Date: Mon, 19 Nov 2001 18:13:18 +0100 From: "Jose M. Alcaide" <jose@we.lc.ehu.es> To: scsi@FreeBSD.org Subject: weird problems with on-board Adaptec 7880 Message-ID: <20011119181318.C337@v-ger.we.lc.ehu.es>
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I have a system based on a three-year-old Iwill PIILS motherboard. This
mobo includes an AIC7880 controller, which supplies a Ultra Wide SCSI
channel. There are two SCSI connectors (68-pin wide and 50-pin narrow) on
the motherboard.
A few days ago I transplanted the motherboard to another system and I
attached some devices to its SCSI channel. I inmediately got speed
negotiation problems, and I tried several bus arrangements to no avail.
This is *not* a cabling or termination problem; I borrowed an Adaptec
2940U card from another machine, and I attached the same devices using the
*same* cables and arrangement. Obviously, everything worked fine. In
particular, the speed negotiated by the 2940U with an external DLT 4000
was 10 MB/s (10 MHz) (there were also a CD-ROM and CD-RW, both Ultra SCSI
20 MB/s, 20 MHz).
Currently I have *only* one device attached: the external DLT 4000 unit
(fast narrow SCSI). There is a flat 50-way cable from the appropriate
connector on the motherboard to an external micro-SCSI connector; from
here to the DLT there is a single standard SCSI cable, and I attached an
active terminator to the DLT's free SCSI connector, of course. Everything
is correct.
I entered the SCSI-select utility of the onboard AIC7880 and tried all
kind of things. Surprisingly, sometimes I achieved the 10 MHz sync speed
after enforcing a limit of 5 MB/s (!) for the DLT target. Weird. Anyway,
it did not work at all. Even a simple "mt status" gets hung until I reset
the bus.
I am suspecting of problems with the SEEPROM. Maybe the ahc(4) driver does
not understand correctly the settings it reads from the SEEPROM... I don't
know. I found a option called "AHC_DUMP_EEPROM"; I can turn it on if it
could be useful.
Here is an excerpt from the "boot -v" messages:
ahc2: <Adaptec aic7880 Ultra SCSI adapter> port 0xe400-0xe4ff mem 0xe5903000-0xe5903fff irq 14 at device 20.0 on pci0
ahc2: Reading SEEPROM...done.
ahc2: Low byte termination Enabled
ahc2: High byte termination Enabled
ahc2: Downloading Sequencer Program... 439 instructions downloaded
aic7880: Ultra Wide Channel A, SCSI Id=7, 16/255 SCBs
...
Waiting 15 seconds for SCSI devices to settle
noperiph:ahc2:0:-1:-1): SCSI bus reset delivered. 0 SCBs aborted.
...
(ahc2:A:5:0): Sending SDTR period 2b, offset f
(ahc2:A:5:0): Received SDTR period 2b, offset f
Filtered to period 2b, offset f
ahc2: target 5 synchronous at 5.7MHz, offset = 0xf
(ahc2:A:5:0): Sending SDTR period 2b, offset f
(ahc2:A:5:0): Received SDTR period 2b, offset f
Filtered to period 2b, offset f
sa0 at ahc2 bus 0 target 5 lun 0
sa0: <Quantum DLT4000 D782> Removable Sequential Access SCSI-2 device
sa0: Serial Number DK937R0392
sa0: 5.813MB/s transfers (5.813MHz, offset 15)
**NOTE:** the SCSI-select utility offers only two choices for bus
termination: "High ON/Low Auto" or "High OFF/Low OFF". If I attach devices
to both SCSI onboard connectors (wide and narrow), the "boot -v" messages
keep saying "Low byte termination enabled". Is that the expected behavior?
I forgot to say that this machine is running 4.4-STABLE (dated November
14th). I am willing to try *anything*. I can modify the ahc(4) sources if
needed. Any help, idea or suggestion will be greatly welcome!
Thanks in advance,
JMA
--
****** Jose M. Alcaide // jose@we.lc.ehu.es // jmas@FreeBSD.org ******
** "Beware of Programmers who carry screwdrivers" -- Leonard Brandwein **
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