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author | Hauke Mehrtens <hauke@hauke-m.de> | 2010-04-01 17:27:59 +0000 |
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committer | Hauke Mehrtens <hauke@hauke-m.de> | 2010-04-01 17:27:59 +0000 |
commit | bbe4a57177ed26935f0cbf164f44a5e493d1523e (patch) | |
tree | 8bb954085d53256da80aeefbee37e9f32cb567e2 /target/linux/brcm-2.4/files/arch/mips/bcm947xx | |
parent | cf4781cfbdf414bb79a5dd4cd41bfbd225efb6a6 (diff) | |
download | upstream-bbe4a57177ed26935f0cbf164f44a5e493d1523e.tar.gz upstream-bbe4a57177ed26935f0cbf164f44a5e493d1523e.tar.bz2 upstream-bbe4a57177ed26935f0cbf164f44a5e493d1523e.zip |
brcm-2.4: fix commit r18413 "128MB ram problem"
This was missing in commit r20072
SVN-Revision: 20651
Diffstat (limited to 'target/linux/brcm-2.4/files/arch/mips/bcm947xx')
-rw-r--r-- | target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c index f635b4a6c6..c9745746c1 100644 --- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c +++ b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c @@ -21,25 +21,32 @@ void __init prom_init(int argc, const char **argv) { unsigned long mem; + unsigned long max; mips_machgroup = MACH_GROUP_BRCM; mips_machtype = MACH_BCM947XX; - /* Figure out memory size by finding aliases */ + /* Figure out memory size by finding aliases + * + * 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("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); } |