[PATCH] ARM: explicitly disable BTB on ixp2350

We don't enable the BTB on the ixp2350 as that can cause weird
crashes (erratum #42.)  However, some bootloaders enable the BTB,
which means that we have to disable the BTB explicitly.

Found thanks to Tom Rini.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S
index 80873b36c3f7a562657a32d9de47e790972cb2d9..8d32e21fe151a919630dc866205974888b624e3a 100644 (file)
--- a/arch/arm/mm/proc-xsc3.S
+++ b/arch/arm/mm/proc-xsc3.S
@@ -427,12 +427,13 @@ __xsc3_setup:
 #endif
        mcr     p15, 0, r0, c1, c0, 1           @ set auxiliary control reg
        mrc     p15, 0, r0, c1, c0, 0           @ get control register
-       bic     r0, r0, #0x0200                 @ .... ..R. .... ....
        bic     r0, r0, #0x0002                 @ .... .... .... ..A.
        orr     r0, r0, #0x0005                 @ .... .... .... .C.M
 #if BTB_ENABLE
+       bic     r0, r0, #0x0200                 @ .... ..R. .... ....
        orr     r0, r0, #0x3900                 @ ..VI Z..S .... ....
 #else
+       bic     r0, r0, #0x0a00                 @ .... Z.R. .... ....
        orr     r0, r0, #0x3100                 @ ..VI ...S .... ....
 #endif
 #if L2_CACHE_ENABLE