[PATCH] ARM: explicitly disable BTB on ixp2350

[PATCH] ARM: explicitly disable BTB on ixp2350

[Deepak Saxena]

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>

Index: linux-2.6.17-rc3/arch/arm/mm/proc-xsc3.S
===================================================================
--- linux-2.6.17-rc3.orig/arch/arm/mm/proc-xsc3.S
+++ linux-2.6.17-rc3/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


-- 
Deepak Saxena - dsaxena@plexity.net - http://www.plexity.net

In the end, they will not say, "those were dark times,"  they will ask
"why were their poets silent?" - Bertold Brecht