Having my first run through with tdisp and make stops at this line:
include $(CHIBIOS)/os/various/fatfs_bindings/fatfs.mk
That directory didn't exist on my ChibiOS installation (new as of yesterday), I did find fatfs-0.8b-patched.zip which unpacked itself to ChibiOS/ext/fatfs and within that was fatfs.mk
Amending the makefile line to:
include $(CHIBIOS)/ext/fatfs/fatfs.mk
seems to work although I haven't finished yet mostly because I am learning new bits about make as I go along...
Cheers,
Chris