[PATCH 1/1] The riscv spec has breaking change from 2.2 to 20191213. Both ZICSR and ZIFENCEI are separated extension since 20191213. Gcc bump up the riscv spec to 20191213 since 12.x. So add below 4 build option for compatibility::

[Pan Li <incarnation.p.lee@outlook.com>]

CONFIG_RISCV_ISA_F for single float point, default no.
CONFIG_RISCV_ISA_D for double float point, default no.
CONFIG_RISCV_ISA_ZICSR for control and status register, default no.
CONFIG_RISCV_ISA_ZIFENCEI for instruction-fetch fence, default no.

Example when build with gcc 12.x as below.

    make qemu-riscv64_defconfig && make \
        CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv \
        CONFIG_RISCV_ISA_F=y \
        CONFIG_RISCV_ISA_D=y \
        CONFIG_RISCV_ISA_ZICSR=y \
        CONFIG_RISCV_ISA_ZIFENCEI=y

Signed-off-by: Pan Li <incarnation.p.lee@outlook.com>
---

 arch/riscv/Kconfig  | 28 ++++++++++++++++++++++++++++
 arch/riscv/Makefile | 20 ++++++++++++++++++--
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 78e964db12..d54ee3aaf3 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -144,6 +144,34 @@ config SPL_RISCV_SMODE
 
 endchoice
 
+config RISCV_ISA_F
+	bool "Single precision instructions"
+	help
+	  Adds "F" to the ISA subsets that the toolchain is allowed to emit
+	  when building U-Boot, which results in single precision floating point
+	  instructions in the U-Boot binary.
+
+config RISCV_ISA_D
+	bool "Double precision instructions"
+	help
+	  Adds "D" to the ISA subsets that the toolchain is allowed to emit
+	  when building U-Boot, which results in double precision floating point
+	  instructions in the U-Boot binary.
+
+config RISCV_ISA_ZICSR
+	bool "Control and status register instructions"
+	help
+	  Adds "ZICSR" to the ISA subsets that the toolchain is allowed to emit
+	  when building U-Boot, which results in control and status Register
+	  instructions in the U-Boot binary, since gcc 12.x and riscv spec 20191213.
+
+config RISCV_ISA_ZIFENCEI
+	bool "Instruction-fetch fence instructions"
+	help
+	  Adds "ZIFENCEI" to the ISA subsets that the toolchain is allowed to emit
+	  when building U-Boot, which results in instruction-fetch fence instructions
+	  in the U-Boot binary, since gcc 12.x and riscv spec 20191213.
+
 config RISCV_ISA_C
 	bool "Emit compressed instructions"
 	default y
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 0b80eb8d86..d333af92d1 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -14,9 +14,25 @@ endif
 ifeq ($(CONFIG_RISCV_ISA_A),y)
 	ARCH_A = a
 endif
+ifeq ($(CONFIG_RISCV_ISA_F),y)
+	ARCH_F = f
+ifneq ($(CONFIG_RISCV_ISA_D),y)
+	ABI_FP_SUFFIX = $(ARCH_F)
+endif
+endif
+ifeq ($(CONFIG_RISCV_ISA_D),y)
+	ARCH_D = d
+	ABI_FP_SUFFIX = $(ARCH_D)
+endif
 ifeq ($(CONFIG_RISCV_ISA_C),y)
 	ARCH_C = c
 endif
+ifeq ($(CONFIG_RISCV_ISA_ZICSR),y)
+	ARCH_ZICSR = _zicsr
+endif
+ifeq ($(CONFIG_RISCV_ISA_ZIFENCEI),y)
+	ARCH_ZIFENCEI = _zifencei
+endif
 ifeq ($(CONFIG_CMODEL_MEDLOW),y)
 	CMODEL = medlow
 endif
@@ -24,8 +40,8 @@ ifeq ($(CONFIG_CMODEL_MEDANY),y)
 	CMODEL = medany
 endif
 
-ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_C) -mabi=$(ABI) \
-	     -mcmodel=$(CMODEL)
+ARCH_FLAGS = -march=$(ARCH_BASE)$(ARCH_A)$(ARCH_F)$(ARCH_D)$(ARCH_C)$(ARCH_ZICSR)$(ARCH_ZIFENCEI) \
+	-mabi=$(ABI)$(ABI_FP_SUFFIX) -mcmodel=$(CMODEL)
 
 PLATFORM_CPPFLAGS	+= $(ARCH_FLAGS)
 CFLAGS_EFI		+= $(ARCH_FLAGS)
-- 
2.34.1