Puppy 2.17, usbflash, frugal, all files located in /boot/puppy Also with using the psubdir Variable (psubdir=boot/puppy), puppy is not booting, because it can't find the file pup_217.sfs. The Problem is the function loadpupsfsfunc() in /initrd/sbin/init. It tries to get /pup_217.sfs instead of /boot...