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NixOS RISC-V

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NixOS on RISC-V https://wiki.nixos.org/wiki/RISC-V https://pad.lassul.us/NixOS-riscv64-linux https://github.com/orgs/NixOS/teams/risc-v70 Servers

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9 Mar 2026
@rosscomputerguy:matrix.orgTristan RossIdk how the upstreaming will be done but I just know that the upstreaming is pre-silicon04:57:09
@dramforever:matrix.orgdramforeveri guess also inochi for the ethernet thing04:57:15
@rosscomputerguy:matrix.orgTristan RossYuning is also working on a RISC-V GPU that uses llvmpipe04:57:24
@dramforever:matrix.orgdramforeverhow pre is pre-silicon04:57:30
@rosscomputerguy:matrix.orgTristan RossIdk04:57:36
@rosscomputerguy:matrix.orgTristan RossAt least before people can get their hands on it afaik04:57:54
@rosscomputerguy:matrix.orgTristan RossI can definitely ask though04:59:58
@dramforever:matrix.orgdramforeveri'm not hopeful05:00:11
@dramforever:matrix.orgdramforeverre: the llvmpipe gpu thing05:00:25
@dramforever:matrix.orgdramforeverthe eic7702x laptop was advertised to have 512 "byte" [sic] rvv supposedly using the dsp cores or something, and that never delivered because there was no way it's gonna work05:01:33
@dramforever:matrix.orgdramforevertbh i don't like how Yuning Liang is apparently becoming the face in the riscv community for other people's contributions05:06:31
@dramforever:matrix.orgdramforeverand/or undeliverable promises05:08:14
11 Mar 2026
@jammie:matrix.orgJamieMageeI'm not sure if there are long-term plans for RISC-V builders on hydra, but I found some notes from a Fedora maintainer working on their RISC-V port: https://marcin.juszkiewicz.com.pl/2026/03/10/risc-v-is-sloooow/ 00:24:22
@hexa:lossy.networkhexaonce beefy rv23a hit00:24:48
@hexa:lossy.networkhexawe have an offer for acces to Spacemit K3 hardware too00:26:24
@hexa:lossy.networkhexa* we have an offer for access to Spacemit K3 hardware too00:26:28
@hexa:lossy.networkhexaI have just doubts its worth it00:26:32
@dramforever:matrix.orgdramforeverhydra.nixos.org no, unofficial native riscv hydra running less frequent evals is starting to become viable00:30:01
@dramforever:matrix.orgdramforeveralso beefy is good for perf, rva23 ... it's limited00:30:34
@dramforever:matrix.orgdramforevernotthe most representative but on reddit on coremark they got -30% perf improvement adding vectors on k3. yes that's negative thirty percent, a downgrade00:31:57
@jammie:matrix.orgJamieMageeThat sounds somewhat promising.00:34:45
@jammie:matrix.orgJamieMageeI tried running hydra using QEMU for RISC-V support, and ran headfirst into: https://github.com/NixOS/nixpkgs/issues/460825#issuecomment-3994959331 TL;DR RISC-V bootstrap binutils is predates support for zca, while GCC 15 now implies support for zca :/00:39:27
@dramforever:matrix.orgdramforeverthat's an unrelated failure00:45:37
@dramforever:matrix.orgdramforeverif convenient can you open a new issue for that? thanks00:46:01
@jammie:matrix.orgJamieMagee dramforever: I opened https://github.com/NixOS/nixpkgs/issues/498689 01:01:39
@jammie:matrix.orgJamieMageeI was going to wait for the bootstrap overhaul, but who knows how long that will take to land. So this should resolve the issue for now: https://github.com/NixOS/nixpkgs/pull/49870202:13:47
18 Aug 2023
@shados:nixos.devShados joined the room.05:42:58
@misuzu:matrix.orgmisuzu
% cat /proc/mtd                            
dev:    size   erasesize  name
mtd0: 00080000 00001000 "spl"
mtd1: 00010000 00001000 "uboot-env"
mtd2: 00400000 00001000 "uboot"
mtd3: 00a00000 00001000 "reserved-data"

Looks like the visionfive2_fw_payload.img should be flashed to /dev/mtd2 instead of /dev/mtd1

08:29:39
20 Aug 2023
@erremilia:matrix.orgerremilia joined the room.17:53:34
@claesatwork:matrix.orgClaes joined the room.19:27:07

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