SCSI Timeout with Adaptec 2940UW Rev. E (Bios 1.32)

[Doug Ledford]

Gerard Metrailler Jr. wrote:
> 
> Hello,
> 
> I hope this problem has not been resolved lately as I just subscribed to
> this mailinglist ;-)
> 
> Here is my problem. I was using a Adaptec 2940 (Bios 1.16) until
> recently and ervery thing was perfect. But I just changed for an Adaptec
> 2940UW Rev. E (Bios 1.32) lately when I bought a Quantum 4.5Gb UW Viking
> disk. Since then, I get SCSI Timeouts when I make a big access under
> Linux.

Try the 5.0.18 aic7xxx driver and let me know if this still happens.  There
are negotiation fixes in there that might make a difference, and there is
still one thing I'm looking into.  Specifically, I suspect some of the cards
and/or motherboard chipset setups don't properly initialize the STPWLEVEL
bit in the DEVCONFIG register at startup.  Currently, the driver can't set
this for the BIOS because at least for motherboards the proper setting of
this bit is implementation specific and we have no way of checking (I've
verified this on at least one motherboard chipset product where the correct
STPWLEVEL setting is 0, while on most aic7xxx based cards, the correct level
is 1).  This can introduce problems since the correct setting of this bit is
vital to making sure that when we actually enable termination on a chipset,
that the termination is *really* turned on.  This could also have an impact
on why some systems seem to never be able to run without timeouts and reset
cycles....

-- 

 Doug Ledford  <dledford at dialnet.net>
  Opinions expressed are my own, but
     they should be everybody's.

NOTE: I'm just now starting to recover from the Linux-Expo.  Most
      importantly, I'm just now getting around to answering a lot
      of my email.  So, if your message has lain around un-answered
      for many days, I apologize.

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