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kernel
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linux
[PATCH] ARM: 2816/1: Shark: boot kernel images bigger than 1 MB
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>
authored by
Alexander Schulz
and committed by
Russell King
246b4976
b66da4a4
+33
-9
+33
-9
arch/arm/boot/compressed/head-shark.S
+33
-9
arch/arm/boot/compressed/head-shark.S
···
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mov pc, r2
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-
__copy_target: .long 0x08508000
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-
__copy_end: .long 0x08608000
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__copy_target: .long 0x08507FFC
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__copy_end: .long 0x08607FFC
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.word _start
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.word __bss_start
···
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__temp_stack: .space 128
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__mmu_off:
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adr r0, __ofw_data
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adr r0, __ofw_data @ read the 1. entry of the memory map
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ldr r0, [r0, #4]
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orr r0, r0, #0x00600000
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sub r0, r0, #4
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ldr r1, __copy_end
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ldr r3, __copy_target
···
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* from 0x08500000 to 0x08508000 if we have only 8MB
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*/
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/* As we get more 2.6-kernels it gets more and more
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* uncomfortable to be bound to kernel images of 1MB only.
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* So we add a loop here, to be able to copy some more.
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* Alexander Schulz 2005-07-17
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*/
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mov r4, #3 @ How many megabytes to copy
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__MoveCode: sub r4, r4, #1
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__Copy: ldr r2, [r0], #-4
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str r2, [r1], #-4
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teq r1, r3
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bne __Copy
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/* The firmware maps us in blocks of 1 MB, the next block is
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_below_ the last one. So our decrementing source pointer
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ist right here, but the destination pointer must be increased
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by 2 MB */
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add r1, r1, #0x00200000
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add r3, r3, #0x00100000
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teq r4, #0
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bne __MoveCode
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/* and jump to it */
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adr r2, __go_on
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adr r0, __ofw_data
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adr r2, __go_on @ where we want to jump
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adr r0, __ofw_data @ read the 1. entry of the memory map
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ldr r0, [r0, #4]
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sub r2, r2, r0
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sub r2, r2, #0x00500000
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ldr r0, __copy_target
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sub r2, r2, r0 @ we are mapped add 0e50 now, sub that (-0e00)
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sub r2, r2, #0x00500000 @ -0050
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ldr r0, __copy_target @ and add 0850 8000 instead
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add r0, r0, #4
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add r2, r2, r0
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mov pc, r2
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mov pc, r2 @ and jump there
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__go_on:
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adr sp, __temp_stack