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[PATCH] ARM: 2816/1: Shark: boot kernel images bigger than 1 MB

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Patch from Alexander Schulz

Up to now, shark kernels were limited to one megabyte compressed
size. As the kernels get bigger, this becomes more and more
uncomfortable. So I added a loop to copy 3 MB instead of one
and added some comments.

Signed-off-by: Alexander Schulz <alex@shark-linux.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Alexander Schulz 2005-07-17 20:12:08 +01:00 committed by Russell King
parent b66da4a485
commit 246b49768b
1 changed files with 33 additions and 9 deletions
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42
arch/arm/boot/compressed/head-shark.S
View file

@ -63,8 +63,8 @@ __beginning: mov r4, r0 @ save the entry to the firmware
mov pc, r2
__copy_target: .long 0x08508000
__copy_end: .long 0x08608000
__copy_target: .long 0x08507FFC
__copy_end: .long 0x08607FFC
.word _start
.word __bss_start
@ -73,9 +73,10 @@ __copy_end: .long 0x08608000
__temp_stack: .space 128
__mmu_off:
adr r0, __ofw_data
adr r0, __ofw_data @ read the 1. entry of the memory map
ldr r0, [r0, #4]
orr r0, r0, #0x00600000
sub r0, r0, #4
ldr r1, __copy_end
ldr r3, __copy_target
@ -89,20 +90,43 @@ __mmu_off:
* from 0x08500000 to 0x08508000 if we have only 8MB
*/
/* As we get more 2.6-kernels it gets more and more
* uncomfortable to be bound to kernel images of 1MB only.
* So we add a loop here, to be able to copy some more.
* Alexander Schulz 2005-07-17
*/
mov r4, #3 @ How many megabytes to copy
__MoveCode: sub r4, r4, #1
__Copy: ldr r2, [r0], #-4
str r2, [r1], #-4
teq r1, r3
bne __Copy
/* The firmware maps us in blocks of 1 MB, the next block is
_below_ the last one. So our decrementing source pointer
ist right here, but the destination pointer must be increased
by 2 MB */
add r1, r1, #0x00200000
add r3, r3, #0x00100000
teq r4, #0
bne __MoveCode
/* and jump to it */
adr r2, __go_on
adr r0, __ofw_data
adr r2, __go_on @ where we want to jump
adr r0, __ofw_data @ read the 1. entry of the memory map
ldr r0, [r0, #4]
sub r2, r2, r0
sub r2, r2, #0x00500000
ldr r0, __copy_target
sub r2, r2, r0 @ we are mapped add 0e50 now, sub that (-0e00)
sub r2, r2, #0x00500000 @ -0050
ldr r0, __copy_target @ and add 0850 8000 instead
add r0, r0, #4
add r2, r2, r0
mov pc, r2
mov pc, r2 @ and jump there
__go_on:
adr sp, __temp_stack