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| author | Martin Townsend <martin@rufilla.com> | 2021-02-26 08:44:44 +0000 |
|---|---|---|
| committer | Eugen Hristev <eugen.hristev@microchip.com> | 2021-03-22 10:53:52 +0200 |
| commit | bbfb81c1876f32b8991cf34cf0fa5525e9f28afd (patch) | |
| tree | 8f271294b808f09cab89b887bf5306b92765e9bf /board/st/stm32h743-disco/stm32h743-disco.c | |
| parent | 8bad34a7090fd015d9f62d4145cb2109faa7641a (diff) | |
ARM: mach-at91: arm926ejs: fix data abort in startup returning from lowlevel_init
The startup code in arm/cpu/arm926ejs preserves the link register across
the call to lowlevel_init by using r4:
mov r4, lr /* perserve link reg across call */
bl lowlevel_init /* go setup pll,mux,memory */
mov lr, r4 /* restore link */
The lowlevel_init function for at91 machines based on the same CPU uses r4
and hence corrupts it causing a data abort when it returns to the startup
code. This patch fixes this by using r6 instead of r4 in the lowlevel_init
function.
Discovered and the fix was tested on a AT91SAM9261 based board.
Signed-off-by: Martin Townsend <martin@rufilla.com>
Reviewed-by: Eugen Hristev <eugen.hristev@microchip.com>
Diffstat (limited to 'board/st/stm32h743-disco/stm32h743-disco.c')
0 files changed, 0 insertions, 0 deletions