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https://github.com/Metabolix/HackBGRT.git
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52 lines
2.5 KiB
Markdown
52 lines
2.5 KiB
Markdown
# HackBGRT
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HackBGRT is intended as a boot logo changer for UEFI-based Windows systems.
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## Summary
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When booting on a UEFI-based computer, Windows may show a vendor-defined logo which is stored on the UEFI firmware in a section called Boot Graphics Resource Table (BGRT). It's usually very difficult to change the image permamently, but a custom UEFI application may be used to overwrite it during the boot. HackBGRT does exactly that.
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## Usage
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**Important:** If you mess up the installation, your system may become unbootable! Create a rescue disk before use. This software comes with no warranty. Use at your own risk.
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* Make sure that your computer is booting with UEFI.
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* Make sure that Secure Boot is disabled, or learn to sign EFI applications.
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* Simple Windows installation:
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* Get the latest release.
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* Start `setup.exe` and select `I` (install).
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* The installer will launch Notepad for modifying the configuration.
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* If you need only one custom image, the defaults are fine.
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* Otherwise, check out the examples in the configuration file.
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* The installer will launch Paint for creating the image(s).
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* You can create multiple images by using Save As.
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* Be sure to always use the 24-bit BMP/DIB format.
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* If Windows later restores the original boot loader, simply reinstall.
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* If you wish to change the image or other configuration, simply reinstall.
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* Installation for Windows with another boot loader (e.g. GRUB):
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* Extract the latest release to `[EFI System Partition]\EFI\HackBGRT\`.
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* Set `boot=\EFI\Microsoft\Boot\bootmgfw.efi` in `config.txt`.
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* Point your boot loader to `\EFI\HackBGRT\bootx64.efi`.
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* Installation for all operating systems:
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* Extract the latest release to `[EFI System Partition]\EFI\HackBGRT\`.
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* Set `boot=` to your preferred boot loader in `config.txt`.
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* Set `\EFI\HackBGRT\bootx64.efi` as your default boot loader with `efibootmgr` or some other EFI boot manager tool.
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## Configuration
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The configuration options are described in `config.txt`, which should be stored in `[EFI System Partition]\EFI\HackBGRT\config.txt`.
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## Images
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The image path can be changed in the configuration file. The default path is `[EFI System Partition]\EFI\HackBGRT\splash.bmp`.
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The image must be a 24-bit BMP file with a 54-byte header. That's a TrueColor BMP3 in Imagemagick, or 24-bit BMP/DIB in Microsoft Paint.
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Multiple images may be specified, in which case one is picked at random.
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## Building
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* Compiler: GCC targeting w64-mingw32
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* Compiler flags: see Makefile
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* Libraries: gnu-efi
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