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| author | Michal Marek <mmarek@suse.cz> | 2010-10-12 17:09:06 +0400 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-10-12 17:09:06 +0400 |
| commit | 239060b93bb30a4ad55f1ecaa512464a035cc5ba (patch) | |
| tree | 77f79810e57d4fc24356eca0cd6db463e8994128 /arch/mips/bcm47xx/prom.c | |
| parent | 1408b15b98635a13bad2e2a50b3c2ae2ccdf625b (diff) | |
| parent | e9203c988234aa512bd45ca32b52e21c7bbfc414 (diff) | |
| download | linux-239060b93bb30a4ad55f1ecaa512464a035cc5ba.tar.xz | |
Merge branch 'kbuild/rc-fixes' into kbuild/kconfig
We need to revert the temporary hack in 71ebc01, hence the merge.
Diffstat (limited to 'arch/mips/bcm47xx/prom.c')
| -rw-r--r-- | arch/mips/bcm47xx/prom.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c index 0fa646c5a844..f6e9063cc4c2 100644 --- a/arch/mips/bcm47xx/prom.c +++ b/arch/mips/bcm47xx/prom.c @@ -126,6 +126,7 @@ static __init void prom_init_cmdline(void) static __init void prom_init_mem(void) { unsigned long mem; + unsigned long max; /* Figure out memory size by finding aliases. * @@ -134,21 +135,26 @@ static __init void prom_init_mem(void) * want to reuse the memory used by CFE (around 4MB). That means cfe_* * functions stop to work at some point during the boot, we should only * call them at the beginning of the boot. + * + * BCM47XX uses 128MB for addressing the ram, if the system contains + * less that that amount of ram it remaps the ram more often into the + * available space. + * Accessing memory after 128MB will cause an exception. + * max contains the biggest possible address supported by the platform. + * If the method wants to try something above we assume 128MB ram. */ + max = ((unsigned long)(prom_init) | ((128 << 20) - 1)); for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { + if (((unsigned long)(prom_init) + mem) > max) { + mem = (128 << 20); + printk(KERN_DEBUG "assume 128MB RAM\n"); + break; + } if (*(unsigned long *)((unsigned long)(prom_init) + mem) == *(unsigned long *)(prom_init)) break; } - /* Ignoring the last page when ddr size is 128M. Cached - * accesses to last page is causing the processor to prefetch - * using address above 128M stepping out of the ddr address - * space. - */ - if (mem == 0x8000000) - mem -= 0x1000; - add_memory_region(0, mem, BOOT_MEM_RAM); } |