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