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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 72 Servers

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22 Dec 2024
@hsngrmpf:matrix.orgDavHau joined the room.06:05:05
23 Dec 2024
@hsngrmpf:matrix.orgDavHauI got a VisionFive2 V1.3B and was not able to get nixos booting so far? I already flashed the latest bootloader via an upstream image. Unfortunately I do not have an hdmi cable or UART adapter (ordered, in transit). When I flash the nixos image linked in the nixos wiki, I do not see the device in my LAN and also the green LED does not flash? Should the green LED supposed to be flashing under nixos, as it does with the official images?08:59:37
@hsngrmpf:matrix.orgDavHau(I'm falshing the nixos to an sd card and have the switches on the board configured correctly. Also the latest official image boots fine from sd card, so I guess everything with my board is OK)09:08:46
@alex:tunstall.xyzAlex
In reply to @hsngrmpf:matrix.org
I got a VisionFive2 V1.3B and was not able to get nixos booting so far? I already flashed the latest bootloader via an upstream image.
Unfortunately I do not have an hdmi cable or UART adapter (ordered, in transit).
When I flash the nixos image linked in the nixos wiki, I do not see the device in my LAN and also the green LED does not flash?
Should the green LED supposed to be flashing under nixos, as it does with the official images?
I don't recall it flashing under most NixOS builds -- only vendor images. 		10:10:28
@alex:tunstall.xyzAlex

You should be able to get it onto the network. If you can't, you could try getting it to log to the disk, but you're practically debugging blind without UART.

You're not booting from NVMe, are you? That doesn't work on some firmware versions (not properly configured to try NVMe).

Another thing to note is the selected boot mode. The vendor image is more tolerant and can probably boot in most modes, whereas some NixOS images need you to boot from flash (no firmware partition).

10:15:43
@hsngrmpf:matrix.orgDavHauCheers! Now it popped up in my network. Not sure what went wrong before. I just flashed the image form the wiki again and it's online.10:19:00
@hsngrmpf:matrix.orgDavHauThough there is no hdmi output on any image I tried so far. Maybe the hdmi on my board is broken10:20:29
@alex:tunstall.xyzAlex
In reply to @hsngrmpf:matrix.org
Though there is no hdmi output on any image I tried so far. Maybe the hdmi on my board is broken

It's very likely that your kernel doesn't have a driver for the HDMI. Check the version and what patches are being applied on top.

See: https://rvspace.org/en/project/JH7110_Upstream_Plan

10:23:55
@hsngrmpf:matrix.orgDavHauAlaright, I was now able to boot my own cross compiled image and login via ssh 🚀10:24:35
@alex:tunstall.xyzAlexThe vendor's graphical image should have working HDMI (with some glitchiness, unless they've fixed it).10:25:00
@xiaoxiangmoe:matrix.org@xiaoxiangmoe:matrix.org left the room.14:09:36
25 Dec 2024
@hsngrmpf:matrix.orgDavHau

Fixed a bunch of cross build issue with python packages and got home-assistant almost running, but there is one I'm having trouble with wrapping my head around. The python bcrypt library just builds its shared object for x86 instead of riscv
Any ideas why?

> nix-build -A pkgsCross.riscv64.python3Packages.bcrypt
/nix/store/xfc8xssvq2vwcn6126ml3m6fkdd1gzw0-python3.12-bcrypt-4.2.0-riscv64-unknown-linux-gnu

> file /nix/store/xfc8xssvq2vwcn6126ml3m6fkdd1gzw0-python3.12-bcrypt-4.2.0-riscv64-unknown-linux-gnu/lib/python3.12/site-packages/bcrypt/_bcrypt.cpython-312-riscv64-linux-gnu.so
/nix/store/xfc8xssvq2vwcn6126ml3m6fkdd1gzw0-python3.12-bcrypt-4.2.0-riscv64-unknown-linux-gnu/lib/python3.12/site-packages/bcrypt/_bcrypt.cpython-312-riscv64-linux-gnu.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped
07:34:49
@hsngrmpf:matrix.orgDavHauThe binary is a result from a rust build. The derivation in nixpks looks fine. Other python packages containing rust cross compile correctly07:36:48
@alex:tunstall.xyzAlex The Python package's install script might not be cross-friendly; you should look at the package's source.
If it's doing the build itself, it probably found the buildPackages compiler instead of the cross compiler. 		07:40:29
@hsngrmpf:matrix.orgDavHauOK, for rust the compiler is target platform specific like with gcc?11:10:44

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