[U-Boot] [PATCH V4 03/11] ARM: Introduce erratum workaround for 430973

[Nishanth Menon]

430973: Stale prediction on replaced inter working branch causes
	Cortex-A8 to execute in the wrong ARM/Thumb state
Impacts: Every Cortex-A8 processors with revision lower than r2p1
Work around: Set IBE to 1

Based on ARM errata Document revision 20.0 (13 Nov 2010)

Signed-off-by: Nishanth Menon <nm at ti.com>
---
 README                     |    1 +
 arch/arm/cpu/armv7/start.S |   13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/README b/README
index e538cf061286..484ae9ee39a8 100644
--- a/README
+++ b/README
@@ -624,6 +624,7 @@ The following options need to be configured:
 		NOTE: The following can be machine specific errata. These
 		do have ability to provide rudimentary version and machine
 		specific checks, but expect no product checks.
+		CONFIG_ARM_ERRATA_430973
 		CONFIG_ARM_ERRATA_454179
 		CONFIG_ARM_ERRATA_798870
 
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 1516ed675dac..99220ce76a25 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -198,6 +198,19 @@ skip_errata_798870:
 skip_errata_454179:
 #endif
 
+#ifdef CONFIG_ARM_ERRATA_430973
+	cmp	r2, #0x21		@ Only on < r2p1
+	bge	skip_errata_430973
+
+	mrc	p15, 0, r0, c1, c0, 1	@ Read ACR
+	orr	r0, r0, #(0x1 << 6)	@ Set IBE bit
+	push	{r1-r4}			@ Save the cpu info registers
+	b	v7_arch_cp15_set_acr
+	pop	{r1-r4}			@ Restore the cpu info - fall through
+
+skip_errata_430973:
+#endif
+
 	mov	pc, lr			@ back to my caller
 ENDPROC(cpu_init_cp15)
 
-- 
1.7.9.5