Sometimes you may want to store
some data in compressed format (for example to save flash memory), while
your application needs the data in uncompressed form. You can trick U-Boot
to do this uncompressing like this:
Generate a compressed U-Boot image of type "standalone" (="mkimage ... -T
standalone -C gzip ..."=) and make sure that the envrionment variable
is set to
(i. e. enter
"setenv autostart no;saveenv"
). If you then use "bootm" for such an
image, U-Boot will uncompress the contents of the image and store it at the
"load address" (
option for mkimage), but not attempt to start it yet.
If the image contains executable code, you can omit the setting of
"autostart", and U-Boot will automagically start the image by jumping
to the entry point address ("-e" option for mkimage).