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bztsrc--bootboot/images
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bzt 792d73704b FAT16 or FAT32 option
2020-03-16 11:39:41 +01:00
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disk-rpi.img.gz Support for RPi4 2020-02-26 12:54:20 +01:00
disk-x86.img.gz FAT16 or FAT32 option 2020-03-16 11:39:41 +01:00
initrd.rom.gz Booting via Grub works again 2020-01-13 22:22:13 +01:00
Makefile FAT16 or FAT32 option 2020-03-16 11:39:41 +01:00
mkimg.c FAT16 or FAT32 option 2020-03-16 11:39:41 +01:00
OLVASSEL.md FAT16 or FAT32 option 2020-03-16 11:39:41 +01:00
README.md FAT16 or FAT32 option 2020-03-16 11:39:41 +01:00

README.md

BOOTBOOT Example Bootable Disk Images

See BOOTBOOT Protocol for common details.

  • disk-rpi.img.gz: an example image for AArch64 and RaspberryPi 3 and 4
  • disk-x86.img.gz: an example image for x86_64 (CDROM, BIOS, UEFI)
  • initrd.rom.gz: an example initrd ROM image (for embedded BIOS systems)
  • mkimg.c: is a very simple bootable disk image creator tool

Before you can use the images, uncompress them with gzip -d.

Compilation

Look at the beginning of the Makefile, you'll find configurable variables there.

  • DISKSIZE: the overall disk image size to be generated in Mbytes
  • BOOTSIZE: the boot partition size in Kbytes (not megabytes)
  • BOOTTYPE: the boot partition's FAT type, 16 for FAT16 and 32 for FAT32 (12 not supported any more)
  • PLATFORM: either "x86" or "rpi", this selects which disk image to create

If you want to use FAT32 (BOOTTYPE=32), then the partition's size must be at least 33 megabytes.

Executing make all will create the following files:

  • initrd.bin: a gzipped hpodc cpio initrd image, containing only the kernel executable for now
  • bootpart.bin: the boot partition (ESP with FAT16 or FAT32), containing the initrd and the required files for booting
  • disk-(PLATFORM).img: a hybrid disk image with GPT partitions

The disk-x86.img is a special hybrid image, which can be renamed to disk-x86.iso and then burnt to a CDROM; it can also be booted from an USB stick in a BIOS machine as well as an UEFI machine.

The disk-rpi.img can be written to an SDCard (Class 10) and booted on a Raspberry Pi 3 and 4.

The disk images contain only one boot partition. Feel free to use fdisk and add more partitions to your needs.

Testing

To test BOOTBOOT in qemu, you can use:

make rom

Will boot the example kernel from ROM (via BIOS Boot Spec, diskless test).

make bios

Will boot the example kernel from disk (using BIOS).

make cdrom

Will boot the example kernel in El Torito "no emulation" mode (BIOS).

make efi

Will boot the example kernel from disk using UEFI. You must provide your own TianoCore image, and set the path for it in the Makefile.

make eficdrom

Will boot the example kernel under UEFI from CDROM.

make grubcdrom

Will create a cdrom image using grub-mkrescue and boot BOOTBOOT using Multiboot.

make linux

Will boot the example kernel by booting BOOTBOOT via the Linux/x86 Boot Protocol.

make sdcard

Will boot the example kernel from SDCard emulating "raspi3" machine under qemu (requires qemu-system-aarch64).