--[ Archlinux on RPI2 ]

SD Card Creation
Replace sdX in the following instructions with the device name for the SD card as it appears on your computer.

Start fdisk to partition the SD card:
fdisk /dev/sdX

At the fdisk prompt, delete old partitions and create a new one:
-Type o. This will clear out any partitions on the drive.
-Type p to list partitions. There should be no partitions left.
-Type n, then p for primary, 1 for the first partition on the drive, press ENTER to accept the default first sector, then type +100M for the last sector.
-Type t, then c to set the first partition to type W95 FAT32 (LBA).
-Type n, then p for primary, 2 for the second partition on the drive, and then press ENTER twice to accept the default first and last sector.
-Write the partition table and exit by typing w.

Create and mount the FAT filesystem:
mkfs.vfat /dev/sdX1
mkdir boot
mount /dev/sdX1 boot

Create and mount the ext4 filesystem:
mkfs.ext4 /dev/sdX2
mkdir root
mount /dev/sdX2 root

Download and extract the root filesystem (as root, not via sudo):
wget http://archlinuxarm.org/os/ArchLinuxARM-rpi-2-latest.tar.gz
bsdtar -xpf ArchLinuxARM-rpi-2-latest.tar.gz -C root
sync

Move boot files to the first partition:
mv root/boot/* boot

Unmount the two partitions:
umount boot root

Insert the SD card into the Raspberry Pi, connect ethernet, and apply 5V power.

Use the serial console or SSH to the IP address given to the board by your router.

Login as the default user alarm with the password alarm.
The default root password is root.

--[ Boot RPI with NFS storage ]--

Booting XBMC OpenELEC with NFS storage

I have had a raspberry pi type B for a few weeks now and one problem that I have is on the SD card which can get stressed and corrupt XBMC data. I was looking for a solution tonight and eventually stepped on it reading a few pages from the wiki. Since I still want to use the SD card, I just changed/flash/cmdline.cfg to contain this:

1	ip=dhcp boot=/dev/mmcblk0p1 disk=NFS=192.168.0.66:/media/xbmc

Of course, you will need to change the NFS server and mount point as they are likely to be different. Worth noting that I rsync’d the content of /dev/mmcblk0p2 (/storage in OpenELEC) so I would not have to scan my whole collection again.

There is also a full procedure to netboot your Raspberry Pi but this did not appeal to me, details there.