lkml.org 
[lkml]   [1997]   [May]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectPCI busmastering? Limitations? Hmm.


This is a really odd question, but I don't know the answer, and it affects
a rather important Linux box we're in the process of implementing.

This particular machine currently has a DEC DEFPA FDDI controller and two
3c905 cards in it. Upon adding a third 3c905 card, the system refuses to
ifconfig up the eth0 interface. My first suspicion is that you can't run a
machine with more than THREE PCI busmasters. I know for a fact that the
FDDI is _*always*_ a busmaster, at least according to the manual, and I'm
not intentionally setting the 3c905's as busmasters, although they may be
running in such a mode.

I haven't yet had any of the reputed problems with the 3c905's, other than
the cards not wanting to ifconfig up with three of them in a machine. It
isn't the cards, since I have 5 of them handy and have tried various
permutations of the three. =(

Mother board is a Tyan Titan VX
DEC FDDI card, obviously, well, here's the output from 'dmesg' for people
to peruse....

---start here---
tunnel: version v0.2b2
defxx.c:v1.04 09/16/96 Lawrence V. Stefani (stefani@lkg.dec.com)
fddi0: DEFPA at I/O addr = 0x6100, IRQ = 15, Hardware addr =
08-00-2B-B6-B6-DD
3Com EtherLink III: Overriding PCI latency timer (CFLT) setting of 32,
new val
ue is 255.
eth0: 3Com 3c905 Boomerang 100baseTx at 0x6200, 00:60:97:83:b0:f4, IRQ 11
Internal config register is 16302d8, transceivers 0xe040.
8K word-wide RAM 3:5 Rx:Tx split, autoselect/MII interface.
3Com EtherLink III: Overriding PCI latency timer (CFLT) setting of 32,
new val
ue is 255.
eth1: 3Com 3c905 Boomerang 100baseTx at 0x6300, 00:60:97:83:b0:54, IRQ 15
Internal config register is 16302d8, transceivers 0xe040.
8K word-wide RAM 3:5 Rx:Tx split, autoselect/MII interface.
3c59x.c:v0.30-all 12/23/96 becker@cesdis.gsfc.nasa.gov
ne.c:v1.10 9/23/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)
NE*000 ethercard probe at 0x300: 00 00 e8 c0 9f 13
eth3: NE2000 found at 0x300, using IRQ 7.
NE*000 ethercard probe at 0x340: 00 00 e8 c0 a1 87
eth4: NE2000 found at 0x340, using IRQ 10.
-----screen capture ends here-----


Any help would be much appreciated. If nothing else, I can always buy one
of the neat Cogent 4x100 cards... Anyone have good experience with
those? =)

--elijah
ewright@multipro.com
elw@wc.tntech.edu
TTU Water Center Systems Admin.



\
 
 \ /
  Last update: 2005-03-22 13:39    [W:0.211 / U:0.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site