c24fdb3680
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
121 lines
3.9 KiB
Plaintext
121 lines
3.9 KiB
Plaintext
config BR2_TARGET_GRUB2
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bool "grub2"
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depends on BR2_i386 || BR2_x86_64
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help
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GNU GRUB is a Multiboot boot loader. It was derived from
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GRUB, the GRand Unified Bootloader, which was originally
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designed and implemented by Erich Stefan Boleyn. GRUB 2 has
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replaced what was formerly known as GRUB (i.e. version
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0.9x), which has, in turn, become GRUB Legacy.
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Amongst others, GRUB2 offers EFI support, which GRUB Legacy
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doesn't provide.
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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 disk.img
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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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./output/host/usr/sbin/grub-bios-setup \
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-b ./output/host/usr/lib/grub/i386-pc/boot.img \
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-c ./output/images/grub.img -d . /dev/loop0
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6. Your disk.img is ready!
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To test your BIOS image in Qemu:
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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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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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http://www.gnu.org/software/grub/
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if BR2_TARGET_GRUB2
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choice
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prompt "Platform"
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config BR2_TARGET_GRUB2_I386_PC
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bool "i386-pc"
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help
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Select this option if the platform you're targetting is a
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x86 or x86-64 legacy BIOS based platform.
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config BR2_TARGET_GRUB2_I386_EFI
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bool "i386-efi"
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help
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Select this option if the platform you're targetting has a
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32 bits EFI BIOS. Note that some x86-64 platforms use a 32
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bits EFI BIOS, and this option should be used in this case.
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config BR2_TARGET_GRUB2_X86_64_EFI
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bool "x86-64-efi"
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help
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Select this option if the platform you're targetting has a
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64 bits EFI BIOS.
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endchoice
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config BR2_TARGET_GRUB2_BUILTIN_MODULES
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string "builtin modules"
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default "boot linux ext2 fat part_msdos part_gpt normal biosdisk" if BR2_TARGET_GRUB2_I386_PC
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default "boot linux ext2 fat part_msdos part_gpt normal efi_gop" \
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if BR2_TARGET_GRUB2_I386_EFI || BR2_TARGET_GRUB2_X86_64_EFI
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endif # BR2_TARGET_GRUB2
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