diff --git a/board/amcc/canyonlands/init.S b/board/amcc/canyonlands/init.S
index 51b46d71071e53aee762d54618141d0cf26c85a8..0b667968accd56be09dea92997e6c34c4ee1f9a9 100644
--- a/board/amcc/canyonlands/init.S
+++ b/board/amcc/canyonlands/init.S
@@ -89,7 +89,7 @@ tlbtab:
 #endif
 
 	/* TLB-entry for OCM */
-	tlbentry(CONFIG_SYS_OCM_BASE, SZ_16K, 0x00040000, 4, AC_R|AC_W|AC_X|SA_I)
+	tlbentry(CONFIG_SYS_OCM_BASE, SZ_1M, 0x00000000, 4, AC_R|AC_W|AC_X|SA_I)
 
 	/* TLB-entry for Local Configuration registers => peripherals */
 	tlbentry(CONFIG_SYS_LOCAL_CONF_REGS, SZ_16M, CONFIG_SYS_LOCAL_CONF_REGS, 4, AC_R|AC_W|AC_X|SA_G|SA_I)
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S
index db34e84d3efffa471503747e047f6b3cb2ebee80..e68cf9b6db1856d8efaa8c0921e357ad785386cb 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -678,9 +678,12 @@ _start:
 	/* not all PPC's have internal SRAM usable as L2-cache */
 #if defined(CONFIG_440GX) || \
     defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
-    defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
     defined(CONFIG_460SX)
 	mtdcr	L2_CACHE_CFG,r0		/* Ensure L2 Cache is off */
+#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r1, 0x0000
+	ori	r1,r1,0x0008		/* Set L2_CACHE_CFG[RDBW]=1 */
+	mtdcr	L2_CACHE_CFG,r1
 #endif
 
 	lis	r2,0x7fff
@@ -705,8 +708,8 @@ _start:
 	lis	r1, 0x8003
 	ori	r1,r1, 0x0980		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#elif defined(CONFIG_440SPE)
-	lis	r1,0x0000		/* BAS = 0000_0000 */
+#elif defined(CONFIG_440SPE) || defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r1,0x0000		/* BAS = X_0000_0000 */
 	ori	r1,r1,0x0984		/* first 64k */
 	mtdcr	ISRAM0_SB0CR,r1
 	lis	r1,0x0001
@@ -718,10 +721,20 @@ _start:
 	lis	r1, 0x0003
 	ori	r1,r1, 0x0984		/* fourth 64k */
 	mtdcr	ISRAM0_SB3CR,r1
-#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
-	lis	r1,0x4000		/* BAS = 8000_0000 */
-	ori	r1,r1,0x4580		/* 16k */
-	mtdcr	ISRAM0_SB0CR,r1
+#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
+	lis	r2,0x7fff
+	ori	r2,r2,0xffff
+	mfdcr	r1,ISRAM1_DPC
+	and	r1,r1,r2		/* Disable parity check */
+	mtdcr	ISRAM1_DPC,r1	
+	mfdcr	r1,ISRAM1_PMEG
+	and	r1,r1,r2		/* Disable pwr mgmt */
+	mtdcr	ISRAM1_PMEG,r1
+
+	lis	r1,0x0004		/* BAS = 4_0004_0000 */
+	ori	r1,r1,0x0984		/* 64k */
+	mtdcr	ISRAM1_SB0CR,r1
+#endif
 #elif defined(CONFIG_460SX)
 	lis     r1,0x0000               /* BAS = 0000_0000 */
 	ori     r1,r1,0x0B84            /* first 128k */
diff --git a/include/configs/canyonlands.h b/include/configs/canyonlands.h
index f8e880181b758ada468396d39a9748ad3601e82f..faf630496dbbad62b5599155610fe2d4102adcc3 100644
--- a/include/configs/canyonlands.h
+++ b/include/configs/canyonlands.h
@@ -102,7 +102,7 @@
 #define CONFIG_SYS_FLASH_BASE_PHYS	(((u64)CONFIG_SYS_FLASH_BASE_PHYS_H << 32) |	\
 					 (u64)CONFIG_SYS_FLASH_BASE_PHYS_L)
 
-#define CONFIG_SYS_OCM_BASE		0xE3000000	/* OCM: 16k		*/
+#define CONFIG_SYS_OCM_BASE		0xE3000000	/* OCM: 64k		*/
 #define CONFIG_SYS_SRAM_BASE		0xE8000000	/* SRAM: 256k		*/
 #define CONFIG_SYS_LOCAL_CONF_REGS	0xEF000000