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[brcm47xx]: ignore the last page on bcma based SoCs

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33598 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
hauke 2012-09-30 11:43:40 +00:00
parent 43594d67bf
commit ea8a5ad7cc
1 changed files with 33 additions and 0 deletions
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33
target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch Normal file
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@ -0,0 +1,33 @@
--- a/arch/mips/bcm47xx/prom.c
+++ b/arch/mips/bcm47xx/prom.c
@@ -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>
@@ -59,6 +60,7 @@ 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.
*
@@ -87,6 +89,14 @@ 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);
}