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From: mikebo@tellabs.com
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Subject: Re: 2.1.5R: aha0: DMA beyond end of ISA ?
To: gjennejohn@frt.dec.com
Date: Wed, 4 Dec 1996 19:16:35 -0600 (CST)
Cc: mikebo (Mike Borowiec), questions@freebsd.org
In-Reply-To: <9612041747.AA10824@cssmuc.frt.dec.com> from "garyj@frt.dec.com" at Dec 4, 96 06:47:07 pm
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Gary, et al. wrote:
> mikebo@tellabs.com writes:
> [delete]
> > Anyway, now every time I try to access the tape drives, I get:
> > aha0: DMA beyond end of ISA: 0x19cc0a0
> > st1: bad request, must be between 0 and 0
> > tar: read error on /dev/rst1: Input/Output error
> > 
> [delete]
> > --------------------------------------------------------------------------
> > FreeBSD 2.1.5-RELEASE #0: Sat Nov 30 19:19:25 CST 1996
> >     kroot@timesink.ttl.com:/usr/src/sys/compile/TIMESINK
> > CPU: 132-MHz Pentium 735\\90 or 815\\100 (Pentium-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x52c  Stepping=12
> >   Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
> > real memory  = 67108864 (65536K bytes)
> > avail memory = 63885312 (62388K bytes)
> [delete]
> 
> you need to enable bounce buffers, the ISA bus has only 24 bits and
> can only address 16MB. You have 64 MB. Add
> 
> options         BOUNCE_BUFFERS
> 
> to your kernel coniguration file and make a new kernel.
> 
Darrrrr.... I should've known...
It's just that I never had more than 16MB before. ;v)
- Mike