[Buildroot] [PATCH] configs/qemu_riscv32_nommu_virt_defconfig: New defconfig

[Buildroot] [PATCH] configs/qemu_riscv32_nommu_virt_defconfig: New defconfig

[Waldemar Brodkorb]

Add new defconfig for Qemu RISCV32 w/o MMU.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
---
 DEVELOPERS                                 |  2 ++
 arch/Config.in.riscv                       |  3 +--
 board/qemu/riscv32-virt/linux-nommu.config | 21 +++++++++++++++
 board/qemu/riscv32-virt/readme.txt         |  2 ++
 configs/qemu_riscv32_nommu_virt_defconfig  | 30 ++++++++++++++++++++++
 package/Makefile.in                        |  4 +--
 6 files changed, 58 insertions(+), 4 deletions(-)
 create mode 100644 board/qemu/riscv32-virt/linux-nommu.config
 create mode 100644 configs/qemu_riscv32_nommu_virt_defconfig

diff --git a/DEVELOPERS b/DEVELOPERS
index cb8a69a36a..3f14ce338b 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -3192,6 +3192,8 @@ N:	Wade Berrier <wberrier@gmail.com>
 F:	package/ngrep/
 
 N:	Waldemar Brodkorb <wbx@openadk.org>
+F:	board/qemu/riscv32-virt/
+F:	configs/qemu_riscv32_nommu_virt_defconfig
 F:	package/asterisk/
 F:	package/libjwt/
 F:	package/mksh/
diff --git a/arch/Config.in.riscv b/arch/Config.in.riscv
index d62e4ebc6c..3461f75800 100644
--- a/arch/Config.in.riscv
+++ b/arch/Config.in.riscv
@@ -51,7 +51,6 @@ choice
 
 config BR2_RISCV_32
 	bool "32-bit"
-	select BR2_USE_MMU
 
 config BR2_RISCV_64
 	bool "64-bit"
@@ -62,7 +61,7 @@ endchoice
 config BR2_RISCV_USE_MMU
 	bool "MMU support"
 	default y
-	depends on BR2_RISCV_64
+	depends on BR2_RISCV_64 || BR2_RISCV_32
 	select BR2_USE_MMU
 	help
 	  Enable this option if your RISC-V core has a MMU (Memory
diff --git a/board/qemu/riscv32-virt/linux-nommu.config b/board/qemu/riscv32-virt/linux-nommu.config
new file mode 100644
index 0000000000..784b12f18a
--- /dev/null
+++ b/board/qemu/riscv32-virt/linux-nommu.config
@@ -0,0 +1,21 @@
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_MMU is not set
+CONFIG_SOC_VIRT=y
+CONFIG_NONPORTABLE=y
+CONFIG_ARCH_RV32I=y
+CONFIG_BINFMT_FLAT=y
+CONFIG_SLOB=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_VIRTIO_NET=y
+CONFIG_EXT2_FS=y
+CONFIG_PRINTK_TIME=y
diff --git a/board/qemu/riscv32-virt/readme.txt b/board/qemu/riscv32-virt/readme.txt
index 32b4333512..555924f949 100644
--- a/board/qemu/riscv32-virt/readme.txt
+++ b/board/qemu/riscv32-virt/readme.txt
@@ -2,4 +2,6 @@ Run Linux in emulation with:
 
   qemu-system-riscv32 -M virt -bios output/images/fw_jump.elf -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic # qemu_riscv32_virt_defconfig
 
+  qemu-system-riscv32 -M virt -bios none -kernel output/images/Image -append "rootwait root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -nographic -cpu rv32,mmu=off -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 # qemu_riscv32_nommu_virt_defconfig
+
 The login prompt will appear in the terminal that started Qemu.
diff --git a/configs/qemu_riscv32_nommu_virt_defconfig b/configs/qemu_riscv32_nommu_virt_defconfig
new file mode 100644
index 0000000000..4225a1b3b9
--- /dev/null
+++ b/configs/qemu_riscv32_nommu_virt_defconfig
@@ -0,0 +1,30 @@
+# Architecture
+BR2_riscv=y
+BR2_RISCV_32=y
+# BR2_RISCV_USE_MMU is not set
+
+# Linux headers same as kernel
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
+
+# System
+BR2_SYSTEM_DHCP="eth0"
+BR2_TARGET_GENERIC_GETTY=y
+
+# Filesystem
+BR2_TARGET_ROOTFS_EXT2=y
+
+# Image
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/qemu/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_DEFCONFIG)"
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.6.18"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/riscv32-virt/linux-nommu.config"
+BR2_LINUX_KERNEL_IMAGE=y
+
+# host-qemu for gitlab testing
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
diff --git a/package/Makefile.in b/package/Makefile.in
index 3e276d23d6..2d9908b199 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -43,7 +43,7 @@ GNU_TARGET_NAME = $(ARCH)-$(TARGET_VENDOR)-$(TARGET_OS)-$(LIBC)$(ABI)
 
 # FLAT binary format needs uclinux, except RISC-V 64-bits which needs
 # the regular linux name.
-ifeq ($(BR2_BINFMT_FLAT):$(BR2_RISCV_64),y:)
+ifeq ($(BR2_BINFMT_FLAT):$(BR2_riscv),y:)
 TARGET_OS = uclinux
 else
 TARGET_OS = linux
@@ -181,7 +181,7 @@ TARGET_CXXFLAGS += -fno-dwarf2-cfi-asm
 endif
 
 ifeq ($(BR2_BINFMT_FLAT),y)
-ifeq ($(BR2_RISCV_64),y)
+ifeq ($(BR2_riscv),y)
 TARGET_CFLAGS += -fPIC
 endif
 ifeq ($(BR2_BINFMT_FLAT_ONE),y)
-- 
2.30.2

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Re: [Buildroot] [PATCH] configs/qemu_riscv32_nommu_virt_defconfig: New defconfig

[Thomas Petazzoni via buildroot]

Hello Waldemar,

On Sat, 11 May 2024 09:46:07 +0200
Waldemar Brodkorb <wbx@openadk.org> wrote:

> Add new defconfig for Qemu RISCV32 w/o MMU.
> 
> Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

Nice stuff!

Could you split this commit into two, one enabling RISC-V 32-bit noMMU,
and another adding the defconfig?

Also, in the patch adding the defconfig, fix the following
check-package warning:

WARNING: configs/qemu_riscv32_nommu_virt_defconfig:0: missing BR2_DOWNLOAD_FORCE_CHECK_HASHES

(we require this for new defconfigs)

Minor detail, the commit title should be:

	configs/qemu_riscv32_nommu_virt: new defconfig

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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