I've installed the Guix system on my cubietruck yesterday, but had some
difficulties. At first, the root partition was not available at boot, so
I got a repl with a message saying that /dev/mmcblk0p1 was not
available. I added the following to my guix config file:
(initrd-modules (cons "sunxi_mmc" %base-initrd-modules))
although the guix system command worked, the produced system still
couldn't boot, but this time the message was that guix was unable to
find sunxi_mmc.ko. Using the repl I could confirm that this module was
indeed here, but under the name sunxi-mmc.ko. Using load-linux-module*,
I was able to confirm that loading it made the filesystem available in
/dev. In the end this line:
(initrd-modules (cons "sunxi-mmc" %base-initrd-modules))
was the right line to add, and I could properly boot my cubietruck!
The bug here is that guix should either be smarter and load sunxi-mmc.ko
when it can't find sunxi_mmc.ko, or not allow me to build a system when
I specify sunxi_mmc since it doesn't exist at boot time.