Succesfully made it to section "5.2-Instructions" of the Zybo tutorial.  However, the following command fails:   ./u-boot-Digilent-Dev/tools/mkimage -A arm -T ramdisk -c gzip -d ./ramdisk8M.image.gz uramdisk.image.gz   My efforts have hit a brick wall as I  have no ramdisk8M.image.gz  (performed a find -name  "ram*").  Additionally, there is no mention of this file previously in the tutorial.   Does anyone have a suggestion for resolving the missing ramdisk8M.image.gz?   Please respond a