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arm: Make reset position-independent

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Some boards, like mx31pdk and tx25, require the beginning of the SPL
code to be position-independent. For these two boards, this is because
they use the i.MX external NAND boot, which starts by executing the
first NAND Flash page from the NFC page buffer. The SPL then needs to
copy itself to its actual link address in order to free the NFC page
buffer and use it to load the non-SPL image from Flash before running
it. This means that the SPL runtime address differs from its link
address between the reset and the initial copy performed by
board_init_f(), so this part of the SPL binary must be
position-independent.

This requirement was broken by commit 41623c9 'arm: move exception
handling out of start.S files', which used an absolute address to branch
to the reset routine. This new commit restores the original behavior,
which just performed a relative branch. This fixes the boot of mx31pdk
and tx25.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
Reported-by: Helmut Raiger <helmut.raiger@hale.at>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Magnus Lilja <lilja.magnus@gmail.com>
Cc: John Rigby <jcrigby@gmail.com>
Tested-by: Magnus Lilja <lilja.magnus@gmail.com>
This commit is contained in:
Benoît Thébaudeau 2014-09-03 23:32:33 +02:00 committed by Albert ARIBAUD
parent 5bfdcebf73
commit 58f9e1ae63
1 changed files with 1 additions and 2 deletions
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3
arch/arm/lib/vectors.S
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@ -50,7 +50,7 @@
#endif
_start:
ldr pc, _reset
b reset
ldr pc, _undefined_instruction
ldr pc, _software_interrupt
ldr pc, _prefetch_abort
@ -77,7 +77,6 @@ _start:
.globl _irq
.globl _fiq
_reset: .word reset
_undefined_instruction: .word undefined_instruction
_software_interrupt: .word software_interrupt
_prefetch_abort: .word prefetch_abort