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visionfive2: add initial kernel support

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This commit is contained in:
Andreas Cord-Landwehr
2023-01-07 15:31:02 +01:00
committed by Khem Raj
parent 9710130a4e
commit a7f82e4ab7
2 changed files with 73 additions and 2 deletions
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20
recipes-kernel/linux/linux-starfive-dev.bb
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@@ -6,17 +6,33 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=6bc538ed5bd9a7fc9398086aedcd7e46"
KERNEL_VERSION_SANITY_SKIP = "1"
SRCREV = "${AUTOREV}"
# pin srcrev for now to have a fixed target
# release v2.6.0
SRCREV:visionfive2 = "162a9afb0b009393f4f21ee8c20d773131fd6b1e"
BRANCH = "visionfive"
BRANCH:visionfive2 = "JH7110_VisionFive2_devel"
FORK ?= "starfive-tech"
SRC_URI = "git://github.com/${FORK}/linux.git;protocol=https;branch=${BRANCH} \
file://extra.cfg \
file://modules.cfg \
"
SRC_URI:append:beaglev-starlight-jh7100 = " \
file://extra.cfg \
"
SRC_URI:append:visionfive = " \
file://extra.cfg \
"
SRC_URI:append:visionfive2 = " \
file://0004-riscv-fix-build-with-binutils-2.38.patch \
"
LINUX_VERSION ?= "6.2.0"
LINUX_VERSION_EXTENSION:append:beaglev-starlight-jh7100 = "-starlight"
KBUILD_DEFCONFIG:beaglev-starlight-jh7100 = "starfive_jh7100_fedora_defconfig"
KBUILD_DEFCONFIG:visionfive = "visionfive_defconfig"
KBUILD_DEFCONFIG:visionfive2 = "starfive_visionfive2_defconfig"
COMPATIBLE_MACHINE = "(beaglev-starlight-jh7100|visionfive)"
COMPATIBLE_MACHINE = "(beaglev-starlight-jh7100|visionfive|visionfive2)"

55
recipes-kernel/linux/linux-starfive/0004-riscv-fix-build-with-binutils-2.38.patch Normal file
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@@ -0,0 +1,55 @@
From 46602fe7729b285a823a1bab49d5f77e643be021 Mon Sep 17 00:00:00 2001
From: Cezary Sobczak <cezary.sobczak@3mdeb.com>
Date: Wed, 23 Mar 2022 23:34:37 +0100
Subject: [PATCH] riscv: fix build with binutils 2.38
Original source of this patch:
- https://lore.kernel.org/lkml/YgVRu9Z0BDyJdjR5@kroah.com/T/
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:
CC arch/riscv/kernel/vdso/vgettimeofday.o
<<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h: Assembler messages:
<<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01'
<<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01'
<<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01'
<<BUILDDIR>>/arch/riscv/include/asm/vdso/gettimeofday.h:71: Error: unrecognized opcode `csrr a5,0xc01'
The fix is to specify those extensions explicitely in -march. However as
older binutils version do not support this, we first need to detect
that.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Cezary Sobczak <cezary.sobczak@3mdeb.com>
---
arch/riscv/Makefile | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 8a107ed18b0d..7d81102cffd4 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -50,6 +50,12 @@ 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)
--
2.25.1