What? Too little info.
“no root” = no root filesystem?
What method was used? Custom cartridge? Header/expansion hacking?
What’s the text dump from? Presumably from a serial port (controller port?) rather than actual video output that has been transcribed.
Which CPUs inside the device are being used? By memory the n64 has a complex architecture.
EDIT: Or is this completely emulated?
The author also ported Linux to the N64 (translation). His presentation gives a bit more info.