arm: Switch to -mno-unaligned-access when supported by the compiler
authorTom Rini <trini@ti.com>
Tue, 25 Feb 2014 15:27:01 +0000 (10:27 -0500)
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>
Wed, 26 Feb 2014 20:19:32 +0000 (21:19 +0100)
commit1551df35f296f0a8df32f4f2054254f46e8be252
tree5c93d004be051b5b3cfae8c5cbdf297f8b07bb9b
parentf503cc49a570b1e28a93b75bc912aedc93ba2cd0
arm: Switch to -mno-unaligned-access when supported by the compiler

When we tell the compiler to optimize for ARMv7 (and ARMv6 for that
matter) it assumes a default of SCTRL.A being cleared and unaligned
accesses being allowed and fast at the hardware level.  We set this bit
and must pass along -mno-unaligned-access so that the compiler will
still breakdown accesses and not trigger a data abort.

To better help understand the requirements of the project with respect
to unaligned memory access, the
Documentation/unaligned-memory-access.txt file has been added as
doc/README.unaligned-memory-access.txt and is taken from the v3.14-rc1
tag of the kernel.

Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Mans Rullgard <mans@mansr.com>
Signed-off-by: Tom Rini <trini@ti.com>
README
arch/arm/cpu/armv7/config.mk
arch/arm/cpu/armv8/config.mk
arch/arm/lib/interrupts.c
common/Makefile
doc/README.arm-unaligned-accesses [deleted file]
doc/README.unaligned-memory-access.txt [new file with mode: 0644]
fs/ubifs/Makefile
lib/Makefile