[uClinux-dev] [PATCHv2] m68knommu: do not request separate stack pointers on m5407

Philippe De Muyter phdm at macqel.be
Fri Nov 5 08:10:25 EDT 2010


from MCF5407 ColdFire User’s Manual :
	[bits 7-0] must be cleared; otherwise, performance may be affected.

Signed-off-by: Philippe De Muyter <phdm at macqel.be>
---
 arch/m68k/include/asm/m54xxacr.h |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/m68k/include/asm/m54xxacr.h b/arch/m68k/include/asm/m54xxacr.h
index 27cd530..a248b23 100644
--- a/arch/m68k/include/asm/m54xxacr.h
+++ b/arch/m68k/include/asm/m54xxacr.h
@@ -26,7 +26,9 @@
 #define CACR_IHLCK	0x00000800	/* Intruction cache half lock */
 #define CACR_IDCM	0x00000400	/* Intruction cache inhibit */
 #define CACR_ICINVA	0x00000100	/* Invalidate instr cache */
-#define	CACR_EUSP	0x00000020	/* Enable separate user a7 */
+#if defined(CONFIG_M54xx)
+#define CACR_EUSP	0x00000020	/* Enable separate user a7 */
+#endif
 
 #define ACR_BASE_POS	24		/* Address Base */
 #define ACR_MASK_POS	16		/* Address Mask */
@@ -68,7 +70,12 @@
 	/* Enable data store buffer */
 	/* outside ACRs : No cache, precise */
 	/* Enable instruction+branch caches */
-#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC+CACR_EUSP)
+#define _CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC)
+#if defined(CONFIG_M5407)
+#define CACHE_MODE (_CACHE_MODE)
+#else
+#define CACHE_MODE (_CACHE_MODE+CACR_EUSP)
+#endif
 
 #define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)
 
-- 
1.7.1




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