In preparation for use with sansapatcher, change portalplayer bootloaders to read firmwares in mi4 format. 
When loading the OF:
1) first try to load from a hidden disk partition
2) try loading /System/OF.mi4
3) finally fall back to loading /System/OF.bin which is what the old bootloader used.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12802 a1c6a512-1295-4272-9138-f99709370657
8 files changed