| 19 Mar 2025 |
|  Sergei Zimmerman (xokdvium) changed their display name from xokdvium to Sergei Zimmerman (xokdvium). | 21:12:14 |
| 24 Mar 2025 |
 Kamilla 'ova | bugs in QEMU's RISC-V implementation
just use https://github.com/LekKit/RVVM :)
it's jit is also faster than qemu tcg | 11:50:19 |
| Kamilla 'ova | bugs in QEMU's RISC-V implementation
just use https://github.com/LekKit/RVVM :)
its jit is also faster than qemu tcg | 11:51:10 |
 Jake Hillion | How do you connect up RVVM with the build infra? I have the binfmt-misc stuff setup for doing builds on my EPYC machine (not much luck yet lol, needs some more work to get my VisionFive2 up and running), is RVVM the same deal or more of a standard VM setup? | 11:52:35 |
| Kamilla 'ova | RVVM is mainly a full system emulator like virtualbox, but it also has (too much WIP, feel free to contribute!) rvvm-user
ofc it uses softmmu (which is slow), but there is some work on using hardware mmu (without kvm) via low-level mmu hacks, which are currently (experimentally) implemented for risc-v, but could also be implemented for x86 and arm, if you know (or know someone who knows) a lot about x86 ring0 assembly and mmu setup - feel free to help :) https://github.com/LekKit/RVVM?tab=readme-ov-file#%EF%B8%8F-support-the-project
https://github.com/LekKit/shadow_pgt | 12:10:37 |
| Jake Hillion | Nice, thanks for the info! I'll have a go at setting up a VM on my EPYC machine tonight. Still getting started with RISC-V, and I want to initially get a good idea of what the bootstrapping experience is like when you combine emulation/small physical hardware like the VisionFive2. Already started having fun with packages that I previously couldn't build for armv7l either not building under QEMU emulation (mainly checks). I don't think I'm the ASM guy unfortunately, i'm a systems/bpf dev but nothing that low level. | 12:49:04 |
| Jake Hillion | Do we have any experience so far with how well Nixpkgs takes changes like this for RISC-V?: https://github.com/NixOS/nixpkgs/blob/4d82b26c6a5da66d0c78407bff11562aa2118e89/pkgs/by-name/bo/boehmgc/package.nix#L64-L70 | 12:55:53 |
| Kamilla 'ova | combine emulation/small physical hardware like the VisionFive2
what? canadian cross? | 13:06:19 |
| Jake Hillion | Haha, worded that poorly. I mean I have a big x86_64 machine that can do emulation, and a small RISC-V machine that can do native builds. Hoping that between the two I can bootstrap properly. | 13:08:12 |
 Steven Keuchel | you can cross-compile an sdcard first, and then do a native recompilation. I think it takes ~1w to natively compile a basic system on the VF2 only, 3-4days on the Premier / Megrez boards, and 1-2 days on the Pioneer. | 13:12:37 |
| Steven Keuchel | qemu user mode emulation works for many packages and is ok performance wise. system emulation is comparable to the JH7110, so keep your expectations in check. | 13:14:51 |
| Steven Keuchel | I had 8 VMs with 8 cores each running on a 64core threadripper at some point and it was a miserable experience :P | 13:15:37 |
| Jake Hillion | Awesome, thank you! And hopefully last question for now, cross compiling the SD image comes from the instructions on https://wiki.nixos.org/wiki/NixOS_on_RISCV/VisionFive_2? I'm currently trying to bootstrap from their Debian but would be easier in NixOS. | 13:24:48 |
| Steven Keuchel | did not know that wiki page existed. I started from https://github.com/NixOS/nixos-hardware/tree/master/starfive/visionfive/v2 but that seems to be the same thing | 13:26:44 |
 Nick Cao | Shameless plug: I have vf2 sd image cached at https://hydra.nichi.co/job/nixos/riscv/visionfive2 | 13:27:11 |
| Nick Cao | (I'm no longer sponsored to do this work so consider it a best effort thing) | 13:27:30 |
| Nick Cao | src: https://github.com/NickCao/nixos-riscv | 13:28:10 |
| 25 Mar 2025 |
|  Find me at aleksana:qaq.li changed their display name from aleksana (force me to bed after 18:00 UTC) to aleksana 🏳️⚧️ (force me to bed after 18:00 UTC). | 17:00:21 |
| 26 Mar 2025 |
|  Dagn Hive changed their profile picture. | 03:50:17 |
|  @burntk:matrix.org left the room. | 07:00:42 |
 misuzu | 
Download 1000002138.jpg | 18:00:50 |
| misuzu | In reply to @misuzu:matrix.org
https://liliputing.com/orange-pi-rv2-is-a-single-board-pc-with-an-8-core-risc-v-processor/ Ordered one | 18:00:59 |
| Dagn Hive changed their profile picture. | 19:28:35 |
| 27 Mar 2025 |
 implr | Anyone tried to build something without crosscompiling (so system=riscv64-linux; no crossSystem), via qemu-user or natively recently? | 20:40:33 |
| implr | On current unstable, bison is failing doCheck for me, but it's in one of the bootstrap stages, so it's a huge pain in the ass to override | 20:40:58 |
| implr | * On current unstable, bison is failing doInstallCheck for me, but it's in one of the bootstrap stages, so it's a huge pain in the ass to override | 20:42:42 |
 Alex | NixOS compiled fine for commit 3a228057.
(See https://github.com/AlexandreTunstall/nixos-riscv/blob/6fc5181216631eaeec703fb09028b127c01d27a1/flake.lock#L9) | 20:42:47 |
| Alex | So the regression has happened in the past month or so. | 20:43:11 |
| implr | Let me double check if that commit works for me, maybe I did something dumb | 20:43:37 |
| implr | hm, it does not, fails the same way | 23:13:52 |
