diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2006-12-01 19:31:42 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-12-01 23:40:37 +0000 |
| commit | f5236225a3858b505221a59233af1f1158be9139 (patch) | |
| tree | 1d59e171dae730ead66c21cb243d218df4ab457c /arch | |
| parent | 0e5fdca7622eb950f42f97a1970670e00a739175 (diff) | |
| download | op-kernel-dev-f5236225a3858b505221a59233af1f1158be9139.zip op-kernel-dev-f5236225a3858b505221a59233af1f1158be9139.tar.gz | |
[ARM] 3967/1: xsc3: make branch predication configurable on xsc3
Remove BTB_ENABLE from proc-xsc3.S
On some early revisions of xsc3 enabling the branch target buffer can cause
crashes, see erratum #42.
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/mm/proc-xsc3.S | 7 |
2 files changed, 1 insertions, 8 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index c0bfb82..efebd60 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -580,7 +580,7 @@ config CPU_CACHE_ROUND_ROBIN config CPU_BPREDICT_DISABLE bool "Disable branch prediction" - depends on CPU_ARM1020 || CPU_V6 + depends on CPU_ARM1020 || CPU_V6 || CPU_XSC3 help Say Y here to disable branch prediction. If unsure, say N. diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S index 85c3523..1ef564d 100644 --- a/arch/arm/mm/proc-xsc3.S +++ b/arch/arm/mm/proc-xsc3.S @@ -57,11 +57,6 @@ #define L2_CACHE_ENABLE 1 /* - * Enable the Branch Target Buffer (can cause crashes, see erratum #42.) - */ -#define BTB_ENABLE 0 - -/* * This macro is used to wait for a CP15 write and is needed * when we have to ensure that the last operation to the co-pro * was completed before continuing with operation. @@ -434,9 +429,7 @@ __xsc3_setup: mrc p15, 0, r0, c1, c0, 0 @ get control register bic r0, r0, r5 @ .... .... .... ..A. orr r0, r0, r6 @ .... .... .... .C.M -#if BTB_ENABLE orr r0, r0, #0x00000800 @ ..VI Z..S .... .... -#endif #if L2_CACHE_ENABLE orr r0, r0, #0x04000000 @ L2 enable #endif |
