From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Tue, 19 Nov 2019 10:30:03 -0500 Subject: [U-Boot] [PATCH 1/1] efi_loader: restrict EFI_LOADER to armv7 and armv8 on ARM In-Reply-To: <20191117100040.8682-1-xypron.glpk@gmx.de> References: <20191117100040.8682-1-xypron.glpk@gmx.de> Message-ID: <20191119153003.GC19317@bill-the-cat> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 > Signed-off-by: Heinrich Schuchardt Reviewed-by: Tom Rini -- Tom -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 833 bytes Desc: not available URL: