From owner-freebsd-hackers  Wed May  8 10:22:41 1996
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To: dennis@etinc.com (dennis)
cc: hackers@freebsd.org
Subject: Re: ISA Hole - Memory Problem 
In-reply-to: Your message of "Wed, 08 May 1996 13:17:00 EDT."
             <199605081717.NAA29184@etinc.com> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Wed, 08 May 1996 10:22:30 -0700
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>If  you could point me at the right modules/routines I'd like to take a look
>at it. 
>The 15-16Meg region is a fairly common option in many motherboard (I think
>its generally called the "Compaq Hole") and it makes life a lot easier if
>you have
>a bunch of shared-memory cards in the same box....particularly if you want to 
>run X and can't use A0000.

   Look in machdep.c in middle of the routine init386(). You'll find the
memory sizer there. You'll need to mess with the phys_avail array so that
a hole is created. phys_avail is an array of start-end ranges of good memory.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project