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Date:      Thu, 16 Apr 1998 14:57:38 -0700 (PDT)
From:      Brian Beattie <beattie@aracnet.com>
To:        Jim Bryant <jbryant@unix.tfs.net>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: Help - please... Adaptec 1542 and Exabyte tape problem...
Message-ID:  <Pine.LNX.3.96.980416145549.14387A-100000@shell2.aracnet.com>
In-Reply-To: <199805201806.NAA10019@unix.tfs.net>

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On Wed, 20 May 1998, Jim Bryant wrote:

> In reply:
> > On Wed, 15 Apr 1998, Tom wrote:
> > 
> > > 
> > > On Thu, 16 Apr 1998, Kerry Morse wrote:
> > > 
> > > > Apr 16 13:35:05 proxy /kernel: aha0: DMA beyond end Of ISA: 0x357cd10
> > > 
> > >   Bounce buffers are required to DMA above the 16MB for ISA devices.
> > > However, bounce buffers do not work for the aha driver (it is unclear
> > > whether the driver or the bounce buffers are broken).
> > > 
> 
> crap..  i just sold my 1542cf for this very reason...  i was wanting
> it to handle low-bandwidth stuff like the CD-ROM, M-O drive, and DDS-2
> tape drive, but I kept getting the above messages...  now i've got a
> heck of a lot of stuff hanging off my 2940UW...  i of course have
> 'OPTION BOUNCE_BUFFERS' in my config...
> 

I may be mistaken but I believe that the 2940UW is a PCI card.  That being
the case it does not require bounce buffers.  The 2940UW is already
supported by the CAM code.


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