[U-Boot] [PATCH] mpc83xx: use r4 instead of r2 in lock_ram_in_cache and unlock_ram_in_cache

[Nick Spence]

This is needed in unlock_ram_in_cache() because it is called from C and
will corrupt the small data area anchor that is kept in R2.

lock_ram_in_cache() is modified similarly as good coding practice, but
is not called from C.

Signed-off-by: Nick Spence <nick.spence at freescale.com>
---
 cpu/mpc83xx/start.S |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S
index 16ed494..75ad36c 100644
--- a/cpu/mpc83xx/start.S
+++ b/cpu/mpc83xx/start.S
@@ -1060,9 +1060,9 @@ lock_ram_in_cache:
 	 */
 	lis	r3, (CFG_INIT_RAM_ADDR & ~31)@h
 	ori	r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
-	li	r2, ((CFG_INIT_RAM_END & ~31) + \
+	li	r4, ((CFG_INIT_RAM_END & ~31) + \
 		     (CFG_INIT_RAM_ADDR & 31) + 31) / 32
-	mtctr	r2
+	mtctr	r4
 1:
 	dcbz	r0, r3
 	addi	r3, r3, 32
@@ -1082,8 +1082,9 @@ unlock_ram_in_cache:
 	/* invalidate the INIT_RAM section */
 	lis	r3, (CFG_INIT_RAM_ADDR & ~31)@h
 	ori	r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
-	li	r2,512
-	mtctr	r2
+	li	r4, ((CFG_INIT_RAM_END & ~31) + \
+		     (CFG_INIT_RAM_ADDR & 31) + 31) / 32
+	mtctr	r4
 1:	icbi	r0, r3
 	dcbi	r0, r3
 	addi	r3, r3, 32
-- 
1.5.2.2