2021-05-18 14:21:48 +02:00
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---
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title: GRUB payload
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2023-12-06 20:41:16 +01:00
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x-unreviewed: true
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2021-05-18 14:21:48 +02:00
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...
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TODO: this guide should be reviewed and updated. Some info might be out of
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date.
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[GNU GRUB](https://www.gnu.org/software/grub/) already has excellent
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documentation, but there are aspects of Libreboot that deserve special
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treatment. Libreboot provides the option to boot GNU GRUB directly, running on
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bare metal (instead of using BIOS or UEFI services).
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[The GNU+Linux section](../gnulinux/) also has Libreboot-specific guides for
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dealing with GNU+Linux distributions when using GNU GRUB directly, in this
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setup. [A similar section exists for BSD operating systems](../bsd/)
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GRUB keyboard layouts
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=====================
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It is possible to use *any* keymap in GNU GRUB.
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Custom keyboard layout
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----------------------
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Keymaps are stored in `resources/grub/keymap/`
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You can use the `ckbcomp` program to generate a keymap, based on Xorg keymap
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files:
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ckbcomp fr > frazerty
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When you build GRUB from source, you can use the `grub-mklayout` program to
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create a special keymap file for GRUB. [Learn how to build GRUB](../build/)
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When you've built GRUB, using `lbmk` (libreboot build system), take your kepmap
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file (generated by ckbcomp) and run it through `grub-mklayout` like so:
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cat frazerty | ./grub/grub-mklayout -o frazerty.gkb
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Place the newly created `.gkb` file under `resources/grub/keymap` in lbmk. When
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you build Libreboot, a ROM image with GRUB payload and your newly created
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keymap will be available under the `bin/` directory.
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[Learn how to build Libreboot ROM images](../build/)
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Many keymaps exist in the Libreboot build system, but sometimes you must
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manually tweak the file created by `ckbcomp`, adjusting the scan codes in that
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file, before converting to a GRUB keymap file. Therefore, it would be unwise to
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automatically add all keymaps in GRUB.
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If you've added a keymap to lbmk, and it works,
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[please submit a patch!](../../git.md)
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