commit 1dde977518f13824b847e23275001191139bc384
Author: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Date:   Mon Oct 3 18:07:54 2022 +0200

    riscv: Fix build against binutils 2.38
    
    The following description is copied from the equivalent patch for the
    Linux Kernel proposed by Aurelien Jarno:
    
    >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. As the kernel uses those instruction,
    this causes the following build failure:
    
    arch/riscv/cpu/mtrap.S: Assembler messages:
    arch/riscv/cpu/mtrap.S:65: Error: unrecognized opcode `csrr a0,scause'
    arch/riscv/cpu/mtrap.S:66: Error: unrecognized opcode `csrr a1,sepc'
    arch/riscv/cpu/mtrap.S:67: Error: unrecognized opcode `csrr a2,stval'
    arch/riscv/cpu/mtrap.S:70: Error: unrecognized opcode `csrw sepc,a0'
    
    Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
    Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
    Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
    Tested-by: Heiko Stuebner <heiko@sntech.de>
    Tested-by: Christian Stewart <christian@paral.in>
    Reviewed-by: Rick Chen <rick@andestech.com>

--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -24,7 +24,16 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
 	CMODEL = medany
 endif
 
-ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
+RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_C)
+
+# 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 := $(call cc-option-yn, -mabi=$(ABI) -march=$(RISCV_MARCH)_zicsr_zifencei)
+ifeq ($(toolchain-need-zicsr-zifencei),y)
+	RISCV_MARCH := $(RISCV_MARCH)_zicsr_zifencei
+endif
+
+ARCH_FLAGS = -march=$(RISCV_MARCH) -mabi=$(ABI) \
 	     -mcmodel=$(CMODEL)
 
 PLATFORM_CPPFLAGS	+= $(ARCH_FLAGS)