I tried to boot GNU/Hurd on a libreboot machine, just because I wanted
to know whether it works. GNU Mach uses drivers from Linux 2.0, there is
no sound support, no SATA support and the graphical display must be
legacy VGA in textmode.
However It might be possible to run the GNU/Hurd using Xen instead of
KVM on a Libreboot system, with GNU/Linux as the Dom0.
https://libreboot.org/faq/#gnuhurd
https://archive.org/details/HurdGrubLibreboot
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Sent from my Libreboot X200