The following command can be used for generation fsl-image-full.ext2.gz.u-boot file:
mkimage -A ppc -O linux -T ramdisk -C gzip -n ' fsl-image-full.ext2.gz.uboot' -d fsl-image-full.ext2.gz fsl-image-full.ext2.gz
See documentation for mkimage ustility.
Check please size of memory on your board for using this file as RAM file system.
Have a great day,
Pavel Chubakov
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