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[PATCH] MIPS: Bcm47xx: Fix 128MB RAM support

To: ralf@linux-mips.org
Subject: [PATCH] MIPS: Bcm47xx: Fix 128MB RAM support
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 20 Feb 2010 19:51:20 +0100
Cc: linux-mips@linux-mips.org, Hauke Mehrtens <hauke@hauke-m.de>
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
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>
---
 arch/mips/bcm47xx/prom.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/mips/bcm47xx/prom.c b/arch/mips/bcm47xx/prom.c
index 5efc995..0fa646c 100644
--- 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);
 }
 
-- 
1.6.3.3


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