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authorTimur Tabi <timur@freescale.com>2006-08-22 17:07:00 -0500
committerKim Phillips <kim.phillips@freescale.com>2006-11-03 19:42:18 -0600
commit31068b7c4abeefcb2c8fd4fbeccc8ec6c6d0475a (patch)
treeb55967a67a30c243ed10b111f06a6e648c6a7728 /cpu/mpc83xx
parent2fc34ae66e73fa7841d1a006dc1b5dcbc1f78965 (diff)
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mpc83xx: Add support for variable flash memory sizes on 83xx systems
CHANGELOG: * On 83xx systems, use the CFG_FLASH_SIZE macro to program the LBC local access window registers, instead of using a hard-coded value of 8MB. Signed-off-by: Timur Tabi <timur@freescale.com>
Diffstat (limited to 'cpu/mpc83xx')
-rw-r--r--cpu/mpc83xx/start.S29
1 files changed, 21 insertions, 8 deletions
diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S
index 6e02cce..a7ed3c5 100644
--- a/cpu/mpc83xx/start.S
+++ b/cpu/mpc83xx/start.S
@@ -2,7 +2,7 @@
* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
* Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
- * Copyright 2004 Freescale Semiconductor, Inc.
+ * Copyright Freescale Semiconductor, Inc. 2004, 2006. All rights reserved.
*
* See file CREDITS for list of people who contributed to this
* project.
@@ -1214,8 +1214,15 @@ map_flash_by_law1:
lis r4, (CFG_FLASH_BASE)@h
ori r4, r4, (CFG_FLASH_BASE)@l
stw r4, LBLAWBAR1(r3) /* LBLAWBAR1 <= CFG_FLASH_BASE */
- lis r4, (0x80000016)@h
- ori r4, r4, (0x80000016)@l
+
+ /* Store 0x80000012 + log2(CFG_FLASH_SIZE) into LBLAWAR1 */
+ lis r4, (0x80000012)@h
+ ori r4, r4, (0x80000012)@l
+ li r5, CFG_FLASH_SIZE
+1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
+ addi r4, r4, 1
+ bne 1b
+
stw r4, LBLAWAR1(r3) /* LBLAWAR1 <= 8MB Flash Size */
blr
@@ -1234,17 +1241,23 @@ remap_flash_by_law0:
stw r5, BR0(r3) /* r5 <= (CFG_FLASH_BASE & 0xFFFF8000) | (BR0 & 0x00007FFF) */
lwz r4, OR0(r3)
- lis r5, 0xFF80 /* 8M */
+ lis r5, ~((CFG_FLASH_SIZE << 4) - 1)
or r4, r4, r5
- stw r4, OR0(r3) /* OR0 <= OR0 | 0xFF800000 */
+ stw r4, OR0(r3)
lis r4, (CFG_FLASH_BASE)@h
ori r4, r4, (CFG_FLASH_BASE)@l
stw r4, LBLAWBAR0(r3) /* LBLAWBAR0 <= CFG_FLASH_BASE */
- lis r4, (0x80000016)@h
- ori r4, r4, (0x80000016)@l
- stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= 8MB Flash Size */
+ /* Store 0x80000012 + log2(CFG_FLASH_SIZE) into LBLAWAR0 */
+ lis r4, (0x80000012)@h
+ ori r4, r4, (0x80000012)@l
+ li r5, CFG_FLASH_SIZE
+1: srawi. r5, r5, 1 /* r5 = r5 >> 1 */
+ addi r4, r4, 1
+ bne 1b
+ stw r4, LBLAWAR0(r3) /* LBLAWAR0 <= Flash Size */
+
xor r4, r4, r4
stw r4, LBLAWBAR1(r3)