From owner-freebsd-hackers  Sun Mar 14 11:21:41 1999
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Date: Sun, 14 Mar 1999 13:20:44 -0600 (CST)
From: Jonathan Lemon <jlemon@americantv.com>
Message-Id: <199903141920.NAA16212@free.pcs>
To: tony@dell.com, freebsd-hackers@freebsd.org
Subject: Re: Proposal: Define MAXMEM in GENERIC 
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In-Reply-To: <local.mail.freebsd-hackers/3.0.6.32.19990314123925.039187c0@bugs.us.dell.com>
References: <local.mail.freebsd-hackers/Your message of "Mon, 15 Mar 1999
	01:54:46 +0900."
	<local.mail.freebsd-hackers/36EBE9D6.7E6320FE@newsguy.com>
	<local.mail.freebsd-hackers/63209.921431112@axl.noc.iafrica.com>
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In article <local.mail.freebsd-hackers/3.0.6.32.19990314123925.039187c0@bugs.us.dell.com> you write:
>>... since we're
>>likely to see more and more people having problems related to failed
>>speculative memory probes as >64MB machines become entry-level.
>
>Since all(*) new machines support INT 15h AX=E820h, and FreeBSD now 
>seems to be able to use it, why not have the speculative probe 
>default to disabled in GENERIC and use a boot option to enable probing 
>support for those very few older systems that supported more than 64MB 
>or 16MB but did _not_ yet support E820h (or E801h)?
>
>(*) Good bet if the machine supports MS-Windows.
>
>p.s.  FreeBSD seems to prefer E801h over E820h.  I'd like to see it 
>      the other way around, since you could gain almost 64 KB of 
>      extra memory in some cases.

Not true, if you're referring to the VM86 memory probe.  It tries
INT 15h, AX=E820, then INT 15h, AX=E801, then INT 15h, AX=88, in 
that order.

How about making VM86 a mandatory option?
--
Jonathan


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