[U-Boot-Users] Reading mediacard compressed files

Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.

Thanks, --Jr.