From efbc74ace95338484f8d732037b99c7c77098fce Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 24 Feb 2012 12:12:38 +0100 Subject: [PATCH] ARM: 7345/1: errata: update workaround for A9 erratum #743622 Erratum #743622 affects all r2 variants of the Cortex-A9 processor, so ensure that the workaround is applied regardless of the revision. Cc: Reported-by: Russell King Signed-off-by: Will Deacon Signed-off-by: Russell King --- arch/arm/Kconfig | 2 +- arch/arm/mm/proc-v7.S | 4 +--- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a48aecc17eac..dfb0312f4e73 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1280,7 +1280,7 @@ config ARM_ERRATA_743622 depends on CPU_V7 help This option enables the workaround for the 743622 Cortex-A9 - (r2p0..r2p2) erratum. Under very rare conditions, a faulty + (r2p*) erratum. Under very rare conditions, a faulty optimisation in the Cortex-A9 Store Buffer may lead to data corruption. This workaround sets a specific bit in the diagnostic register of the Cortex-A9 which disables the Store Buffer diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 0404ccbb8aa3..f1c8486f7501 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -230,9 +230,7 @@ __v7_setup: mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register #endif #ifdef CONFIG_ARM_ERRATA_743622 - teq r6, #0x20 @ present in r2p0 - teqne r6, #0x21 @ present in r2p1 - teqne r6, #0x22 @ present in r2p2 + teq r5, #0x00200000 @ only present in r2p* mrceq p15, 0, r10, c15, c0, 1 @ read diagnostic register orreq r10, r10, #1 << 6 @ set bit #6 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register