[Buildroot] [PATCH] configs/beaglev_defconfig: fix build with binutils >= 2.38

[Romain Naour]

Backport an upstream patch fixing the build with binutils >= 2.38
for riscv's for Zicsr and Zifencei.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/4987456149

Signed-off-by: Romain Naour <romain.naour at gmail.com>
---
 ...iscv-Fix-build-against-binutils-2.38.patch | 58 +++++++++++++++++++
 configs/beaglev_defconfig                     |  1 +
 2 files changed, 59 insertions(+)
 create mode 100644 board/beaglev/patches/uboot/0001-riscv-Fix-build-against-binutils-2.38.patch

diff --git a/board/beaglev/patches/uboot/0001-riscv-Fix-build-against-binutils-2.38.patch b/board/beaglev/patches/uboot/0001-riscv-Fix-build-against-binutils-2.38.patch
new file mode 100644
index 0000000000..52b496f054
--- /dev/null
+++ b/board/beaglev/patches/uboot/0001-riscv-Fix-build-against-binutils-2.38.patch
@@ -0,0 +1,58 @@
+From 0cf11f3c0478f4286adcfb09bf9137f8b00212e3 Mon Sep 17 00:00:00 2001
+From: Alexandre Ghiti <alexandre.ghiti at canonical.com>
+Date: Mon, 3 Oct 2022 18:07:54 +0200
+Subject: [PATCH] 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 at canonical.com>
+Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
+Tested-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
+Tested-by: Heiko Stuebner <heiko at sntech.de>
+Tested-by: Christian Stewart <christian at paral.in>
+Reviewed-by: Rick Chen <rick at andestech.com>
+(cherry picked from commit 1dde977518f13824b847e23275001191139bc384)
+Upstream: https://gitlab.com/u-boot/u-boot/-/commit/1dde977518f13824b847e23275001191139bc384
+Signed-off-by: Romain Naour <romain.naour at gmail.com>
+---
+ arch/riscv/Makefile | 11 ++++++++++-
+ 1 file changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
+index 0b80eb8d864..53d1194ffb6 100644
+--- 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	+= $(ARCH_FLAGS)
+-- 
+2.41.0
+
diff --git a/configs/beaglev_defconfig b/configs/beaglev_defconfig
index 42c732b973..a76c1ffb5f 100644
--- a/configs/beaglev_defconfig
+++ b/configs/beaglev_defconfig
@@ -40,3 +40,4 @@ BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,starfive-tech,u-boot,64e
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="starfive_vic7100_beagle_v_smode"
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_JH71XX_TOOLS=y
+BR2_GLOBAL_PATCH_DIR="board/beaglev/patches"
-- 
2.41.0