RISC-V (riscv64-linux) substitutes are coming

[Christopher Baines]

Hey!

Almost a year ago now [1] I mentioned that I had received a HiFive
Unmatched board, but I hadn't got it doing anything yet.

1: https://lists.gnu.org/archive/html/guix-devel/2021-06/msg00104.html

In the last few days I've made some time to take a look at it again and
try to get it connected up to the bordeaux build farm.

This has been somewhat successful, you should be able to see the machine
(named rochor) on the prototype activity viewer [2].

2: https://bordeaux.guix.gnu.org/activity

Unfortunately it seems a bit stuck trying to upload the build results
back to the coordinator due to the suspendable ports issues in
guile-gnutls, but that should be fixed in the latest release so
hopefully I'll be able to deploy that fix soon.

It's also just currently a bare board hooked up to a spare power supply
I have. I'll try and cost up a dedicated power supply plus case for it,
and if anyone has suggestions for minimal mini-itx compatible cases,
please let me know!

This is a start, but more hardware will be needed to keep up with the
master branch, plus testing patches and other branches, so if you have
hardware to hand, or know of hardware available for purchase that might
be suitable, that would be really useful to know about.

Thanks,

Chris

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