From owner-freebsd-current  Fri May  3 01:23:06 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id BAA11050
          for current-outgoing; Fri, 3 May 1996 01:23:06 -0700 (PDT)
Received: from luke.pmr.com (luke.pmr.com [206.224.65.132])
          by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id BAA11045
          Fri, 3 May 1996 01:23:01 -0700 (PDT)
Received: (from bob@localhost) by luke.pmr.com (8.7.5/8.6.9) id DAA14478; Fri, 3 May 1996 03:23:15 -0500 (CDT)
From: Bob Willcox <bob@luke.pmr.com>
Message-Id: <199605030823.DAA14478@luke.pmr.com>
Subject: Re: ahc driver no longer sees one of my disks
To: gibbs@freefall.freebsd.org (Justin T. Gibbs)
Date: Fri, 3 May 1996 03:23:15 -0500 (CDT)
Cc: freebsd-current@freefall.freebsd.org
In-Reply-To: <199605030439.VAA23683@freefall.freebsd.org> from "Justin T. Gibbs" at "May 2, 96 09:39:07 pm"
X-Mailer: ELM [version 2.4ME+ PL11 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-current@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

Justin T. Gibbs wrote:
> >Since replacing my 100MHz Pentium CPU with a 166MHz CPU, the Adaptec
> >2940 device driver no longer sees one of my SCSI disks, my Toshiba
> >3701 CDROM, or my Wangtek 5525ES tape drive (the adapter's BIOS
> >does).  What I use to get (before the CPU change) for boot output
> >was:
> >
> 
> The driver uses DELAY() to perform the SCSI bus reset.  Perhaps its not
> long enough in your new system.  My other guess is that the bus settle
> delay isn't long enough.  What's the value of SCSIDELAY in your kernel?
> Is DELAY() really so dependant on the CPU speed?  Can we get a better
> DELAY() macro?

My SCSI_DELAY is set to 15 seconds and the system does appear to 
wait for that length of time (as measured with a stop watch).

Some, possibly relavent, other boot messages I get are:

Calibrating clock(s) relative to mc146818A clock ... i586 clock: 166189614 Hz, i8254 clock: 1193157 Hz
CLK_USE_I8254_CALIBRATION not specified - using default frequency
CLK_USE_I586_CALIBRATION not specified - using old calibration method
i586 clock: 0 Hz
CPU: Pentium (166.18-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x52c  Stepping=12
  Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>

Also, incase its any help, rebooting with the -v flag yields the
following ahc msgs:

ahc0 <Adaptec 2940 SCSI host adapter> rev 3 int a irq 12 on pci0:10
        mapreg[10] type=1 addr=0000e000 size=0100.
        mapreg[14] type=0 addr=fb3f6000 size=1000.
ahc0: BurstLen = 8DWDs, Latency Timer = 32PCLKS
ahc0: Reading SEEPROM...done.
ahc0: aic7870 Single Channel, SCSI Id=7, 16 SCBs
ahc0: Downloading Sequencer Program...Done
ahc0: Probing channel A
ahc0 waiting for scsi devices to settle
ahc0: target 0 synchronous at 10.0MHz, offset = 0xf
(ahc0:0:0): "QUANTUM PD700S 3110" type 0 fixed SCSI 2
sd0(ahc0:0:0): Direct-Access 668MB (1368432 512 byte sectors)
sd0(ahc0:0:0): with 2448 cyls, 8 heads, and an average 69 sectors/track
ahc0: target 1 synchronous at 10.0MHz, offset = 0xf
(ahc0:1:0): "DEC DSP3105S X385" type 0 fixed SCSI 2
sd1(ahc0:1:0): Direct-Access 1001MB (2050860 512 byte sectors)
sd1(ahc0:1:0): with 2570 cyls, 14 heads, and an average 57 sectors/track


-- 
Bob Willcox
bob@luke.pmr.com
Austin, TX