>I'm sure this subject has been covered before, but I ignored it because I
>only has 16MB RAM.  Now that I've upgraded to 32MB, this error is halting
>processes at random and it's getting extremely annoying.  Isn't the
>bounce-buffer strategy in isadma.c (or something like that) supposed to
>prevent this problem?

The code in isadma.c is for the motherboard DMA controllers.  It does
not have anything to do with bus-master controllers.

I don't mean to sound harsh, but have you been living in a cave?  This
has only been beat to death on the NetBSD lists over the last two
months or so (and is beat in such a fashion about every six months or
so).  And it's well-documented in many different places.

>If it's not enabled by default, how do I configure
>it?  If there is no fix, can I at least restrict netbsd to using just 16MB
>RAM (without physically taking the additional memory out)?

If this is 1.2, put "options EXTMEM_SIZE=15*1024" (I believe this is
in KiloBytes, correct?) in your kernel config file and build a new
kernel.  This will limit you to 640K base mem + 15MB extended mem.

-----------------------------------------------------------------------------
  Michael L. VanLoon                           michaelv@MindBender.serv.net
        --<  Free your mind and your machine -- NetBSD free un*x  >--
    NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
        Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
    NetBSD ports in progress: PICA, others...
-----------------------------------------------------------------------------