diff options
| author | Nishanth Menon <nm@ti.com> | 2015-03-09 17:12:01 -0500 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-03-13 09:28:52 -0400 |
| commit | 5902f4ce0f2bd1411e40dc0ece3598a0fc19b2ae (patch) | |
| tree | 45f3d8a7d6f3eeedd9686dee52df66f3933f70c2 /arch/arm/cpu/armv7/start.S | |
| parent | b45c48a7c30734272371fede01e96f499a314664 (diff) | |
ARM: Introduce erratum workaround for 430973
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@ti.com>
Tested-by: Matt Porter <mporter@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'arch/arm/cpu/armv7/start.S')
| -rw-r--r-- | arch/arm/cpu/armv7/start.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 8483687879..41fb24cf32 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -202,6 +202,19 @@ 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-r5} @ Save the cpu info registers + bl v7_arch_cp15_set_acr + pop {r1-r5} @ Restore the cpu info - fall through + +skip_errata_430973: +#endif + mov pc, r5 @ back to my caller ENDPROC(cpu_init_cp15) |