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authorHauke Mehrtens <hauke@hauke-m.de>2012-10-03 15:34:17 +0400
committerJohn Crispin <blogic@openwrt.org>2012-11-09 14:37:17 +0400
commitc47cc20ca53e792938556aa29103fa889ce0d858 (patch)
tree55182513e1ffc244339cc41ba5513519bc095d1c /arch
parentd3dce3d676373b1519546721ee5f3a8c613f40f5 (diff)
downloadlinux-c47cc20ca53e792938556aa29103fa889ce0d858.tar.xz
MIPS: BCM47XX: improve memory size detection
The memory size is detected by finding a place where it repeats in memory. Currently we are just checking when the function prom_init is seen again, but it is better to check for a bigger part of the memory to decrease the chance of wrong results. This should fix a problem we saw in OpenWrt, where the detected available memory decreed on some devices when doing a soft reboot. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Patchwork: http://patchwork.linux-mips.org/patch/4362 Signed-off-by: John Crispin <blogic@openwrt.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/bcm47xx/prom.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c
index 22258a4c652b..8c155afb1299 100644
--- a/arch/mips/bcm47xx/prom.c
+++ b/arch/mips/bcm47xx/prom.c
@@ -1,6 +1,7 @@
/*
* Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
* Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
+ * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -128,6 +129,7 @@ static __init void prom_init_mem(void)
{
unsigned long mem;
unsigned long max;
+ unsigned long off;
struct cpuinfo_mips *c = &current_cpu_data;
/* Figure out memory size by finding aliases.
@@ -145,15 +147,15 @@ static __init void prom_init_mem(void)
* 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));
+ off = (unsigned long)prom_init;
+ max = off | ((128 << 20) - 1);
for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
- if (((unsigned long)(prom_init) + mem) > max) {
+ if ((off + 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))
+ if (!memcmp(prom_init, prom_init + mem, 32))
break;
}