ppc4xx: Changed 460EX/GT OCM TLB and internal SRAM initialization
Expanded OCM TLB to allow access to 64K OCM as well as 256K of
internal SRAM.
Adjusted internal SRAM initialization to match updated user
manual recommendation.
OCM & ISRAM are now mapped as follows:
physical virtual size
ISRAM 0x4_0000_0000 0xE300_0000 256k
OCM 0x4_0004_0000 0xE304_0000 64k
A single TLB was used for this mapping.
Signed-off-by: Dave Mitchell <dmitch71@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/board/amcc/canyonlands/init.S b/board/amcc/canyonlands/init.S
index 51b46d7..0b66796 100644
--- a/board/amcc/canyonlands/init.S
+++ b/board/amcc/canyonlands/init.S
@@ -89,7 +89,7 @@
#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 db34e84..e68cf9b 100644
--- a/cpu/ppc4xx/start.S
+++ b/cpu/ppc4xx/start.S
@@ -678,9 +678,12 @@
/* 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 @@
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 @@
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 f8e8801..faf6304 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
