yes, we really want to ask about
# TEXT and BSS so we preserve their values in the config files.
config ZBOOT_ROM_TEXT
hex "Compressed ROM boot loader base address"
default "0"
help
The physical address at which the ROM-able zImage is to be
placed in the target. Platforms which normally make use of
ROM-able zImage formats normally set this to a suitable
value in their defconfig file.
If ZBOOT_ROM is not enabled, this has no effect.
config ZBOOT_ROM_BSS
hex "Compressed ROM boot loader BSS address"
default "0"
help
The base address of an area of read/write memory in the target
for the ROM-able zImage which must be available while the
decompressor is running. It must be large enough to hold the
entire decompressed kernel plus an additional 128 KiB.
Platforms which normally make use of ROM-able zImage formats
normally set this to a suitable value in their defconfig file.
If ZBOOT_ROM is not enabled, this has no effect.
config ZBOOT_ROM
bool "Compressed boot loader in ROM/flash"
depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
depends on !ARM_APPENDED_DTB && !XIP_KERNEL && !AUTO_ZRELADDR
help
Say Y here if you intend to execute your compressed kernel image
(zImage) directly from ROM or flash. If unsure, say N.
choice
prompt "Include SD/MMC loader in zImage (EXPERIMENTAL)"
depends on ZBOOT_ROM && ARCH_SH7372
default ZBOOT_ROM_NONE
help
Include experimental SD/MMC loading code in the ROM-able zImage.
With this enabled it is possible to write the ROM-able zImage
kernel image to an MMC or SD card and boot the kernel straight
from the reset vector. At reset the processor Mask ROM will load
the first part of the ROM-able zImage which in turn loads the
rest the kernel image to RAM.
config ZBOOT_ROM_NONE
bool "No SD/MMC loader in zImage (EXPERIMENTAL)"
help
Do not load image from SD or MMC
config ZBOOT_ROM_MMCIF
bool "Include MMCIF loader in zImage (EXPERIMENTAL)"
help
Load image from MMCIF hardware block.
config ZBOOT_ROM_SH_MOBILE_SDHI
bool "Include SuperH Mobile SDHI loader in zImage (EXPERIMENTAL)"
help
Load image from SDHI hardware block
endchoice
config ARM_APPENDED_DTB
bool "Use appended device tree blob to zImage (EXPERIMENTAL)"
depends on OF
help
With this option, the boot code will look for a device tree binary
(DTB) appended to zImage
(e.g. cat zImage <filename>.dtb > zImage_w_dtb).
This is meant as a backward compatibility convenience for those
systems with a bootloader that can't be upgraded to accommodate
the documented boot protocol using a device tree.
Beware that there is very little in terms of protection against
this option being confused by leftover garbage in memory that might
look like a DTB header after a reboot if no actual DTB is appended
to zImage. Do not leave this option active in a production kernel
if you don't intend to always append a DTB. Proper passing of the
location into r2 of a bootloader provided DTB is always preferable
to this option.
config ARM_ATAG_DTB_COMPAT
bool "Supplement the appended DTB with traditional ATAG information"
depends on ARM_APPENDED_DTB
help
Some old bootloaders can't be updated to a DTB capable one, yet
they provide ATAGs with memory configuration, the ramdisk address,
the kernel cmdline string, etc. Such information is dynamically
provided by the bootloader and can't always be stored in a static
DTB. To allow a device tree enabled kernel to be used with such
bootloaders, this option allows zImage to extract the information
from the ATAG list and store it at run time into the appended DTB.
choice
prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
bool "Use bootloader kernel arguments if available"
help
Uses the command-line options passed by the boot loader instead of
the device tree bootargs property. If the boot loader doesn't provide
any, the device tree bootargs property will be used.
config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND
bool "Extend with bootloader kernel arguments"
help
The command-line arguments provided by the boot loader will be
appended to the the device tree bootargs property.
endchoice
config CMDLINE
string "Default kernel command string"
default ""
help
On some architectures (EBSA110 and CATS), there is currently no way
for the boot loader to pass arguments to the kernel. For these
architectures, you should supply some command-line options at build
time by entering them here. As a minimum, you should specify the
memory size and the root device (e.g., mem=64M root=/dev/nfs).
choice
prompt "Kernel command line type" if CMDLINE != ""
default CMDLINE_FROM_BOOTLOADER
depends on ATAGS
config CMDLINE_FROM_BOOTLOADER
bool "Use bootloader kernel arguments if available"
help
Uses the command-line options passed by the boot loader. If
the boot loader doesn't provide any, the default kernel command
string provided in CMDLINE will be used.
config CMDLINE_EXTEND
bool "Extend bootloader kernel arguments"
help
The command-line arguments provided by the boot loader will be
appended to the default kernel command string.
config CMDLINE_FORCE
bool "Always use the default kernel command string"
help
Always use the default kernel command string, even if the boot
loader passes other arguments to the kernel.
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
endchoice
config XIP_KERNEL
bool "Kernel Execute-In-Place from ROM"
depends on !ARM_LPAE && !ARCH_MULTIPLATFORM
help
Execute-In-Place allows the kernel to run from non-volatile storage
directly addressable by the CPU, such as NOR flash. This saves RAM
space since the text section of the kernel is not loaded from flash
to RAM. Read-write sections, such as the data section and stack,
are still copied to RAM. The XIP kernel is not compressed since
it has to run directly from flash, so it will take more space to
store it. The flash address used to link the kernel object files,
and for storing it, is configuration dependent. Therefore, if you
say Y here, you must know the proper physical address where to
store the kernel image depending on your own flash memory usage.
