Also, the Linux kernel console is something independent from grub. To test that, try adding "console=ttyS0,115200" to the operating-system's kernel-arguments.
Currently, Guix automatically set up a getty if it detects the "console=ttyS0" argument in /proc/cmdline . That is supposed to ensure some reasonable console continuity, so as soon as the Linux kernel has a console, the userspace is also supposed to use it automatically. It might make sense to make our grub automatically add "console=ttyS0,115200" to the Linux command line that it already emits.
pgpoMJbiP_nLV.pgp
Description: OpenPGP digital signature
