On 2020-04-09 16:25, Sicris Rey Embay wrote:
On Thu, Apr 9, 2020 at 8:49 PM Heinrich Schuchardt xypron.glpk@gmx.de wrote:
On 2020-04-08 17:39, Sicris wrote:
This patch fixes the typo error in Makefile where -I$(srctree)/arch/$(ARCH)/thumb1/include is not picked up in the compiler flag when compiling for thumb2. END
Signed-off-by: Sicris sicris.embay@gmail.com
Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile index 8de5ff6d94..503b30392d 100644 --- a/Makefile +++ b/Makefile @@ -704,7 +704,7 @@ UBOOTINCLUDE := \ -Iinclude \ $(if $(KBUILD_SRC), -I$(srctree)/include) \ $(if $(CONFIG_$(SPL_)SYS_THUMB_BUILD), \
$(if $(CONFIG_HAS_THUMB2),, \
$(if $(CONFIG_HAS_THUMB2), \ -I$(srctree)/arch/$(ARCH)/thumb1/include),) \This patch relates to https://stackoverflow.com/questions/61097841/error-selected-processor-does-n...
The original problem was using the wrong compiler as discussed on Stackoverflow.
Sorry, I was not very clear on the problem that I've encountered.
I tried the M-profile as suggested in the stackoverflow comment from Frant. However, I still get the same error with CONFIG_CMD_UBI=y.
{standard input}:757: Error: selected processor does not support requested special purpose register – msr cpsr_c,r3
This is due to the assembly inline function local_irq_save() / local_irq_restore. On closer inspection, the wrong header for local_irq_save / local_irq_restore was picked up by the compiler.
Wrong Header: /arch/arm/include/asm/proc-armv/system.h (Closest i can find) Correct Header: /arch/arm/thumb1/include/asm/proc-armv/system.h
Compiling stm32f769-disco_defconfig works fine using the Debian Bullseye package gcc-arm-linux-gnueabi without this patch.
Can you help me check if this compiles using Debian Bullseye with CONFIG_CMD_UBI=y?
With this selected compiling fails.
{standard input}:965: Error: selected processor does not support requested special purpose register -- `mrs r1,cpsr'
The CPSR register is not present on ARMv6-M and ARMv7-M processors.
So on these architectures arch/arm/include/asm/proc-armv/system.h has to be replaced by arch/arm/thumb1/include/asm/proc-armv/system.h.
The current logic is: If it is thumb and not thumb2, include the thumb1 directory. If it is thumb and thumb2, do not include the thumb1 directory.
You are inverting the logic with your patch:
If it is thumb and thumb2, include the thumb1 directory. If it is thumb and not thumb2, do not include the thumb1 directory.
This does not make much sense to me.
Does this suggestion make sense?
$(if $(CONFIG_HAS_THUMB2), \ -I$(srctree)/arch/$(ARCH)/thumb2/include), -I$(srctree)/arch/$(ARCH)/thumb1/include),) \
We do not want to use a special include on ARMv7-A even if building in thumbs mode. So we should explicitly check the CPU architecture here.
If CONFIG_HAS_THUMB2 is undefined or CONFIG_CPU_V7M is defined, we should use -I$(srctree)/arch/$(ARCH)/thumb1/include.
--- a/Makefile +++ b/Makefile @@ -701,13 +701,15 @@ KBUILD_CFLAGS += $(KCFLAGS) # Use UBOOTINCLUDE when you must reference the include/ directory. # Needed to be compatible with the O= option -UBOOTINCLUDE := \ - -Iinclude \ - $(if $(KBUILD_SRC), -I$(srctree)/include) \ - $(if $(CONFIG_$(SPL_)SYS_THUMB_BUILD), \ - $(if $(CONFIG_HAS_THUMB2),, \ - -I$(srctree)/arch/$(ARCH)/thumb1/include),) \ - -I$(srctree)/arch/$(ARCH)/include \ - -include $(srctree)/include/linux/kconfig.h +UBOOTINCLUDE := \ + -Iinclude \ + $(if $(KBUILD_SRC), -I$(srctree)/include) \ + $(if $(CONFIG_$(SPL_)SYS_THUMB_BUILD), \ + $(if $(CONFIG_HAS_THUMB2), \ + $(if $(CONFIG_CPU_V7M), \ + -I$(srctree)/arch/arm/thumb1/include), \ + -I$(srctree)/arch/arm/thumb1/include)) \ + -I$(srctree)/arch/$(ARCH)/include \ + -include $(srctree)/include/linux/kconfig.h
Best regards
Heinrich
with thumb2/include contains the same thumb1/include contents.
For understanding the if-statement I found the following Makefile useful:
all: $(if ,,echo 1) $(if ,echo 2) $(if 1,,echo 3) $(if 1,echo 4)
The output contains 1 and 4.
Best regards
Heinrich
-I$(srctree)/arch/$(ARCH)/include \ -include $(srctree)/include/linux/kconfig.hcheers, Sicris Rey