With recent gcc, unaligned access is enabled by default on ARMv6+ CPUs. This can cause problems when bootloader is located e.g. in SRAM where such an access is not supported. Patch adds a Kconfig option were the default behavior can be overridden. Signed-off-by: Enrico Scholz <enrico.scholz@xxxxxxxxxxxxxxxxx> --- arch/arm/Kconfig | 8 ++++++++ arch/arm/Makefile | 4 ++++ 2 files changed, 12 insertions(+) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 3afd885..53c36d1 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -200,6 +200,14 @@ config ARM_UNWIND the performance is not affected. Currently, this feature only works with EABI compilers. If unsure say Y. +config ARM_NOUNALIGNED + bool "disable unaligned access" + help + With recent gcc, unaligned access is enabled by default on ARMv6+ + CPUs. This can cause problems when bootloader is located e.g. in + SRAM were such an access is not supported. Selection this option + sets the '-mno-unaligned-access' compiler flag. + endmenu source common/Kconfig diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 8cef771..9544cca 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -39,6 +39,10 @@ ifeq ($(CONFIG_ARM_UNWIND),y) CFLAGS_ABI +=-funwind-tables endif +ifeq ($(CONFIG_ARM_NOUNALIGNED),y) +CFLAGS_ABI +=$(call cc-option,-mno-unaligned-access) +endif + ifeq ($(CONFIG_THUMB2_BAREBOX),y) AFLAGS_AUTOIT :=$(call as-option,-Wa$(comma)-mimplicit-it=always,-Wa$(comma)-mauto-it) AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) -- 1.7.11.7 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
