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For grub-efi we can align the rootfs to start at exactly 16MB from the beginning of the disk. This can be done by reducing the vfat partition to be 32 KB smaller than its 16MB size, just like the offset of the vfat partition. Signed-off-by: Florian La Roche <Florian.LaRoche@gmail.com> [Peter: drop redundant offset/size settings, add comment] Signed-off-by: Peter Korsgaard <peter@korsgaard.com> |
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| .. | ||
| genimage-bios.cfg | ||
| genimage-efi.cfg | ||
| grub-bios.cfg | ||
| grub-efi.cfg | ||
| linux.config | ||
| post-build.sh | ||
| post-image-efi.sh | ||
| readme.txt | ||
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 .