NixOS on ARM/ODROID-C2: Difference between revisions

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-I used minicom to access the serial:
+{{ARM/breadcrumb}}
+<div class="infobox">
+{|class="table"
+!colspan="2" class="title"|Hardkernel ODROID-C2
+|-
+|colspan="2"|[[File:ODROID-C2.jpg|frameless|256px|An ODROID-C2.]]
+|-
+!Manufacturer
+|Hardkernel
+|-
+!Architecture
+|AArch64
+|-
+!Bootloader
+| Upstream U-Boot
+|-
+!Boot options
+|SD, eMMC
+|}
+</div>
+{{outdated|The information is likely outdated, but it is likely the ODROID-C2 works well.}}
+== Status ==
+Mainline kernel from NixOS has been reported as working<ref>https://logs.nix.samueldr.com/nixos-aarch64/2018-01-25#863144;</ref>. A non-specified build from mainline u-boot also has been reported to work.
+== Board-specific installation notes ==
+Note this assumes u-boot is in partition 1 of your board's connected eMMC. If you haven't done that yet, you can build it with nix and then write it this fusing script (using an emmc/usb adapter) [http://mirror.archlinuxarm.org/aarch64/alarm/uboot-odroid-c2-mainline-2019.07-1-aarch64.pkg.tar.xz download and extract] (replace /dev/sdX with the device for the eMMC):
+<syntaxhighlight lang=bash>
+nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.ubootOdroidC2
+cd result
+bash /path/to/extracted/boot/sd_fusing.sh /dev/sdX
+</syntaxhighlight>
+# Download the sd-image from Hydra at https://hydra.nixos.org/job/nixos/release-22.05-aarch64/nixos.sd_image.aarch64-linux/latest
+# Copy it to the SD card
+# Mount first partition to /mnt with <code>sudo mount /dev/mmcblk0p1 /mnt</code>
+# Edit /mnt/extlinux/extlinux.conf and delete all the console=tty.... arguments in the APPEND line
+# Add <code>console=ttyAML0,115200n8</code> to the end of the APPEND line
+it will look something like this:
+<syntaxhighlight lang=bash>
+$ cat  /mnt/extlinux/extlinux.conf
+# Generated file, all changes will be lost on nixos-rebuild!
+# Change this to e.g. nixos-42 to temporarily boot to an older configuration.
+DEFAULT nixos-default
+MENU TITLE ------------------------------------------------------------
+TIMEOUT 30
+LABEL nixos-default
+  MENU LABEL NixOS - Default
+  LINUX ../nixos/gz1chw67hj8fj2b3xdrkv1nxrv8jvdzv-linux-4.19.13-Image
+  INITRD ../nixos/4gifkl2yv2g58nxmf6z68y42s70xrsg0-initrd-initrd
+  FDTDIR ../nixos/gz1chw67hj8fj2b3xdrkv1nxrv8jvdzv-linux-4.19.13-dtbs
+  APPEND systemConfig=/nix/store/...-nixos-system-nixos-xxx.xxx.xxx.xxx init=/nix/store/...-nixos-system-nixos-xx.xx.xxxx.xxx init loglevel=7 cma=32M console=ttyAML0,115200n8
+</syntaxhighlight>
+and then boot the sdcard.
+Once booted, partition your on-board emmc like:
+<syntaxhighlight>
+Device         Boot    Start      End  Sectors  Size Id Type
+/dev/mmcblk0p1          2048   264191   262144  128M  c W95 FAT32 (LBA)
+/dev/mmcblk0p2 *      264192 50595839 50331648   24G 83 Linux
+/dev/mmcblk0p3      50595840 61071359 10475520    5G 83 Linux
+</syntaxhighlight>
+note **p2** is bootable.
+<syntaxhighlight lang=console>
+$ mkfs.ext4 /dev/mmcblk0p2
+$ mkswap /dev/mmcblk0p3
+$ swapon /dev/mmcblk0p3
+$ mount /dev/mmcblk0p2 /mnt
+$ nixos-generate-config /mnt
+$ nixos-install
+$ reboot
+</syntaxhighlight>
+== Serial console ==
+I used minicom to access the serial console:
 <syntaxhighlight>
@@ Line 9: / Line 96: @@
 </syntaxhighlight>
-then run `sudo minicom` to access the serial console.
+then run <code>sudo minicom</code> to access the console.
+==Xorg==
+Nixos 20.03 should install all modules needed for this to work but at least two changes should be made to the xorg configuration:
+<pre>
+services.xserver.videoDrivers = [ "modesetting"  ];
+  services.xserver.extraConfig = ''
+    Section "OutputClass"
+        Identifier "Meson"
+        MatchDriver "meson"
+        Driver "modesetting"
+        Option "PrimaryGPU" "true"
+    EndSection
+  '';
+</pre>
+The HW cursor support was very laggy when tried on 20.03 so enabling the software cursor may be desired:
+<pre>
+services.xserver.deviceSection = "Option \"SWcursor\" \"on\"";
+</pre>
+== Resources ==
+* [https://www.hardkernel.com/shop/odroid-c2/ Official product page]
+* NixOS Image Build for [https://github.com/georgewhewell/nixos-nanopim3/blob/master/hardware/boards/odroid-c2.nix Odroid-C2 by George Whewell]