| Notes on using Grub2 for BIOS-based platforms |
| ============================================= |
| |
| 1. Create a disk image |
| dd if=/dev/zero of=disk.img bs=1M count=32 |
| 2. Partition it (either legacy or GPT style partitions work) |
| cfdisk disk.img |
| - Create one partition, type Linux, for the root |
| filesystem. The only constraint is to make sure there |
| is enough free space *before* the first partition to |
| store Grub2. Leaving 1 MB of free space is safe. |
| 3. Setup loop device and loop partitions |
| sudo losetup -f disk.img |
| sudo partx -a /dev/loop0 |
| 4. Prepare the root partition |
| sudo mkfs.ext3 -L root /dev/loop0p1 |
| sudo mount /dev/loop0p1 /mnt |
| sudo tar -C /mnt -xf output/images/rootfs.tar |
| sudo umount /mnt |
| 5. Install Grub2 |
| sudo ./output/host/sbin/grub-bios-setup \ |
| -b ./output/host/lib/grub/i386-pc/boot.img \ |
| -c ./output/images/grub.img -d . /dev/loop0 |
| 6. Cleanup loop device |
| sudo partx -d /dev/loop0 |
| sudo losetup -d /dev/loop0 |
| 7. Your disk.img is ready! |
| |
| Using genimage |
| -------------- |
| |
| If you use genimage to generate your complete image, |
| installing Grub can be tricky. Here is how to achieve Grub's |
| installation with genimage: |
| |
| partition boot { |
| in-partition-table = "no" |
| image = "path_to_boot.img" |
| offset = 0 |
| size = 512 |
| } |
| partition grub { |
| in-partition-table = "no" |
| image = "path_to_grub.img" |
| offset = 512 |
| } |
| |
| The result is not byte to byte identical to what |
| grub-bios-setup does but it works anyway. |
| |
| To test your BIOS image in Qemu |
| ------------------------------- |
| |
| qemu-system-{i386,x86-64} -hda disk.img |
| |
| Notes on using Grub2 for EFI-based platforms |
| ============================================ |
| |
| 1. Create a disk image |
| dd if=/dev/zero of=disk.img bs=1M count=32 |
| 2. Partition it with GPT partitions |
| cgdisk disk.img |
| - Create a first partition, type EF00, for the |
| bootloader and kernel image |
| - Create a second partition, type 8300, for the root |
| filesystem. |
| 3. Setup loop device and loop partitions |
| sudo losetup -f disk.img |
| sudo partx -a /dev/loop0 |
| 4. Prepare the boot partition |
| sudo mkfs.vfat -n boot /dev/loop0p1 |
| sudo mount /dev/loop0p1 /mnt |
| sudo cp -a output/images/efi-part/* /mnt/ |
| sudo cp output/images/bzImage /mnt/ |
| sudo umount /mnt |
| 5. Prepare the root partition |
| sudo mkfs.ext3 -L root /dev/loop0p2 |
| sudo mount /dev/loop0p2 /mnt |
| sudo tar -C /mnt -xf output/images/rootfs.tar |
| sudo umount /mnt |
| 6 Cleanup loop device |
| sudo partx -d /dev/loop0 |
| sudo losetup -d /dev/loop0 |
| 7. Your disk.img is ready! |
| |
| To test your EFI image in Qemu |
| ------------------------------ |
| |
| 1. Download the EFI BIOS for Qemu |
| Version IA32 or X64 depending on the chosen Grub2 |
| platform (i386-efi vs. x86-64-efi) |
| http://sourceforge.net/projects/edk2/files/OVMF/ |
| 2. Extract, and rename OVMF.fd to bios.bin and |
| CirrusLogic5446.rom to vgabios-cirrus.bin. |
| 3. qemu-system-{i386,x86-64} -L ovmf-dir/ -hda disk.img |
| 4. Make sure to pass pci=nocrs to the kernel command line, |
| to workaround a bug in the EFI BIOS regarding the |
| EFI framebuffer. |