Merge branch 'for-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/powerpc-4xx

* 'for-2.6.26' of git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/powerpc-4xx:
  [POWERPC] 4xx: Workaround for CHIP_11 Errata

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/powerpc/boot/4xx.c b/arch/powerpc/boot/4xx.c
index 758edf1c5815..5c878436f348 100644
--- a/arch/powerpc/boot/4xx.c
+++ b/arch/powerpc/boot/4xx.c
@@ -21,6 +21,25 @@
 #include "reg.h"
 #include "dcr.h"
 
+static unsigned long chip_11_errata(unsigned long memsize)
+{
+        unsigned long pvr;
+
+        pvr = mfpvr();
+
+        switch (pvr & 0xf0000ff0) {
+                case 0x40000850:
+                case 0x400008d0:
+                case 0x200008d0:
+                        memsize -= 4096;
+                        break;
+                default:
+                        break;
+        }
+
+        return memsize;
+}
+
 /* Read the 4xx SDRAM controller to get size of system memory. */
 void ibm4xx_sdram_fixup_memsize(void)
 {
@@ -34,6 +53,7 @@ void ibm4xx_sdram_fixup_memsize(void)
                         memsize += SDRAM_CONFIG_BANK_SIZE(bank_config);
         }
 
+        memsize = chip_11_errata(memsize);
         dt_fixup_memory(0, memsize);
 }
 
@@ -199,6 +219,7 @@ void ibm4xx_denali_fixup_memsize(void)
                 bank = 4; /* 4 banks */
 
         memsize = cs * (1 << (col+row)) * bank * dpath;
+        memsize = chip_11_errata(memsize);
         dt_fixup_memory(0, memsize);
 }