There is a good start to finish guide here, but for clarity and simplicity - I'll outline them here too.
First identify where your Linux OS has attached your SD card (mine was the same as this guide, /dev/sdb). Typing dmesg and examining the output will most often be the easiest way to find this. For these instructions, we'll assume yours is also attached to /dev/sdb
We need to ensure the device is not mounted anywhere first (Ubuntu, for example, will automatically try to mount removable media in /media/[device-name]
sudo umount /dev/sdb
Next, remove all existing partitions (and also, data - make sure this card is not important, backed up etc.)
sudo parted -s /dev/sdb mklabel msdos
Data removed, we'll need to create two partitions. The first being FAT32 which will become the system / boot partition for OpenELEC. The second, an EXT file system for OpenELEC using all remaining space on the card.
sudo parted -s /dev/sdb unit cyl mkpart primary fat32 -- 0 16 sudo parted -s /dev/sdb set 1 boot on
sudo parted -s /dev/sdb unit cyl mkpart primary ext2 -- 16 -2
This should give you your two required partitions. Next, you will need to format these new partitions.
sudo mkfs.vfat -n System /dev/sdb1 sudo mkfs.ext4 -L Storage /dev/sdb2
At this point, it's best to pop the card out and reinsert it to have the OS recognise the new partitions and if you're lucky - mount them for you. Otherwise, you'll need to create some mount points and reload the cards partitions manually.
sudo partprobe sudo mkdir /mnt/System sudo mkdir /mnt/Storage sudo mount /dev/sdb1 /mnt/System
Now, it's as simple as copying the files from my zipfile into the right places. Extract everything to an easy to access directory, we'll use /tmp. Copy the files across (note - some of them need to be renamed which is taken care of in the code below). Then make sure you're not in a mounted directory and unmount the SD card. Fingers crossed, it should be ready for use!
sudo cp /tmp/OpenELEC-RPi.arm-devel-20120514154309-r10954.kernel /mnt/System/kernel.img sudo cp /tmp/OpenELEC-RPi.arm-devel-20120514154309-r10954.system /mnt/System/SYSTEM sudo cp /tmp/bootcode.bin /mnt/System/ sudo cp /tmp/loader.bin /mnt/System/ sudo cp /tmp/arm128_start.elf /mnt/System/start.elf cd / sudo umount /dev/sdb