configs/pc_x86_64_efi: use a GPT partition table
Since all EFI-based systems support GPT, this commit changes pc_x86_64_efi to use a GPT partition table. It shows an example of how to craft a disk image with GPT partitioning instead of MBR. This is achieved by means of a post-image script which uses mkdosfs+mcopy+sfdisk, since genimage is unable to deal with GPT. Long term, it would be ideal if genimage had GPT support, but until then, this script shows how to achieve creating a GPT-based disk image. The script was kept as simple as possible to make it easy to understand and adapt for other purposes. The root filesystem location is passed to the kernel by a partition UUID, so it is possible to boot on QEMU, directly from the disk image, or dump the image to a physical device. Signed-off-by: Carlos Santos <casantos@datacom.com.br> Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Carlos Santos
Thomas Petazzoni
parent
0febedaf4f
commit
fee29b05bb
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@ -1,31 +0,0 @@
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image efi-part.vfat {
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vfat {
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file startup.nsh {
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image = "efi-part/startup.nsh"
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}
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file EFI {
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image = "efi-part/EFI"
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}
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file bzImage {
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image = "bzImage"
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}
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}
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size = 16M
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}
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image disk.img {
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hdimage {
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}
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partition boot {
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partition-type = 0xEF
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image = "efi-part.vfat"
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}
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partition root {
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partition-type = 0x83
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image = "rootfs.ext2"
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}
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}
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@ -4,12 +4,7 @@ set -e
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BOARD_DIR=$(dirname "$0")
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# Detect boot strategy, EFI or BIOS
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if [ -f "$BINARIES_DIR/efi-part/startup.nsh" ]; then
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cp -f "$BOARD_DIR/grub-efi.cfg" "$BINARIES_DIR/efi-part/EFI/BOOT/grub.cfg"
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else
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cp -f "$BOARD_DIR/grub-bios.cfg" "$TARGET_DIR/boot/grub/grub.cfg"
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cp -f "$BOARD_DIR/grub-bios.cfg" "$TARGET_DIR/boot/grub/grub.cfg"
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# Copy grub 1st stage to binaries, required for genimage
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cp -f "$HOST_DIR/lib/grub/i387-pc/boot.img" "$BINARIES_DIR"
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fi
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# Copy grub 1st stage to binaries, required for genimage
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cp -f "$HOST_DIR/lib/grub/i387-pc/boot.img" "$BINARIES_DIR"
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62
board/pc/post-image-efi-gpt.sh
Executable file
62
board/pc/post-image-efi-gpt.sh
Executable file
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@ -0,0 +1,62 @@
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#!/bin/sh
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set -e
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cd ${BINARIES_DIR}
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# GPT partition type UUIDs
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esp_type=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
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linux_type=44479540-f297-41b2-9af7-d131d5f0458a
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# Partition UUIDs
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efi_part_uuid=$(uuidgen)
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root_part_uuid=$(uuidgen)
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# Boot partition offset and size, in 512-byte sectors
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efi_part_start=64
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efi_part_size=32768
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# Rootfs partition offset and size, in 512-byte sectors
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root_part_start=$(( efi_part_start + efi_part_size ))
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root_part_size=$(( $(stat -c %s rootfs.ext2) / 512 ))
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first_lba=34
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last_lba=$(( root_part_start + root_part_size ))
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# Disk image size in 512-byte sectors
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image_size=$(( last_lba + first_lba ))
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cat > efi-part/EFI/BOOT/grub.cfg <<EOF
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set default="0"
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set timeout="5"
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menuentry "Buildroot" {
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linux /bzImage root=PARTUUID=$root_part_uuid rootwait console=tty1
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}
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EOF
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# Create EFI system partition
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rm -f efi-part.vfat
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dd if=/dev/zero of=efi-part.vfat bs=512 count=0 seek=$efi_part_size
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mkdosfs efi-part.vfat
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mcopy -bsp -i efi-part.vfat efi-part/startup.nsh ::startup.nsh
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mcopy -bsp -i efi-part.vfat efi-part/EFI ::EFI
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mcopy -bsp -i efi-part.vfat bzImage ::bzImage
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rm -f disk.img
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dd if=/dev/zero of=disk.img bs=512 count=0 seek=$image_size
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sfdisk disk.img <<EOF
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label: gpt
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label-id: $(uuidgen)
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device: /dev/foobar0
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unit: sectors
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first-lba: $first_lba
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last-lba: $last_lba
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/dev/foobar0p1 : start=$efi_part_start, size=$efi_part_size, type=$esp_type, uuid=$efi_part_uuid, name="efi-part.vfat"
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/dev/foobar0p2 : start=$root_part_start, size=$root_part_size, type=$linux_type, uuid=$root_part_uuid, name="rootfs.ext2"
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EOF
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dd if=efi-part.vfat of=disk.img bs=512 count=$efi_part_size seek=$efi_part_start conv=notrunc
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dd if=rootfs.ext2 of=disk.img bs=512 count=$root_part_size seek=$root_part_start conv=notrunc
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@ -9,7 +9,7 @@ Bare PC sample config
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$ make pc_x86_64_bios_defconfig
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Or for EFI:
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For EFI-based boot strategy on a GPT-partitioned disk:
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$ make pc_x86_64_efi_defconfig
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@ -10,7 +10,6 @@ BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
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# Required tools to create bootable media
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BR2_PACKAGE_HOST_DOSFSTOOLS=y
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BR2_PACKAGE_HOST_GENIMAGE=y
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BR2_PACKAGE_HOST_MTOOLS=y
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# Bootloader
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@ -22,9 +21,7 @@ BR2_TARGET_ROOTFS_EXT2=y
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BR2_TARGET_ROOTFS_EXT2_4=y
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BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
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# BR2_TARGET_ROOTFS_TAR is not set
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BR2_ROOTFS_POST_BUILD_SCRIPT="board/pc/post-build.sh"
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BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
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BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/pc/genimage-efi.cfg"
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BR2_ROOTFS_POST_IMAGE_SCRIPT="board/pc/post-image-efi-gpt.sh"
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# Linux headers same as kernel, a 4.18 series
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BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_18=y
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