Model: Quadra 900
IOP ADB: OK.
53C94/53C96 SCSI: OK.
SONIC ethernet: OK.
SWIM (IOP) floppy disk controller: No driver.
Many low-end Macs were fitted with a defective 68LC040 processor (Penguin can tell you the processor type used in your Mac.)
See the FAQ for information about this issue.
Please send corrections and new results to the linux-m68k or debian-68k mailing list.