jonathan
Sun Nov 17 15:58:32 PST 1996
Update of /cvsroot/src/sys/dev/ic
In directory netbsd1:/var/slash-tmp/cvs-serv8334

Modified Files:
	elink3.c elink3reg.h elink3var.h 
Log Message:
Fix for hanging 3com ``large packet'' (100Mbit) Etherlink-III devices:
  * Add a slot in the softc, ep_pktlenshift, to indicate that
    a board implements ``large packets'' (FDDI-sized frames) and
    therefore implicitly shifts the argument to packet-length commands
    by two bits to fit a 13-bit length in  an 11-bit command argument field.

 *  Change  the reset of station-mask filterto be independent of bus-type
    (e.g.,. for 3c515)

 * Replace  the "2044" constant used to disable TX threshold interrupts
   on 3c509-generation cards with a #define. Use 2047 instead,
   since that works on the large-packet cards (Vortex, Demon, Boomerang)
   and 2044 doesn't.

 *  Add code to  epconfing to probe for large-packet support,
    set the softc appropriately, and  shift packet sizes in commands
    by ep_pktlenshift to compensate  for the implicit shift.

 *  Tweak the epconfig() code to avoid hanging on startup.
    Set the Tx threshold to interrupt when there's space for
    a maximal-sized ether frame, then  do epinit() then epstop(),
    instead of just the Tx and Rx reset. Required on at least a 3c595.

Tested on  a 3c595, but not on 3c509-generation hardware.