having problems bringing up Interphase 5575's under Linux

[<AAt...@ve...>]

Yes, it's me again, and i'm _still_ having problems with getting things
going.
I have 2 P133's that have interphase 5575-009 PCI ATM adapters installed.
A while back, i started with linux kernel 2.4.0-test10 / ATM on Linux
0.78, and
when i tried to load the IA driver built as a module, i was seeing
continuous
scrolling of:
    IA: SUNI carrier detected
on the console (a sight i've gotten all too familiar with!!!)
I got some really good suggestions from the group on things to investigate
and try.   Mercifully, i got another assignment to work on for a while,
too --
i _needed_ a break from this for a while...  but now i'm back at it, and
with no further luck.
Really frustrating, too -- i thought i was really onto something at the
beginning
of this week.  i had pretty much been handed the set-up i have (PCs,
adapters,
etc.) by a colleague who didn't have time to work on it at current, and
appropriate cabling to connect the ATM adapters had not yet been
ordered.  I went by what was in the User's Guide for the adapters to
determine what to order -- i guess the User's Guide is a bit out of date
as
for the 5575 it does not call out different versions and specifies
SC Duplex connector - 62.5/125 micron multimode fiber, min. 3 meter
length.  So I got a multimode fiber patch cord, and that's where i was
when last i posted.  Since then, on a visit to Interphase's web site,
I noticed that it listed different versions of the 5575; i checked into
what
i had, and they're 5575-009's -- according to the web site, those call
for _singlemode_ fiber!  AHA!  I thought "that's _gotta_ be it"!!!  I did
my
little happy dance, and exchanged the patch cord, thinking when i had
the singlemode fiber patch cord in hand, all would be well.
Unfortunately that was not the case -- I saw the same problem
again (and again, and again...)  even with the singlemode fiber patch
cord.   :-(
I have tried everything I can think of and all the suggestions you all
have
so kindly provided.  I've tried many kernel versions -- 2.2.4-test10,
2.2.4-test11, 2.2.4-test12 (all w/ atm 0.78).  i've dropped back to
2.2.9 w/ atm 0.59.
i've built kernels without ethernet support to eliminate the possibility
of interference there (these systems have ISA Etherlink III 3c509
adapters in them -- initially these boards and the ATM adapters
were both on IRQ 10,  i found a utility to configure the Ethernet
boards so they are now on IRQ 5) -- still had the same problem upon
installing the interphase driver.
On the Interphase ATM adapters, the green link LED's are lit,
as are the yellow status LED's (the status LED's never go to flashing,
which would indicate successful driver installation as per the manual).
At present, I'm running linux kernel 2.2.9 w/ atm 0.59 and the
interphase 5575 driver as downloaded from the Interphase web
site.  i've tried tracing through the driver with printk's (and
code to supress printk's after a few iterations, so i can
see the rest!)  to try to
see what's up (although i am running pretty blind here!)
here's what i know from that --  i see the MAC address display
and it gets through init_module().
Then it gets into ia_int() where status is 0x4 (STAT_FEINT)
which sends it off into IaFrontEndIntr(), which is where
it hits the printk which prints:
  IA: SUNI carrier detected
For some reason, though, it keeps looping through this --
ia_int() -> IaFrontEndIntr()
Why?  I dunno....   I tried something that's probably stupid --
in ia_int(), some other status bits are reset by writing a 1 to
that bit in the status register...  i tried doing that for
STAT_FEINT by adding:
*(u_int *)(iadev->reg+IPHASE5575_BUS_STATUS_REG) = STAT_FEINT;
before the call to IaFrontEndInt(), but that doesn't change things.
Peter Wang has said before this state indicates a board or
kernel problem.  It happens with both boards -- how likely is it they'd
both be bad?  So it must be my kernel configuration, but golly,
i've tried sooooo many different configurations....
i just don't have a clue.  if anyone has any ideas or suggestions,
i'd be most grateful.
oh, and Happy Holidays!!!  :-)
-anne