Dell 410 Workstations and Asus Motherboard systems

[Tom Leidy]

On Wed, 22 Jul 1998, Doug Ledford wrote:

> 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.

I didn't see any mention of termination, beyond 
"Host Adapter SCSI Termination" (which was enabled by default)

> 
> 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.
> 

No noticable difference for my Asus:

(scsi0:0:0:0) Sending command 29/0x4 to QINFIFO
(scsi0:-1:-1:-1) Sending commands to QINFIFO
scsi : aborting command due to timeout : pid 1, scsi0, channel 0, id 0, lun 0 0x
12 00 00 00 ff 00
aic7xxx driver version 5.1.0pre5/2.0.35
Controller type: Adaptec AIC-7890/1 Ultra2 SCSI host adapter
p->flags=0x904501, p->chip=0x406, p->features=0xf6, sequencer isn't paused
SIMODE0=0x0, SIMODE1=0xac, SSTAT0=0x0, SSTAT1=0x3, INTSTAT=0x0
SCSISIGI=0x44, SXFRCTL0=0x80, SXFRCTL1=0x27, SCSISEQ=0x12, SEQCTL=0xb0
SCSIRATE=0x0, SCSIOFFSET=0, SEQADDR=0x61, LASTPHASE=P_DATAIN
(scsi0:0:0:0) dev_flags=0x21, WDTR:N/Y/Y, SDTR:N/N/N, q_depth=1:1:3
(scsi0:0:0:0) targ_scsirate=0x0, targ_offset=0
Timed out command is scb #29:
Tag29: flags=0x4, control=0x40, TCL=0x0, Sent
QINFIFO: (TAG)
Current SCB: (SCBPTR/TAG/CONTROL) 0/29/0x40
WAITING_SCBS: (SCBPTR/TAG/CONTROL) 255->
DISCONNECTED_SCBS: (SCB/TAG/CONTROL) 255->
FREE_SCBS: (SCBPTR/TAG/CONTROL) 1->1/255/0x0 2/255/0x0 3/255/0x0 4/255/0x0 5/255
/0x0 6/255/0x0 7/255/0x0 8/255/0x0 9/255/0x0 10/255/0x0 11/255/0x0 12/255/0x0 13
/255/0x0 14/255/0x0 15/255/0x0 16/255/0x0 17/255/0x0 18/255/0x0 19/255/0x0 20/25
5/0x0 21/255/0x0 22/255/0x0 23/255/0x0 24/255/0x0 25/255/0x0 26/255/0x0 27/255/0
x0 28/255/0x0 29/255/0x0 30/255/0x0 31/255/0x0
<stop>



tom


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