Also note that the make target becomes "make xipImage" rather than
"make zImage" or "make Image". The final kernel binary to put in
ROM memory will be arch/arm/boot/xipImage.
If unsure, say N.
config XIP_PHYS_ADDR
hex "XIP Kernel Physical Location"
depends on XIP_KERNEL
default "0x00080000"
help
This is the physical address in your flash memory the kernel will
be linked for and stored to. This address is dependent on your
own flash usage.
config KEXEC
bool "Kexec system call (EXPERIMENTAL)"
depends on (!SMP || PM_SLEEP_SMP)
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
It is an ongoing process to be certain the hardware in a machine
is properly shutdown, so do not be surprised if this code does not
initially work for you.
config ATAGS_PROC
bool "Export atags in procfs"
depends on ATAGS && KEXEC
default y
help
Should the atags used to boot the kernel be exported in an "atags"
file in procfs. Useful with kexec.
config CRASH_DUMP
bool "Build kdump crash kernel (EXPERIMENTAL)"
help
Generate crash dump after being started by kexec. This should
be normally only set in special crash dump kernels which are
loaded in the main kernel with kexec-tools into a specially
reserved region and then later executed after a crash by
kdump/kexec. The crash dump kernel must be compiled to a
memory address not used by the main kernel
For more details see Documentation/kdump/kdump.txt
config AUTO_ZRELADDR
bool "Auto calculation of the decompressed kernel image address"
help
ZRELADDR is the physical address where the decompressed kernel
image will be placed. If AUTO_ZRELADDR is selected, the address
will be determined at run-time by masking the current IP with
0xf8000000. This assumes the zImage being placed in the first 128MB
from start of memory.
endmenu
menu "CPU Power Management"
source "drivers/cpufreq/Kconfig"
source "drivers/cpuidle/Kconfig"
endmenu
menu "Floating point emulation"
comment "At least one emulation must be selected"
config FPE_NWFPE
bool "NWFPE math emulation"
depends on (!AEABI || OABI_COMPAT) && !THUMB2_KERNEL
---help---
Say Y to include the NWFPE floating point emulator in the kernel.
This is necessary to run most binaries. Linux does not currently
support floating point hardware so you need to say Y here even if
your machine has an FPA or floating point co-processor podule.
You may say N here if you are going to load the Acorn FPEmulator
early in the bootup.
config FPE_NWFPE_XP
bool "Support extended precision"
depends on FPE_NWFPE
help
Say Y to include 80-bit support in the kernel floating-point
emulator. Otherwise, only 32 and 64-bit support is compiled in.
Note that gcc does not generate 80-bit operations by default,
so in most cases this option only enlarges the size of the
floating point emulator without any good reason.
You almost surely want to say N here.
config FPE_FASTFPE
bool "FastFPE math emulation (EXPERIMENTAL)"
depends on (!AEABI || OABI_COMPAT) && !CPU_32v3
---help---
Say Y here to include the FAST floating point emulator in the kernel.
This is an experimental much faster emulator which now also has full
precision for the mantissa. It does not support any exceptions.
It is very simple, and approximately 3-6 times faster than NWFPE.
It should be sufficient for most programs. It may be not suitable
for scientific calculations, but you have to check this for yourself.
If you do not feel you need a faster FP emulation you should better
choose NWFPE.
config VFP
bool "VFP-format floating point maths"
depends on CPU_V6 || CPU_V6K || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
help
Say Y to include VFP support code in the kernel. This is needed
if your hardware includes a VFP unit.
Please see <file:Documentation/arm/VFP/release-notes.txt> for
release notes and additional status information.
Say N if your target does not have VFP hardware.
config VFPv3
bool
depends on VFP
default y if CPU_V7
config NEON
bool "Advanced SIMD (NEON) Extension support"
depends on VFPv3 && CPU_V7
help
Say Y to include support code for NEON, the ARMv7 Advanced SIMD
Extension.
config KERNEL_MODE_NEON
bool "Support for NEON in kernel mode"
depends on NEON && AEABI
help
Say Y to include support for NEON in kernel mode.
endmenu
menu "Userspace binary formats"
source "fs/Kconfig.binfmt"
config ARTHUR
tristate "RISC OS personality"
depends on !AEABI
help
Say Y here to include the kernel code necessary if you want to run
Acorn RISC OS/Arthur binaries under Linux. This code is still very
experimental; if this sounds frightening, say N and sleep in peace.
You can also say M here to compile this support as a module (which
will be called arthur).
endmenu
menu "Power management options"
source "kernel/power/Kconfig"
config ARCH_SUSPEND_POSSIBLE
depends on CPU_ARM920T || CPU_ARM926T || CPU_FEROCEON || CPU_SA1100 || \
CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M || CPU_XSC3 || CPU_XSCALE || CPU_MOHAWK
def_bool y
config ARM_CPU_SUSPEND
def_bool PM_SLEEP
config ARCH_HIBERNATION_POSSIBLE
bool
depends on MMU
default y if ARCH_SUSPEND_POSSIBLE
endmenu
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/arm/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
source "arch/arm/kvm/Kconfig"
|