From: Sangeetha Rao <sangeetha....@intel.com>
Disable the BTAC in order to prevent errors in circumstances described
by IBM PPC476 erratum 47.
Signed-off-by: Sangeetha Rao <sangeetha....@intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfi...@windriver.com>
---
arch/powerpc/kernel/head_44x.S | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 2d580c1..336e722 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -1267,9 +1267,12 @@ clear_utlb_entry:
/* We configure icbi to invalidate 128 bytes at a time since the
* current 32-bit kernel code isn't too happy with icache != dcache
* block size
+ * We also disable the BTAC as this can cause errors in some
+ * circumstances (see IBM Erratum 47).
*/
mfspr r3,SPRN_CCR0
oris r3,r3,0x0020
+ ori r3,r3,0x0040
mtspr SPRN_CCR0,r3
isync
--
2.7.4
--
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