#nixos-aarch64 on 2020-05-17

2019-09-27 17:31 gchristensen changed the topic of #nixos-aarch64 to: Get access to the NixOS Community aarch64 build box: https://github.com/nix-community/aarch64-build-box ... todo: https://hydra.nixos.org/jobset/nixpkgs/trunk#tabs-jobs build box status: https://status.nixos.org/grafana/d/5LANB9pZk/per-instance-metrics?orgId=1&refresh=30s&var-instance=147.75.77.190

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18:18 <hexa-> is there a way to read out the temperature sensor on the rpi4?

18:20 <clever> root@raspberrypi:~# vcgencmd measure_temp

18:20 <clever> temp=44.0'C

18:20 <clever> hexa-: thats on my rpi4

18:20 <hexa-> hm, with nixos?

18:21 <clever> hexa-: that binary can also be found in nixpkgs

18:21 <clever> > raspberrypi-tools

18:21 <{^_^}> "<derivation /nix/store/jzb30cx1s5dq9xfx5vhb0gbf4dfmjnsc-raspberrypi-tools-2018-10-03.drv>"

18:21 <hexa-> oh, thanks

18:22 <hexa-> works \o/

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18:59 <Thra11> Not really a NixOS issue, but does anyone know why this overlay doesn't apply: https://gist.github.com/Thra11/d1da852be71f5ff1958f61d235c20cbe (gist contains error message, plus fdtdump of dtb and dtbo)

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19:18 <samueldr> not related, but I hate those "error messages" that are not more than a cryptic code

19:18 <samueldr> how much would it cost to print *what* wasn't found?

19:21 <samueldr> at that point in time, maybe it would help to patch fdtoverlay to be overly noisy?

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20:26 <clever> = note: /nix/store/h4bkk5lqfh80xsp64c1wsfag5p5qiigv-x86_64-w64-mingw32-binutils-2.31.1/bin/x86_64-w64-mingw32-ld: cannot find -lpthread

20:26 <clever> oops

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22:20 <lovesegfault> samueldr: When using eval-machine, which attr do I need to build to get an iso I can write to my USB stick and try booting off of

22:20 <samueldr> eval-machine?

22:20 <lovesegfault> samueldr: https://github.com/lovesegfault/nix-config/blob/master/default.nix#L4-L10

22:20 <lovesegfault> this stuff

22:21 <samueldr> oh, if it ends up being `system.build` I can see

22:22 <samueldr> first, you almost definitely want sd_image and not the iso

22:22 <lovesegfault> It does yea, I was going to add a `mkIso = name: arch: (mkNixOS name arch).$something;`

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22:22 <samueldr> when this is part of your config https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/installer/cd-dvd/sd-image-aarch64.nix

22:22 <lovesegfault> Can I dd the sd_image to a usb stick and it works?

22:22 <samueldr> this ends up used https://github.com/NixOS/nixpkgs/blob/6feee80de0920fbff16305f9c3a3f93d4f38e5da/nixos/modules/installer/cd-dvd/sd-image.nix#L132

22:22 <samueldr> lovesegfault: yeah

22:23 <samueldr> sd_image would be more appropriately named "image with partition marked bootable and an extlinux.conf file"

22:23 <samueldr> lovesegfault: are those two links enough for you to understand?

22:23 <lovesegfault> I think so, I'm reading through them

22:23 <lovesegfault> Thanks :)

22:23 <samueldr> great :)

22:23 <lovesegfault> samueldr++

22:24 <{^_^}> samueldr's karma got increased to 229

22:26 <lovesegfault> this board has everything different

22:26 <lovesegfault> ttyTCU0

22:26 <lovesegfault> *is the serial

22:26 <samueldr> oh, another thing that's different in the vendor raspberry pi kernels vs. mainline

22:26 <samueldr> iirc there too the port names change

22:26 <samueldr> mainline has a preferred nomenclature

22:27 <samueldr> and way to provide names

22:27 <lovesegfault> https://gist.github.com/lovesegfault/e5502a5e282404781e9fe5dd81b645b1

22:27 <samueldr> so I wouldn't be surprised that an l4t kernel vs. a mainline with support for that board would differ too

22:27 <lovesegfault> this is what the ubuntu it comes with boots with

22:30 <samueldr> it's possible the generated extlinux.conf will be missing FDT stuff, it may be needed for the board to boot

22:30 <lovesegfault> FDT?

22:31 <clever> flattened device tree

22:31 <clever> the .dtb files

22:31 * lovesegfault takes notes

22:32 <samueldr> lovesegfault: I'm sure I mentioned that yesterday in our quick char

22:32 <samueldr> chat*

22:32 <samueldr> or was it really early this morning?

22:32 <lovesegfault> You had talked about FDT${two more letters}

22:33 <samueldr> FDTDIR

22:33 <lovesegfault> That one

22:33 <samueldr> https://logs.nix.samueldr.com/nixos-chat/2020-05-16#1589601067-1589601264;

22:34 <lovesegfault> Oops :D

22:34 <samueldr> https://github.com/NixOS/nixpkgs/blob/6feee80de0920fbff16305f9c3a3f93d4f38e5da/nixos/modules/system/boot/loader/generic-extlinux-compatible/extlinux-conf-builder.sh#L98-L100

22:34 <lovesegfault> So I need to package the dtbs first?

22:34 <samueldr> this is how FDTDIR is put in the file, you probably want to provide a way to add FDT

22:35 <samueldr> or you could use their blob beforehand to reduce variables

22:35 <samueldr> well, their pre-made .dtb

22:35 <lovesegfault> I _think_ that's all they offer?

22:35 <samueldr> or else you'd have a boatload of variables to check when things fail

22:35 <samueldr> it's likely the .dtb source is in l4t

22:35 <samueldr> like, in the linux kernel from l4t

22:36 * lovesegfault nods

22:37 <samueldr> I wonder if that generator script can be adapted to add arbitrary entries to the extlinux.conf

22:37 <samueldr> I would maybe add a `extlinux.entries.conf` file that could be read from per-generation like those https://github.com/NixOS/nixpkgs/blob/6feee80de0920fbff16305f9c3a3f93d4f38e5da/nixos/modules/system/boot/loader/generic-extlinux-compatible/extlinux-conf-builder.sh#L78

22:38 <samueldr> so you wouldn't need to add FDT support, but only arbitrary lines

22:39 <lovesegfault> 🤔

22:39 * lovesegfault goes eat lunch quickly

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23:08 <lovesegfault> andi-: Ping