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ppc4xx: Changed 460EX/GT OCM TLB and internal SRAM initialization

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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>
This commit is contained in:
Dave Mitchell 2008-11-20 14:09:50 -06:00 committed by Stefan Roese
parent b14ca4b61a
commit ddf45cc758
3 changed files with 22 additions and 9 deletions
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2
board/amcc/canyonlands/init.S
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@ -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)

27
cpu/ppc4xx/start.S
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@ -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 */

2
include/configs/canyonlands.h
View File

@ -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