[ARM] 5489/1: ARM errata: Data written to the L2 cache can be overwritten with stale data

This patch is a workaround for the 460075 Cortex-A8 (r2p0) erratum. It
configures the L2 cache auxiliary control register so that the Write
Allocate mode for the L2 cache is disabled.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 49f85664083d..9faccc411c2a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -778,6 +778,18 @@ config ARM_ERRATA_458693
           in the ACTLR register. Note that setting specific bits in the ACTLR
           register may not be available in non-secure mode.
 
+config ARM_ERRATA_460075
+        bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
+        depends on CPU_V7
+        help
+          This option enables the workaround for the 460075 Cortex-A8 (r2p0)
+          erratum. Any asynchronous access to the L2 cache may encounter a
+          situation in which recent store transactions to the L2 cache are lost
+          and overwritten with stale memory contents from external memory. The
+          workaround disables the write-allocate mode for the L2 cache via the
+          ACTLR register. Note that setting specific bits in the ACTLR register
+          may not be available in non-secure mode.
+
 endmenu
 
 source "arch/arm/common/Kconfig"