diff options
| author | Nitin Garg <nitin.garg@freescale.com> | 2014-04-02 08:55:01 -0500 |
|---|---|---|
| committer | Vince Bridgers <vbridger@opensource.altera.com> | 2014-11-05 06:19:43 -0600 |
| commit | 71282e2806669bdaa640688fa69f30705091e453 (patch) | |
| tree | c9a10997524c5743127736ac527269eef2191fed | |
| parent | 2fa71773fa9efd95aa47e2a6d87a5cc79a0f7cb3 (diff) | |
| download | u-boot-socfpga-71282e2806669bdaa640688fa69f30705091e453.tar.gz | |
ARM: Add workaround for Cortex-A9 errata 794072
A short loop including a DMB instruction might cause a denial of
service on another processor which executes a CP15 broadcast operation.
Exists on r1, r2, r3, r4 revisions.
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
| -rw-r--r-- | README | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/armv7/start.S | 2 |
2 files changed, 2 insertions, 1 deletions
@@ -489,6 +489,7 @@ The following options need to be configured: CONFIG_ARM_ERRATA_742230 CONFIG_ARM_ERRATA_743622 CONFIG_ARM_ERRATA_751472 + CONFIG_ARM_ERRATA_794072 If set, the workarounds for these ARM errata are applied early during U-Boot startup. Note that these options force the diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 306703a2f7..2d32235427 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -325,7 +325,7 @@ ENTRY(cpu_init_cp15) mcr p15, 0, r0, c1, c0, 0 @ write system control register #endif -#ifdef CONFIG_ARM_ERRATA_742230 +#if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072)) mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register orr r0, r0, #1 << 4 @ set bit #4 mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register |