[ BeagleBoard ]: How to transform tgz file system ( built with angstrom Narcissus ) to ramdisk.gz


I've created a custom rootfs using narcissus ( angstrom narcissus ).
Now i would like to trasform the file system in a image file ( so i
can mount
it like a loopback device ) . And then craete a gz file using gzip -9


The file uImage ( kernel image ) which is in the boot folder in the
file system created by
narcissus, is the which one i've to put in SD card to make u-boot load
the kernel???

Thank's in advance,


Hope it helps