From owner-freebsd-hackers  Wed Jan  8 10:29:46 1997
Return-Path: <owner-hackers>
Received: (from root@localhost)
          by freefall.freebsd.org (8.8.4/8.8.4) id KAA21989
          for hackers-outgoing; Wed, 8 Jan 1997 10:29:46 -0800 (PST)
Received: from smtp-gw01.ny.us.ibm.net (smtp-gw01.ny.us.ibm.net [165.87.194.252])
          by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id KAA21983
          for <Hackers@FreeBSD.ORG>; Wed, 8 Jan 1997 10:29:39 -0800 (PST)
Received: (from uucp@localhost) by smtp-gw01.ny.us.ibm.net (8.6.9/8.6.9) id SAA207537; Wed, 8 Jan 1997 18:28:10 GMT
Message-Id: <199701081828.SAA207537@smtp-gw01.ny.us.ibm.net>
Received: from slip166-72-229-200.va.us.ibm.net(166.72.229.200) by smtp-gw01.ny.us.ibm.net via smap (V1.3mjr)
	id smaJhcCkR; Wed Jan  8 18:27:55 1997
Reply-To: <SimsS@IBM.Net>
From: "Steve Sims" <SimsS@IBM.Net>
To: "Terry Lambert" <terry@lambert.org>
Cc: <Hackers@FreeBSD.ORG>
Subject: Re: Bounce Buffers and CCD
Date: Wed, 8 Jan 1997 13:27:23 -0500
X-MSMail-Priority: Normal
X-Priority: 3
X-Mailer: Microsoft Internet Mail 4.70.1155
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> From: Terry Lambert <terry@lambert.org>
>> (Terry, I hope I haven't quoted you out of context, but I'm here to tell 
>> ya': BOUNCE-BUFFERS is a MANDATORY option for >16M systems, at least on
>> 3.0-CURRENT with my mo-bo having PCI, ISA and VESA!)
> 
> Then it's not required AND it's broken.  8-(.
> 
> Bounce conditions are supposed to be autodetected.

Would that it were true....

> What controller are you using? (PCI/VESA/ISA?)

Plain-vanilla ISA flavor Adaptec 1542-CF, Firmware 2.02 (IIRC), defaults all
around: 0x330, IRQ:11 DRQ:5

> How many address lines are propagated, if PCI/VESA? (24/32?)

Beats me.  How can I find out?  (Not that I'm sure it matters, being an
ISA-centric failure.

> It may be that your motherboard is broken... literally, the config
> BOUNCE_BUFFERS option is defined as turning on bouncing in conditions
> where it is not supposed to be required according to the hardware
> specifications for the busses involved.

It may be the motherboard loses.  It's pretty old; no-name P-5/90.  I've got
a Mach-32 card in a PCI slot, everything else is ISA; ports, SCSI.
If we need more granularity to determine why this board fails, I'll pop it
out and decipher the silk screening.  Say the word.

> If you are using an ISA bus mastering DMA controller, it's supposed
> to be handled.  If you are using nything else, it's supposed to be
> unnecessary; if you find it necessary for non-ISA hardware, your
> motherboard is not standards compliant and you should contact the
> manufacturer (and send mail with make/model/revision to the hardware
> list maintainers for a "don't anyone else buy one of these" note).

"Supposed" being the operative term here... ;-)


...sjs...