From e5eefed084d1ec1fcfe9840693ceb12c759d26aa Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 30 Sep 2012 11:43:40 +0000
Subject: [PATCH] ignore the last page on bcma based SoCs
SVN-Revision: 33598
---
...MIPS-BCM47XX-ignore-last-memory-page.patch | 33 +++++++++++++++++++
1 file changed, 33 insertions(+)
create mode 100644 target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch
diff --git a/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch b/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch
new file mode 100644
index 0000000000..9f7d5dcdb4
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch
@@ -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 = ¤t_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);
+ }
+
--
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