Yes, there are many more options in Libreboot's GRUB menu. Every entry is just a bunch of commands that you can view and edit by pressing `e`. You can also open the GRUB terminal directly by pressing `c` and then type the commands necessary to boot. Even of the existing Libreboot menu entries there is an alternative to Parse ISOLINUX, namely "Search for GRUB configuration outside of CBFS". As I explained above, this is the method of booting GuixSD.

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