This page describes how to install a Jaunty RC image to an iMX51 Babbage board.
Preparation and image writing
First of all you need to download the RC Image to a large enough SD card (1GB will suffice); SanDisk were reported as better supported.
For writing the image either use the usb-imagewriter tool which you can install from the Jaunty universe archive (packages for Hardy (8.04) and Intrepid (8.10) can be found at the usb-imagewriter PPA) or follow the commandline method below.
sudo dd bs=4M if=./ubuntu-9.04-rc-desktop-armel.img of=/dev/mmcblk0
(assuming your SD card is called /dev/mmcblk0)
You'll also need an USB mass storage device or a SATA disk as the target installation device; 8 GB is the recommended size for a desktop install.
There are known power issues with the USB ports on the board, the safest way to work around this is to use a powered USB HUB to attach your target device to the board.
Starting the live system
Plug the SD card into the SD card slot and power up your board, it will boot into a live session.
Starting the installer
Just doubleclick the "Install" icon on the desktop and follow the normal install procedure.
Note that it's hard to install to the SD card (/dev/mmcblk0) itself, you would have to create the partitions manually yourself first; it's preferable to install to an USB mass storage device or to a SATA disk instead.
You need to leave your SD card in the board as the boot device: the babbage currently only boots from SD. It will load your target installed system.
If you experience any other bugs, please report them with the ubuntu-bug tool that is installed on your system.