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From: Ulf Zimmermann <ulf@Lamb.net>
Message-Id: <199608122106.OAA03983@Gatekeeper.Lamb.net>
Subject: Re: 2 AHA1542's in one box
To: narvi@haldjas.folklore.ee (Narvi)
Date: Mon, 12 Aug 1996 14:06:08 -0700 (PDT)
Cc: freebsd-scsi@freebsd.org, hackers@freebsd.org
In-Reply-To: <Pine.BSF.3.91.960812223426.7380I-100000@haldjas.folklore.ee> from Narvi at "Aug 12, 96 10:35:34 pm"
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> 
> 
> On Mon, 12 Aug 1996, Mark Murray wrote:
> 
> > Hi
> > 
> > Does anyone have any experience in putting 2 AHA1542 cards into one
> > box?
> > 
> > I tried this and have had no luck. Here is the saga:
> > 
> > The first card is set to factory default and is an AHA1542C. The
> > second has been moved to Port 0x240 DRQ 6 IRQ 9 and is an AHA1542B.
> > After lots of fun-and-games while I actually got the card's strapping
> > right :-), I can get the 1542C ^A-BIOS to do a diagnostic run on both
> > cards and to probe for devices on both cards.
> > 
> > Now - the first card works just fine. The second probes OK during
> > FreeBSD boot, but hangs solid during the "waiting for SCSI devices
> > to settle" pause. I have checked _everything_. The terminators are
> > OK, the card works (strapped to factory default) in another machine,
> > There are no DRQ/PORT/IRQ conflicts.
> > 
> > The motherboard is a Megabyte G486 with an i486DX/50 and 16MB of RAM.
> > 
> > Any clues?
> 
> Hmm.... I'm not an expert with the Adaptec cards or with the PC bus 
> designs, but wasn't it so that there could be only one bus master on the 
> ISA bus? 
> 
> 	Sander
> 
> > 
> > M
> > -- 
> > Mark Murray
> > 46 Harvey Rd, Claremont, Cape Town 7700, South Africa
> > +27 21 61-3768 GMT+0200
> > Finger mark@grondar.za for PGP key
> > 
> 

And another idiotic tale survived. No, it is not true. You can have more then 1
busmaster. To be exact if you have a CPU, a DMA chip and an Adaptec 1542, you
already have 3 bus master ;-)

Ulf. 

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Ulf Zimmermann, 1525 Pacific Ave., Alameda, CA-94501, #: 510-865-0204
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