gnuboot/website/pages/docs/grub/index.md

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---
title: GRUB payload
...
TODO: this guide should be reviewed and updated. Some info might be out of
date.
[GNU GRUB](https://www.gnu.org/software/grub/) already has excellent
documentation, but there are aspects of GNU Boot that deserve special
treatment. GNU Boot provides the option to boot GNU GRUB directly, running on
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bare metal (instead of using BIOS or UEFI services).
[The GNU+Linux section](../gnulinux/) also has GNU Boot specific guides for
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dealing with GNU+Linux distributions when using GNU GRUB directly, in this
setup. [A similar section exists for BSD operating systems](../bsd/)
GRUB keyboard layouts
=====================
It is possible to use *any* keymap in GNU GRUB.
Custom keyboard layout
----------------------
Keymaps are stored in `resources/grub/keymap/`
You can use the `ckbcomp` program to generate a keymap, based on Xorg keymap
files:
ckbcomp fr > frazerty
When you build GRUB from source, you can use the `grub-mklayout` program to
create a special keymap file for GRUB. [Learn how to build GRUB](../build/)
When you've built GRUB, using GNU Boot, take your kepmap file (generated by
ckbcomp) and run it through `grub-mklayout` like so:
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cat frazerty | ./grub/grub-mklayout -o frazerty.gkb
Place the newly created `.gkb` file under `resources/grub/keymap` in lbmk. When
you build GNU Boot, an image with GRUB payload and your newly created
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keymap will be available under the `bin/` directory.
[Learn how to build GNU Boot images](../build/)
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Many keymaps exist in the GNU Boot build system, but sometimes you must
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manually tweak the file created by `ckbcomp`, adjusting the scan codes in that
file, before converting to a GRUB keymap file. Therefore, it would be unwise to
automatically add all keymaps in GRUB.
If you've added a keymap to lbmk, and it works,
[please submit a patch!](../../contribute.md)