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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 12:15:12 EDT."
             <199605081615.MAA29034@etinc.com> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Wed, 08 May 1996 09:55:21 -0700
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>>>
>>>When we set the 15-16Meg ISA hole (which creates an addition area
>>>for ISA adapters in the 15-16Meg region) in a 32Meg System, FreeBSD
>>>only sees 15Meg in the Box. When the ISA hole is removed, it sees all
>>>32Meg.
>>>
>>>How do I tell the O/S that this hole is there so it sees the other 16Meg?
>>
>>   You don't. We don't have support for arbitrary holes in the address space.
>>
>
>If you set the adapter address in the kernel config to:
>
>iomem 0xF00000 iosiz 0x100000
>
>
>would this work?

   No. Except for the standard ISA hole, FreeBSD doesn't know how to handle
other arbitrary holes in the address space. It would be not be very difficult
to special-case the 1MB region in the 15-16MB area, but this support isn't
there currently.

-DG

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