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Date: Fri, 1 Mar 1996 01:28:04 +0200 (EET)
From: Tomi Vainio <tomppa@fidata.fi>
Message-Id: <199602292328.BAA02445@zeta.fidata.fi>
To: Nate Williams <nate@sri.MT.net>
Cc: questions@freebsd.org
Subject: Re: Backup problem
In-Reply-To: <199602292321.QAA13183@rocky.sri.MT.net>
References: <199602292125.XAA02246@zeta.fidata.fi>
	<199602292321.QAA13183@rocky.sri.MT.net>
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Nate Williams writes:
 > > I changed bt driver to aha (AMI SCSI controller is compatible with
 > > buslogic 742a and Adaptec 1542). With aha driver backupping works like
 > > a charm. Making full backup taked over an hour but it worked
 > > smoothly. I even tried it twice. Any good explanations?
 > 
 > Yep, I'll bet the bounce buffer code is enabled on the aha driver and
 > might not be on the buslogic.
 > 
 > >  > real memory  = 33554432 (32768K bytes)
 > 
 > This is important if you have more than 16MB and your card can't do DMA
 > above 16MB.
 > 
 > >  > bt0: Bt747S/ 0-(32bit) bus
 > 
 > The bt driver assumes it can.
 > 
AMI SCSI adapter is EISA bus master and it also can do DMA over 16MB
memory in Adaptec 1542 compability mode but FreeBSD driver doesn't
support it. I'm not using options BOUNCE_BUFFERS when running this
card in Buslogic 742a EISA mode but with Adaptec driver FreeBSD wont
even boot without it.

  Tomppa