On Sun, Nov 17, 2019 at 11:00:40AM +0100, Heinrich Schuchardt wrote: > fatload USB was reported to fail on the Sheevaplug. Debugging showed that > this was caused by an incorrect unaligned write to memory in > path_to_uefi(). > > UEFI on ARM requires that unaligned memory access is enabled. > > * ARMv5 does not support unaligned access at all. > * ARMv6 supports unaligned access when we clear the A flag and set the > U flag. > * On ARMv7 unaligned access is possible when clearing the aligned flag, > which we do in function allow_unaligned() (arch/arm/cpu/armv7/sctlr.S). > For none of the other cpus in arch/arm/cpu/ we have implemented a > similar function. > * ARMv8 allows unaligned access. > > Let EFI_LOADER on ARM depend on SYS_CPU=armv7 or SYS_CPU=armv8. > > Once we have implemented allow_unaligned() for other ARM CPUs we can add > these to Kconfig. > > Reported-by: Gray Remlin <gryr...@gmail.com> > Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
Reviewed-by: Tom Rini <tr...@konsulko.com> -- Tom
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