litmusautomation/meta-efibootguard

Yocto layer for EFI Boot Guard

EFI Boot Guard meta layer

A meta-layer for integration of efibootguard into a yocto project.

Development

Mailing list: efibootguard-dev@googlegroups.com

Archive: https://www.mail-archive.com/efibootguard-dev@googlegroups.com

Current status

Tested with:

poky (rocko): 16e22f3e37788afb83044f5089d24187d70094bd https://git.yoctoproject.org/git/poky

meta-intel: aa246ba9855d35d454ddcf041578310cbaa90250 https://git.yoctoproject.org/git/meta-intel

meta-openembedded: 29a4983d5a4462d8e7b9abcd55bfb3013f578fdd http://git.openembedded.org/meta-openembedded

project integration

Steps:

1. Include this meta layer into your project

2. Set EFI_PROVIDER to "efibootguard" in your local.conf or in your conf/machine/<MACHINE>.conf:

EFI_PROVIDER="efibootguard"

3. Provide a project-specific .wks file using the python source plugins of this layer for image creation

4. Build the roots and the hdd image using the new .wks file

Example .wks file

# short-description: Create a bootable disk image with efibootguard
# long-description: Creates a partitioned EFI disk image,
# using efibootguard, that the user can directly dd to boot media.

# EFI partition containing efibootguard
part --source efibootguard-efi --size 32 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --label efi --part-type=EF00 --align 1024

# Two root partitions for updateability, leave away 2nd if not used
part / --source rootfs --size 1024 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --fstype=ext4 --label platform0 --align 1024
part --source rootfs --size 1024 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --fstype=ext4 --label plaftorm1 --align 1024

# Two config partitions to load boot configuration and kernel
part --source efibootguard-boot --size 32 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --label boot0 --align 1024 --part-type=0700 --sourceparams "watchdog=60,revision=2"
part --source efibootguard-boot --size 32 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --label boot1 --align 1024 --part-type=0700 --sourceparams "watchdog=60,revision=1"

# Other partitions
part --size 1024 --extra-space 0 --overhead-factor 1 --ondisk mmcblk0 --label persistent --align 1024 --fstype=ext4
part swap --ondisk mmcblk0 --size 512 --fstype=swap --label swap --align 1024

# Important for type of partition table
bootloader --ptable gpt --append="console=ttyS1,115200n8 reboot=efi,warm rw debugshell=5 rootwait"

NOTE: The --append option to the bootloader gives kernel parameters that are written into the efibootguard environment file.