summaryrefslogtreecommitdiffstats
path: root/arch/cris/arch-v10/boot/rescue/head.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/cris/arch-v10/boot/rescue/head.S')
-rw-r--r--arch/cris/arch-v10/boot/rescue/head.S33
1 files changed, 27 insertions, 6 deletions
diff --git a/arch/cris/arch-v10/boot/rescue/head.S b/arch/cris/arch-v10/boot/rescue/head.S
index 8689ea9..addb219 100644
--- a/arch/cris/arch-v10/boot/rescue/head.S
+++ b/arch/cris/arch-v10/boot/rescue/head.S
@@ -1,4 +1,4 @@
-/* $Id: head.S,v 1.6 2003/04/09 08:12:43 pkj Exp $
+/* $Id: head.S,v 1.7 2005/03/07 12:11:06 starvik Exp $
*
* Rescue code, made to reside at the beginning of the
* flash-memory. when it starts, it checks a partition
@@ -121,12 +121,13 @@
;; 0x80000000 if loaded in flash (as it should be)
;; since etrax actually starts at address 2 when booting from flash, we
;; put a nop (2 bytes) here first so we dont accidentally skip the di
-
+
nop
di
jump in_cache ; enter cached area instead
-in_cache:
+in_cache:
+
;; first put a jump test to give a possibility of upgrading the rescue code
;; without erasing/reflashing the sector. we put a longword of -1 here and if
@@ -325,9 +326,29 @@ flash_ok:
;; result will be in r0
checksum:
moveq 0, $r0
-1: addu.b [$r1+], $r0
- subq 1, $r2
- bne 1b
+ moveq CONFIG_ETRAX_FLASH1_SIZE, $r6
+
+ ;; If the first physical flash memory is exceeded wrap to the second one.
+ btstq 26, $r1 ; Are we addressing first flash?
+ bpl 1f
+ nop
+ clear.d $r6
+
+1: test.d $r6 ; 0 = no wrapping
+ beq 2f
+ nop
+ lslq 20, $r6 ; Convert MB to bytes
+ sub.d $r1, $r6
+
+2: addu.b [$r1+], $r0
+ subq 1, $r6 ; Flash memory left
+ beq 3f
+ subq 1, $r2 ; Length left
+ bne 2b
nop
ret
nop
+
+3: move.d MEM_CSE1_START, $r1 ; wrap to second flash
+ ba 2b
+ nop
OpenPOWER on IntegriCloud