[PATCH 4/7] starfive-visionfive2: add BSP kernel

[Felix Moessbauer <felix.moessbauer@siemens.com>]

This patch adds the kernel (including configuration) from the
SDK package. To make this kernel build on gcc12, we add a patch
that fixes the machine model.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 ...or-unrecognized-opcode-csrr-a5-0xc01.patch | 26 +++++++++++++++++++
 .../linux/linux-starfive_5.15-visionfive2.bb  | 17 ++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 meta-isar/recipes-kernel/linux/files/fix-Error-unrecognized-opcode-csrr-a5-0xc01.patch
 create mode 100644 meta-isar/recipes-kernel/linux/linux-starfive_5.15-visionfive2.bb

diff --git a/meta-isar/recipes-kernel/linux/files/fix-Error-unrecognized-opcode-csrr-a5-0xc01.patch b/meta-isar/recipes-kernel/linux/files/fix-Error-unrecognized-opcode-csrr-a5-0xc01.patch
new file mode 100644
index 00000000..b4dcaf0d
--- /dev/null
+++ b/meta-isar/recipes-kernel/linux/files/fix-Error-unrecognized-opcode-csrr-a5-0xc01.patch
@@ -0,0 +1,26 @@
+From 2f75442523e4b44bdea4ae5bc2e95137d0303c8b Mon Sep 17 00:00:00 2001
+From: LIChengGang <43427321+Zeno-sole@users.noreply.github.com>
+Date: Thu, 12 Jan 2023 10:52:05 +0800
+Subject: [PATCH] fix: Error unrecognized opcode `csrr a5,0xc01
+
+---
+ arch/riscv/Makefile | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
+index 0eb4568fbd290..c18d87212177b 100644
+--- a/arch/riscv/Makefile
++++ b/arch/riscv/Makefile
+@@ -52,6 +52,12 @@ riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
+ riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
+ riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
+ riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)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 := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
++riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
++
+ KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
+ KBUILD_AFLAGS += -march=$(riscv-march-y)
+ 
diff --git a/meta-isar/recipes-kernel/linux/linux-starfive_5.15-visionfive2.bb b/meta-isar/recipes-kernel/linux/linux-starfive_5.15-visionfive2.bb
new file mode 100644
index 00000000..bf4a1de5
--- /dev/null
+++ b/meta-isar/recipes-kernel/linux/linux-starfive_5.15-visionfive2.bb
@@ -0,0 +1,17 @@
+#
+# Copyright (c) Siemens AG, 2023
+#
+# SPDX-License-Identifier: MIT
+
+require recipes-kernel/linux/linux-custom.inc
+
+SRC_URI += " \
+    git://github.com/starfive-tech/linux.git;protocol=https;branch=JH7110_VisionFive2_devel;destsuffix=linux-visionfive-${PV} \
+    file://fix-Error-unrecognized-opcode-csrr-a5-0xc01.patch"
+SRCREV = "59cf9af678dbfa3d73f6cb86ed1ae7219da9f5c9"
+
+S = "${WORKDIR}/linux-visionfive-${PV}"
+
+KERNEL_DEFCONFIG = "starfive_visionfive2_defconfig"
+
+LINUX_VERSION_EXTENSION = "-isar"
-- 
2.34.1