From 3fb97947af0248bba15050c336496f6dace4ff2d Mon Sep 17 00:00:00 2001
From: hauke <hauke@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Fri, 13 Nov 2009 20:32:47 +0000
Subject: [PATCH] [brcm47xx] fix problem with 128MB ram.

This patch is out of broadcoms official source code


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18413 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../brcm-2.4/files/arch/mips/bcm947xx/prom.c    |  9 +++++++++
 .../patches-2.6.28/170-128MB_ram_bugfix.patch   | 17 +++++++++++++++++
 .../patches-2.6.30/170-128MB_ram_bugfix.patch   | 17 +++++++++++++++++
 .../patches-2.6.31/170-128MB_ram_bugfix.patch   | 17 +++++++++++++++++
 4 files changed, 60 insertions(+)
 create mode 100644 target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch
 create mode 100644 target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch
 create mode 100644 target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch

diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
index be628da62..f635b4a6c 100644
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
+++ b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
@@ -31,6 +31,15 @@ prom_init(int argc, const char **argv)
 		    *(unsigned long *)(prom_init))
 			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);
 }
 
diff --git a/target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch
new file mode 100644
index 000000000..e54e3de40
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch
@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -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);
+ }
+ 
diff --git a/target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch
new file mode 100644
index 000000000..e54e3de40
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch
@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -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);
+ }
+ 
diff --git a/target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch
new file mode 100644
index 000000000..e54e3de40
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch
@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -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);
+ }
+