In reply to @alex:tunstall.xyz
I tried updating my VF2 to latest nixos-unstable (as of ~1 week ago) and now it won't boot...
Unhandled exception: Instruction access fault
EPC: ffffffa700140304 RA: 00000000cb55d034 TVAL: ffffffa700140304
EPC: ffffffa67359d304 RA: 000000003e9ba034 reloc adjusted
(Then a dump of the registers.)
It seems like there's something wrong with the bootloader on the EFI partition.
Switching back to the bootloader of the previous version worked.
Change that broke the system: https://github.com/AlexandreTunstall/nixos-riscv/commit/b50ef62175853684441a9e312aa12218f5be79d3
Good Nixpkgs revision: 2726f127c15a4cc9810843b96cad73c7eb39e443
Bad Nixpkgs revision: 4cba8b53da471aea2ab2b0c1f30a81e7c451f4b6
Has anyone else booted such a recent Nixpkgs version?
I just ran into this problem after upgrading kernel and u-boot... I'm already using generic-extlinux-compatible though :-/ 
fgaz
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