Jasper is a tool to configure preinstalled ext2/3 images that were created using the ubuntu infrastructure from the initramfs. Such as armel omap3/4 images in Ubuntu 10.10 and beyond.

It grows the system partition of a preinstalled ext2/3 image to the full size of the SD card, configures fstab, loopback networking, adds the UUID to the kernel cmdline and properly sets up flash-kernel for the kernel package post installation scripts.