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MIPS: BCM47XX: ignore last memory page

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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>
Patchwork: http://patchwork.linux-mips.org/patch/4365
Signed-off-by: John Crispin <blogic@openwrt.org>
This commit is contained in:
Hauke Mehrtens 2012-10-03 11:34:16 +00:00 committed by John Crispin
parent b5b64f2ba4
commit d3dce3d676
1 changed files with 10 additions and 0 deletions
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10
arch/mips/bcm47xx/prom.c
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@ -27,6 +27,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <asm/bootinfo.h>
#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>
@ -127,6 +128,7 @@ static __init void prom_init_mem(void)
{
unsigned long mem;
unsigned long max;
struct cpuinfo_mips *c = &current_cpu_data;
/* Figure out memory size by finding aliases.
*
@ -155,6 +157,14 @@ 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 (c->cputype == CPU_74K && (mem == (128 << 20)))
mem -= 0x1000;
add_memory_region(0, mem, BOOT_MEM_RAM);
}