This one is inspired by two commits published on Emcraft git repo: https://github.com/EmcraftSystems/linux-emcraft.git 1) 6302b692f570ff9d5645a6e72c11f87b0c1aa409 RT #62654. Fixed kernel crashes while running httpd by enabling "-mfix-cortex-m3-ldrd" compiler option, which prevents compiler from generating code like 'ldrd Ra, Rb, [Ra, #Imm]' - according to the 602117 Cortex-M3 Errata it may result in incorrect base register when interrupted or faulted. by: Yuri Tikhonov <yur@xxxxxxxxxxx> 2) 359d3cda84c01c0f3fae1a519b97a31f318f57ab RT #62654. Removed "--march=..." leaving only "-mcpu=cortex-m3" to make sure only the correct instructions will be generated. by: Sergei Poselenov <sposelenov@xxxxxxxxxxx> I reworked these patches to make them less intrusive. Signed-off-by: Paul Osmialowski <pawelo@xxxxxxxxxxx> --- arch/arm/Kconfig | 2 +- arch/arm/Makefile | 1 + arch/arm/mm/Kconfig | 11 ++++++++++- 3 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a750c14..8e3a833 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -32,7 +32,7 @@ config ARM select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT) - select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6 + select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7M3 || CPU_32v7) && !CPU_32v6 select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 07ab3d2..a7e1007 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -58,6 +58,7 @@ endif # Note that GCC does not numerically define an architecture version # macro, but instead defines a whole series of macros which makes # testing for a specific architecture or later rather impossible. +arch-$(CONFIG_CPU_32v7M3) =-D__LINUX_ARM_ARCH__=7 -mcpu=cortex-m3 -Wa,-mcpu=cortex-m3 arch-$(CONFIG_CPU_32v7M) =-D__LINUX_ARM_ARCH__=7 -march=armv7-m -Wa,-march=armv7-m arch-$(CONFIG_CPU_32v7) =-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a) arch-$(CONFIG_CPU_32v6) =-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6) diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 7c6b976..d19cb4d 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -401,12 +401,18 @@ config CPU_V7 # ARMv7M config CPU_V7M bool - select CPU_32v7M + select CPU_32v7M if !CPU_CORTEXM3 + select CPU_32v7M3 if CPU_CORTEXM3 select CPU_ABRT_NOMMU select CPU_CACHE_NOP select CPU_PABRT_LEGACY select CPU_THUMBONLY +# ARM CortexM3 +config CPU_CORTEXM3 + bool + select CPU_V7M + config CPU_THUMBONLY bool # There are no CPUs available with MMU that don't implement an ARM ISA: @@ -457,6 +463,9 @@ config CPU_32v7 config CPU_32v7M bool +config CPU_32v7M3 + bool + # The abort model config CPU_ABRT_NOMMU bool -- 2.3.6 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
