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MIPS: BCM47xx: Fix 128MB RAM support

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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.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/981/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Hauke Mehrtens 2010-02-20 19:51:20 +01:00 committed by Ralf Baechle
parent 52ab320ac5
commit 84a6fcb368
1 changed files with 8 additions and 0 deletions
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arch/mips/bcm47xx/prom.c
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@ -141,6 +141,14 @@ static __init void prom_init_mem(void)
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);
}