I do, and I recoil 
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I was trying to picture an L5 with the old 25 pins parallel printer connector. 
To be serious: there are USB to serial adapters, I used to use them when configuring switches at the console port. They where a pain in the a## . When they worked all was fine, but to get them going was always a nightmare.
You not say 
On the subject of connecting All The Things™ to a phone:
On this picture, it’s the phone that’s attached to the thing…
So downloaded kernel source linux-6.2-rc2, copied contents of Librem 5 /proc/config.gz to .config, edited to enable KEXEC and compiled the kernel on an rpi4 just to be sure arch-wise.
Much to my surprise the resulting kernel does not boot. The led even switches off.
Do the kernels need to be signed for some kind of secure boot or something?
I would say “no”, both because that totally gets away from Purism’s approach and because I was able to build Jumpdrive from sources and boot it on my Librem 5 (which wouldn’t work if anyone other than I was needed to sign the resulting kernel).
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To test the kernel, I recommend to start with uuu.
This script will boot a given kernel: https://source.puri.sm/Librem5/librem5-devkit-tools/-/blob/pureos/byzantium/uuu_scripts/boot_librem5.lst
I appreciate you take the time to reply, but from my original message it should be quite obvious that I am using uuu.
In the mean time I’ve discovered that the Linux kernel source from https://source.puri.sm/Librem5/linux does produce a booting kernel so some essential code seems not available in upstream.
I’m trying to build a module-less variant to boot NixOS with.
With “build Jumpdrive”, you also mean the kernel? If yes, I assume you we not using upstream kernel as your source?
Oh, sorry. I only looked at the most recent message. Anyway, I think you know as much as I do now.
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Yes
Correct. git cloned from something on source.puri.sm
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I’ve managed to get NixOS running on the Librem 5 with a kernel build from https://source.puri.sm/Librem5/linux.git
Biggest issue atm is that I do not have sound in calls due to callaudiod segfaulting.
One of the minor issues that I have to run mkimage by hand to update /boot/boot.scr on configuration changes, to to boot into a new NixOS environment. It seems Purism u-boot does not support u-boot’s Generic Distro Configuration Concept which supports /boot/extlinux/ extlinux.conf: https://u-boot.readthedocs.io/en/latest/develop/distro.html
The part in /etc/nixos/configuration.nix that builds the Purism kernel is:
boot = {
initrd = {
kernelModules = [ "bq25891_charger" "dwc3" "imx_dcss" "imx_sdma" "mtdblock" "ofpart" "phy_fsl_imx8mq_usb" "snvs_pwrkey" "spi_nor" "tps6598x" "xhci_hcd" "usbcore" "usb_storage" "uas" "xhci_plat_hcd" ];
};
kernelParams = [ "console=tty0" "earlyprintk=vga" "ignore_loglevel" "rootwait" ];
loader = {
generic-extlinux-compatible.enable = true;
grub.enable = false;
};
kernelPackages = let
linux_librem5_pkg = { fetchgit, buildLinux, ... } @ args:
buildLinux (args // rec {
defconfig = "librem5_defconfig";
version = "6.1.6-librem5";
modDirVersion = version;
src = fetchgit {
url = "https://source.puri.sm/Librem5/linux.git";
hash = "sha256-EE6WHqgBmoRuZnbCPO3NrydOHPxG8G7lZXxDNm/2Kq4=";
};
kernelPatches = [];
} // (args.argsOverride or {}));
linux_librem5 = pkgs.callPackage linux_librem5_pkg{};
in
pkgs.recurseIntoAttrs (pkgs.linuxPackagesFor linux_librem5);
};
3 Likes
Perhaps this merge request may be of interest to you:
If it is we can share here how to install it.
2 Likes
Also do you have the mandatory screenshot of it running NixOS 
That seems exactly what is needed! Please share 
Will create 
Well…
On a debian based system…
You would download the .deb package from here;
install it with:
sudo apt install ./u-boot-librem5_2022.10-librem5.1_arm64.deb
then run sudo u-boot-install-librem5 /dev/mmcblk0
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$ curl -LOC - https://source.puri.sm/a-wai/uboot-imx/-/jobs/405334/artifacts/raw/debian/output/u-boot-librem5_2022.10-librem5.1_arm64.deb
$ ar -x u-boot-librem5_2022.10-librem5.1_arm64.deb
$ tar xf data.tar.xz
$ cat usr/bin/u-boot-install-librem5
$ sudo dd if=/dev/zero of=/dev/mmcblk0 bs=1024 count=1055 seek=2
$ sudo dd if=usr/lib/u-boot/librem5/u-boot.imx conv=notrunc of=/dev/mmcblk0 bs=1024 seek=33
I’ll need to verify and execute this.
edit: this works, thanks! 
3 Likes
I’ve revived my Librem 5 after it has been laying on my desk for months - plugged in once a week to prevent the battery from draining to zero - after a failed u-boot update, and wanted to finally follow up to your request:
[ookhoi@librem5:~]$ nix run -- nixpkgs#screenfetch
::::. '::::: ::::' ookhoi@librem5
'::::: ':::::. ::::' OS: NixOS 24.11.20241001.e277415 (Vicuna)
::::: '::::.::::: Kernel: aarch64 Linux 6.6.52-librem5
.......:::::..... :::::::: Uptime: 1h 25m
::::::::::::::::::. :::::: ::::. Packages: 1306
::::::::::::::::::::: :::::. .::::' Shell: bash 5.2.32
..... ::::' :::::' Disk: 11G / 30G (38%)
::::: '::' :::::' CPU: Unknown @ 4x 1.5GHz
........::::: ' :::::::::::. GPU:
::::::::::::: ::::::::::::: RAM: 682MiB / 2888MiB
::::::::::: .. :::::
.::::: .::: :::::
.::::: ::::: ''''' .....
::::: ':::::. ......:::::::::::::'
::: ::::::. ':::::::::::::::::'
.:::::::: '::::::::::
.::::''::::. '::::.
.::::' ::::. '::::.
.:::: :::: '::::.
Not much installed yet.
4 Likes