Hi,
you're supposed to install crux-ppc or any other gnu/linux distribution on a filesystem that provides all the permissions and attributes a unix system needs, like ext3/ext2, reiserfs, xfs, jfs.
FAT filesystems are not supported for the root nor any other system partition of crux-ppc or any other distro. You could try using UMSDOS (that's an overlay filesystem
http://en.wikipedia.org/wiki/UMSDOS; i used it once a decade ago with slackware, but it's not adviceable at all and extremely slow).
The bulk crux-ppc kernels don't support umsdos, i don't even know whether its support is still in recent kernels; if it is you could try it compiling your own kernel.
If you're using the ready to use image, give a look here:
http://cruxppc.sunsite.dk/downloads/cru ... i-1.README
you need an ext2/ext3 filesystem on the system partition (even if it's a flash-drive you can partition it); you can play with inode density, block size or journal size (i advice the smallest journal possible on flash memories) to increase performance or reliability. I advice to mount partitions with noatime,nodiratime options.
Please ask again if you need further help on installing!
byez,