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Message-ID: <19980123175204.39831@lemis.com>
Date: Fri, 23 Jan 1998 17:52:04 +1030
From: Greg Lehey <grog@lemis.com>
To: Donald Acton <acton@opentext.com>
Cc: freebsd-questions@FreeBSD.ORG, acton@vn.opentext.com
Subject: Re: DMA beyond end of ISA in 3.0
References: <199801230717.XAA13879@stoner.nsg.bc.ca>
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In-Reply-To: <199801230717.XAA13879@stoner.nsg.bc.ca>; from Donald Acton on Thu, Jan 22, 1998 at 11:17:56PM -0800
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On Thu, Jan 22, 1998 at 11:17:56PM -0800, Donald Acton wrote:
>
> I am not sure this is the correct group to post this problem to so if
> it isn't pointers to the appropriate place would be appreciated.
>
> I recently changed my 2.2.5 system to run the Dec 25 snap release of
> 3.0. Before making the change I backed up my system on to a SCSI DAT
> device. After making the change I tried to access the dump tapes I
> made and I got errors of the following form:
>
> aha0: DMA beyond end Of ISA: 0x12bad10
>
> and accesses to the drive fail with tape i/o errors. Since then I have
> tried some the newer SNAP releases and the problem remains. I have
> searched the FreeBSD web site in the bug lists and mailing lists and
> there are some mentions of this problem as far back as the summer of
> '97, but no followups, as far as I could find, indicating how to fix
> the problem. In addition to having problems with the SCSI tape, there
> are also problems with the SCSI CDROM device. IF there isn't a disk in when
> the machine boots then I can't mount the CD and there are similar DMA
> errors reported.

> The system configuration is
>
> FreeBSD 3.0-980117-SNAP #0: Sun Jan 18 22:21:07 PST 1998
>     acton@comox.nsg.bc.ca:/usr/src/sys/compile/Comox
> CPU: Pentium (74.70-MHz 586-class CPU)
>   Origin = "GenuineIntel"  Id = 0x525  Stepping=5
>   Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
> real memory  = 33554432 (32768K bytes)
> avail memory = 30208000 (29500K bytes)
> aha0 at 0x330-0x333 irq 11 drq 5 on isa
> aha0: waiting for scsi devices to settle

This is probably because your kernel is built without the line

options		BOUNCE_BUFFERS		#include support for DMA bounce buffers

You need these with ISA DMA devices like your Adaptec 154x if you have
more than 16 MB memory.

Greg