From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 30 Sep 2012 11:43:40 +0000 (+0000)
Subject: ignore the last page on bcma based SoCs
X-Git-Tag: reboot~12760
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e5eefed084d1ec1fcfe9840693ceb12c759d26aa;p=openwrt%2Fstaging%2Fchunkeey.git

ignore the last page on bcma based SoCs

SVN-Revision: 33598
---

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 = &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);
+ }
+