Ok, just for fun I tried pk's fd patch on hobbit (an ss2).

Hans Nasten wrote:
> I don't know if Sun ever built a sun4c with a 82077 floppy chip, but there are

Perhaps, but that's what NetBSD thinks my ss2 has...

SPARCstation 2, No Keyboard
ROM Rev. 2.4.1, 16 MB memory installed, Serial #4307982.
Ethernet address 8:0:20:10:1d:55, Host ID: 5541bc0e.


Rebooting with command: 
Boot device: /sbus/esp@0,800000/sd@3,0   File and args: netbsd
root on /sbus/esp@0,800000/sd@3,0 fstype 4.2
Boot: netbsd
Size: 827360+83264+88544 bytes
Copyright (c) 1982, 1986, 1989, 1991, 1993
        The Regents of the University of California.  All rights reserved.

NetBSD 1.0A (HOBBIT-fd) #0: Wed May 17 13:25:55 EST 1995
    root@hobbit:/usr/bsd_src/usr.src/sys/arch/sparc/compile/HOBBIT-fd
real mem = 16449536
avail mem = 14184448
using 200 buffers containing 819200 bytes of memory
mainbus0 (root)
cpu0 at mainbus0: SUNW,Sun 4/75 (RT601 or L64811 v2 @ 40 MHz, TMS390C602A FPU)
cpu0: cache chip bug; trap page uncached
cpu0: 65536 byte write-through, 32 bytes/line, hw flush cache enabled
memreg0 at mainbus0 ioaddr 0xf4000000
clock0 at mainbus0 ioaddr 0xf2000000: mk48t02 (eeprom)
timer0 at mainbus0 ioaddr 0xf3000000
auxreg0 at mainbus0 ioaddr 0xf7400003
zs0 at mainbus0 ioaddr 0xf1000000 pri 12, softpri 6
zs0a: console i/o
zs1 at mainbus0 ioaddr 0xf0000000 pri 12, softpri 6
audio0 at mainbus0 ioaddr 0xf7201000 pri 13, softpri 4
sbus0 at mainbus0 ioaddr 0xf8000000: clock = 20 MHz
dma0 at sbus0 slot 0 offset 0x400000: rev 1+
esp0 at sbus0 slot 0 offset 0x800000 pri 3: ESP100 20Mhz, target 7
scsibus0 at esp0
esp0 targ 3 lun 0: <SEAGATE, ST1480   SUN0424, 5826> SCSI2 0/direct fixed
sd0 at scsibus0: 411MB, 1476 cyl, 9 head, 63 sec, 512 bytes/sec
le0 at sbus0 slot 0 offset 0xc00000 pri 5: hardware address 08:00:20:10:1d:55
bf at sbus0 slot 2 offset 0x0 not configured
cgsix0 at sbus0 slot 3 offset 0x0: SUNW,501-1672, 1152 x 900, rev 6
fdc0 at mainbus0 ioaddr 0xf7200000 pri 11, softpri 4: chip 82077
							   ^^^^^^
root on sd0a

then it hangs.  The only change between that kernel and the normal one is: 

--- HOBBIT      Thu Apr 20 12:36:26 1995
+++ HOBBIT-fd   Wed May 17 11:59:02 1995
@@ -129,8 +129,8 @@
 cd*    at scsibus? target ? drive ?
 
 # <sjg> don't think this works...
-#fdc0  at mainbus0
-#fd*   at fdc0
+fdc0   at mainbus0
+fd0    at fdc0
 
 pseudo-device  loop
 pseudo-device  pty     64