odroidh2p-0: manual installation

nix/os/devices/odroidh2p-0/README.md

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+# Manual installation - unencrypted
+
+## Partitioning
+```
+mkpart bios_grub 1MiB 2MiB
+set 1 bios_grub on
+mkpart bios 2MiB 512MiB
+set 2 esp on
+mkpart pv 512MiB 100%
+```
+
+## LVM
+```
+pvcreate /dev/mmcblk0p3
+vgcreate odroidh2p-0 /dev/mmcblk0p3
+lvcreate -L 1g -n swap odroidh2p-0
+lvcreate -L 32G -n nixos odroidh2p-0
+```
+
+## Filesystems
+
+```
+mkfs.fat -F 32 -n boot /dev/mmcblk0p2
+mkfs.btrfs /dev/odroidh2p-0/nixos
+mkswap /dev/odroidh2p-0/swap
+# subvolume for rootfs and home
+# mount at /mnt/nixos
+mkdir -p /mnt/nixos/etc/boot/
+```
+
+## NixOS install
+
+FIXME: why was this necessary?
+```
+mkdir -p /mnt/nixos/etc/nixos/
+touch /mnt/nixos/etc/nixos/configuration.nix
+```