@@ -24,7 +24,12 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
CMODEL = medany
endif
-ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
+# Newer binutils versions default to ISA spec version 20191213 which moves some
+# instructions from the I extension to the Zicsr and Zifencei extensions.
+toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C)_zicsr_zifencei)
+zicsr_zifencei-$(toolchain-need-zicsr-zifencei) := _zicsr_zifencei
+
+ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C)$(zicsr_zifencei-y) -mabi=$(ABI) \
-mcmodel=$(CMODEL)
PLATFORM_CPPFLAGS += $(ARCH_FLAGS)
From version 2.38, binutils default to ISA spec version 20191213. This means that the csr read/write (csrr*/csrw*) instructions and fence.i instruction has separated from the `I` extension, become two standalone extensions: Zicsr and Zifencei. The fix is to specify those extensions explicitly in -march. However as older binutils version do not support this, we first need to detect that. Fixes arch/riscv/lib/cache.c: Assembler messages: arch/riscv/lib/cache.c:12: Error: unrecognized opcode `fence.i' Signed-off-by: Khem Raj <raj.khem@gmail.com> Cc: Rick Chen <rick@andestech.com> Cc: Leo <ycliang@andestech.com> --- arch/riscv/Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)