Date: Tue, 1 Apr 1997 12:52:51 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: gemohler@c-com.net (Geoff Mohler) Cc: current@freebsd.org Subject: Re: Bounce Buffers Message-ID: <199704011752.MAA02576@dyson.iquest.net> In-Reply-To: <Pine.BSF.3.91.970401085538.1730Z-100000@dyslexic.phoenix.net> from Geoff Mohler at "Apr 1, 97 08:58:08 am"
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> I was getting this on a stock 2.2.1 installation: > > Panic: Bounce Buffers Out Of Range > =-=-=-=-=- > > I got this when I took the GENERIC *or any* Kernel definition file, and > added the line: > options "MAXMEM=262144" > > Then it would report the above error on bootup, just after reporting > kernel bus options. > > Now, the problem only went away after removing a megabyte of ram. When I > changed it to: > options "MAXMEM=261120" > > ..it works fine. > You can also remove the bounce-buffers define. Those aren't usually needed with new technology hardware. The problem is that the kernel takes so much space, that there isn't room <16MB for bounce buffers. Unless we get lots of users with > 128M using ISA SCSI adaptors, I don't think that it is worth fixing the memory allocation code, until we create physical memory type attributes. John
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