Date: Wed, 22 Jul 1998 11:34:16 -0500 From: Doug Ledford <dledford@dialnet.net> To: aic7xxx Mailing List <AIC7xxx@FreeBSD.ORG>, "Atalla, Mauro J." <mjatalla@MIT.EDU>, Juergen Hammelmann <juergen@tunix.mathematik.uni-stuttgart.de>, Lutz Vieweg <lkv@isg.de>, Chen Chi Ming Hubert <cmh_chen@MIT.EDU>, Tom Leidy <ogre@ptd.net> Subject: Dell 410 Workstations and Asus Motherboard systems Message-ID: <35B61488.982A2D5B@dialnet.net>
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Does someone want to fill me in on exactly what connectors there are on this
motherboard and what Dell claims can and can't be hooked up to these
things? Also, the Adaptec SCSI BIOS for the 7890 chipset, what are the list
termination options in that BIOS? Is it just manual configured, or is it
Auto-Term, or what?
Now, the same question for the Asus motherboard with the 7890 built in. I
suspect both are doing the same thing.
The reason I ask these questions is that I keep seeing messages from these
machines that talk about enabling the SE_low and SE_high byte terminations,
but it never mentions the LVD terminators. Did Dell hook up the LVD
terminators to the SE terminator pins or something (and also set the
detection logic to use the SE bits instead of the LVD bits)? IS this on
systems where Auto-Term is set, or is the termination set manually in the
Adaptec BIOS? If it's set manually, what does it say it's set to? What's
the deal with these things? I have a feeling that termination problems may
be a large part of the issue with the freezes during Inquiry commands. If
someone wants to do a quick test for me, they can do the following:
In the aic7xxx.c file, at line 6961, add a new line so that the code there
looks like this:
external_present = 1;
enableSE_high = enableSE_low = enableLVD_high = enableLVD_low = TRUE;
}
Let me know if that makes any difference on these Dell machines and on the
Asus motherboards.
--
Doug Ledford <dledford@dialnet.net>
Opinions expressed are my own, but
they should be everybody's.
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