[U-Boot] ELF_RELOC causes strange I-cache issues

[Albert Aribaud]

Wolfgang (and others who can/want),

Please test this patch; it should add a complete barrier to make
sure that all fixups are written to RAM before jumping there, and
that no remnants subsist of the old unfixed code in the instruction
paths. However, I cannot even do basic testing on it as I have
no 1136 board, so I cannot rule out even basic mistakes.

When this works I'll do a proper [PATCH].

Amicalement,
Albert.

diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S
index 8b63192..f49f1de 100644
--- a/arch/arm/cpu/arm1136/start.S
+++ b/arch/arm/cpu/arm1136/start.S
@@ -257,6 +257,11 @@ fixloop:
 	add	r2, r2, #4
 	cmp	r2, r3
 	bne	fixloop
+	/* fixups done, cleanup caches if used and prefetch buffer */
+	mov	r3, #0
+	mcr	p15, 0, r3, c7, c10, 4	/* data synchronization barrier */
+	mcr	p15, 0, r3, c7, c5, 0	/* invalidate instruction cache */
+	mcr	p15, 0, r3, c7, c5, 4	/* flush prefetch buffer */
 #endif
 #endif	/* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
 
-- 
1.7.1