NixOS on ARM/Clockworkpi A06 uConsole

Status

Panel/Display works. Broadcom wifi works. System boots. All other features untested.

Kernel

The device tree patches to make the panel/display work are currently only available as kernel patches. The official patches only support kernel 5.x, however there is a community patchset for kernel 6.5 available at [[1]]

These patches can be applied using the following nix snippet: ```

 boot.kernelPackages = pkgs.linuxPackages_6_5;
 boot.kernelPatches = [
   {
     name = "suspend";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/00-rockchip-suspend.patch };
   }  
   {
     name = "a06";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/01-clockworkpi-dts-a06.patch; };
   }  
   {
     name = "backlight";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/02-backlight-ocp8178.patch; };
   }  
   {
     name = "cwd686";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/02-panel-cwd686-driver.patch; };
   }  
   {
     name = "cwu50";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/02-panel-cwu50-driver.patch; };
   }  
   {
     name = "uconsole";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/03-clockworkpi-dts-uconsole.patch; };
   }  
   { 
     name = "power";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/04-mfd-axp20x-add-clockworkpi-a06-power-support.patch; };
   }  
   {
     name = "extcart";
     patch = fetchurl { url = https://raw.githubusercontent.com/Autianic/clockworkpi-linux-kernel/master/linux-clockworkpi-a06/06-clockworkpi-a06-extcart.patch; };
   }  
 ];

```

Bootloader

At present I am not sure where the bootloader images used by the official/vendor supplied distro can be obtained. The easiest way to make any generated image bootable is to copy them from the official image available here: [[2]]

``` $ sfdisk --dump uConsole_A06_v1.1e.img <...> uConsoleA06_v1.1e.img1 : start = 32768, size = 14942208, type=83

$ sfdisk --dump your_nixos_image.img <...> your_nixos_image.img1 : start = 16384, size = 61440, type = b your_nixos_image.img2 : start = 77824, size = 15322384, type = 83, bootable

$ dd if=uConsole_A06_v1.1e.img of=nixos_a06.img count=32768 $ dd if=your_nixos_image.img skip=32768 of=nixos_a06.img seek=77824 ```

The partition table for the resulting image will then be wrong, but we can fix that with fdisk by deleting our partition, and then recreating it. ``` fdisk ./nixos_a06.img d n p 1 32768 <Default should now be to end of file> Do you want to remove the signature? No w

$ sfdisk --dump nixos_a06.img <...> nixos_a06.img1 start = 32768, size = 15322384, type=83 ````

Your image should now be bootable.