uboot-mkimage 0.4build1 (powerpc binary) in ubuntu lucid

 This package contains the mkimage utility, which encapsulates a compressed
 "uImage" Linux kerel image with header information, CRC32 checksum, etc,
 for use with the U-Boot bootloader.
 .
 mkimage can also be used to create ramdisk images for use
 with U-Boot, either separated from the Linux kernel image, or
 combined into one file. mkimage encapsulates the images with a 64
 byte header containing information about target architecture,
 operating system, image type, compression method, entry points, time
 stamp, CRC32 checksums, etc.