initial buildroot for linux 5.15

board/pc/genimage-bios.cfg

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+image disk.img {
+	hdimage {
+	}
+
+	partition boot {
+		in-partition-table = "no"
+		image = "boot.img"
+		offset = 0
+		size = 512
+	}
+
+	partition grub {
+		in-partition-table = "no"
+		image = "grub.img"
+		offset = 512
+	}
+
+	partition root {
+		partition-type = 0x83
+		image = "rootfs.ext2"
+	}
+}

board/pc/genimage-efi.cfg

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+image efi-part.vfat {
+	vfat {
+		file EFI {
+			image = "efi-part/EFI"
+		}
+
+		file bzImage {
+			image = "bzImage"
+		}
+	}
+
+	size = 16352K # 16MB - 32KB
+}
+
+image disk.img {
+	hdimage {
+		gpt = true
+	}
+
+	partition boot {
+		image = "efi-part.vfat"
+		partition-type-uuid = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
+		offset = 32K
+		bootable = true
+	}
+
+	partition root {
+		partition-type-uuid = 44479540-f297-41b2-9af7-d131d5f0458a
+		partition-uuid = UUID_TMP
+		image = "rootfs.ext2"
+	}
+}

board/pc/grub-bios.cfg

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+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+	linux /boot/bzImage root=/dev/sda1 rootwait console=tty1
+}

board/pc/grub-efi.cfg

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+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+ linux /bzImage root=PARTUUID=UUID_TMP rootwait console=tty1
+}

board/pc/linux.config

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+CONFIG_SYSVIPC=y
+CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
+CONFIG_SMP=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_EFI=y
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_NETFILTER=y
+CONFIG_IP_NF_IPTABLES=y
+CONFIG_IP_NF_FILTER=y
+CONFIG_CFG80211=m
+CONFIG_CFG80211_WEXT=y
+CONFIG_MAC80211=m
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_BLK_DEV_SD=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_ATA=y
+CONFIG_ATA_PIIX=y
+CONFIG_NETDEVICES=y
+CONFIG_VIRTIO_NET=y
+CONFIG_ATL2=m
+CONFIG_ATL1=m
+CONFIG_ATL1E=m
+CONFIG_ATL1C=m
+CONFIG_ALX=m
+CONFIG_E100=m
+CONFIG_E1000=m
+CONFIG_E1000E=m
+CONFIG_IGB=m
+CONFIG_NE2K_PCI=y
+CONFIG_8139CP=y
+CONFIG_R8169=m
+CONFIG_ATH9K=m
+CONFIG_ATH9K_HTC=m
+CONFIG_CARL9170=m
+CONFIG_ATH10K=m
+CONFIG_ATH10K_PCI=m
+CONFIG_IWL4965=m
+CONFIG_IWL3945=m
+CONFIG_IWLWIFI=m
+CONFIG_RT2X00=m
+CONFIG_RT2800PCI=m
+CONFIG_RT73USB=m
+CONFIG_RT2800USB=m
+CONFIG_RT2800USB_RT3573=y
+CONFIG_RT2800USB_RT53XX=y
+CONFIG_RT2800USB_RT55XX=y
+# CONFIG_RTL_CARDS is not set
+CONFIG_RTL8XXXU=m
+CONFIG_INPUT_EVDEV=y
+CONFIG_SERIAL_8250=y
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_HW_RANDOM_VIRTIO=m
+CONFIG_DRM=y
+CONFIG_DRM_I915=y
+CONFIG_DRM_QXL=y
+CONFIG_DRM_BOCHS=y
+CONFIG_DRM_VIRTIO_GPU=y
+CONFIG_FB_VESA=y
+CONFIG_SOUND=y
+CONFIG_SND=y
+CONFIG_SND_HDA_INTEL=y
+CONFIG_SND_HDA_GENERIC=y
+CONFIG_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_UHCI_HCD=y
+CONFIG_USB_STORAGE=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_BALLOON=y
+CONFIG_VIRTIO_INPUT=y
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_EXT4_FS=y
+CONFIG_FUSE_FS=y
+CONFIG_TMPFS_POSIX_ACL=y
+CONFIG_SQUASHFS=y
+CONFIG_UNWINDER_FRAME_POINTER=y

board/pc/post-build.sh

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+#!/bin/sh
+
+set -e
+
+BOARD_DIR=$(dirname "$0")
+
+# Detect boot strategy, EFI or BIOS
+if [ -d "$BINARIES_DIR/efi-part/" ]; then
+    cp -f "$BOARD_DIR/grub-efi.cfg" "$BINARIES_DIR/efi-part/EFI/BOOT/grub.cfg"
+else
+    cp -f "$BOARD_DIR/grub-bios.cfg" "$TARGET_DIR/boot/grub/grub.cfg"
+
+    # Copy grub 1st stage to binaries, required for genimage
+    cp -f "$TARGET_DIR/lib/grub/i386-pc/boot.img" "$BINARIES_DIR"
+fi

board/pc/post-image-efi.sh

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+#!/bin/sh
+
+set -e
+
+UUID=$(dumpe2fs "$BINARIES_DIR/rootfs.ext2" 2>/dev/null | sed -n 's/^Filesystem UUID: *\(.*\)/\1/p')
+sed -i "s/UUID_TMP/$UUID/g" "$BINARIES_DIR/efi-part/EFI/BOOT/grub.cfg"
+sed "s/UUID_TMP/$UUID/g" board/pc/genimage-efi.cfg > "$BINARIES_DIR/genimage-efi.cfg"
+support/scripts/genimage.sh -c "$BINARIES_DIR/genimage-efi.cfg"

board/pc/readme.txt

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+Bare PC sample config
+=====================
+
+1. Build
+
+  First select the appropriate target you want.
+
+  For BIOS-based boot strategy:
+
+  $ make pc_x86_64_bios_defconfig
+
+  For EFI-based boot strategy on a GPT-partitioned disk:
+
+  $ make pc_x86_64_efi_defconfig
+
+  Add any additional packages required and build:
+
+  $ make
+
+2. Write the pendrive
+
+  The build process will create a pendrive image called sdcard.img in
+  output/images.
+
+  Write the image to a pendrive:
+
+  $ dd if=output/images/disk.img of=/dev/sdc; sync
+
+  Once it's done insert it into the target PC and boot.
+
+  Remember that if said PC has another boot device you might need to
+  select this alternative for it to boot.
+
+  In the case of EFI boot you might need to disable Secure Boot from
+  the setup as well.
+
+3. Enjoy
+
+Emulation in qemu (BIOS)
+========================
+
+1. Edit grub-bios.cfg
+
+  Since the driver will show up in the virtual machine as /dev/vda,
+  change board/pc/grub-bios.cfg to use root=/dev/vda2 instead of
+  root=/dev/sda2. Then rebuild grub2 and the image.
+
+2. Run the emulation with:
+
+qemu-system-x86_64 \
+	-M pc \
+	-drive file=output/images/disk.img,if=virtio,format=raw \
+	-net nic,model=virtio \
+	-net user
+
+
+Emulation in qemu (UEFI)
+========================
+
+Run the emulation with:
+
+qemu-system-x86_64 \
+	-M pc \
+	-bios </path/to/OVMF_CODE.fd> \
+	-drive file=output/images/disk.img,if=virtio,format=raw \
+	-net nic,model=virtio \
+	-net user
+
+Note that </path/to/OVMF.fd> needs to point to a valid x86_64 UEFI
+firmware image for qemu. It may be provided by your distribution as a
+edk2 or OVMF package, in path such as
+/usr/share/edk2/ovmf/OVMF_CODE.fd .