Date: Wed, 31 Jan 1996 19:09:02 +73700 (MST) From: Terry Lambert <terry@lambert.org> To: m_tanaka@pa.yokogawa.co.jp (Mihoko Tanaka) Cc: terry@lambert.org, jerry@border.com, freebsd-hackers@FreeBSD.org Subject: Re: Compaq 16MB limit... Message-ID: <199602010209.TAA11652@phaeton.artisoft.com> In-Reply-To: <9602010134.AA10287@cabbage.pa.yokogawa.co.jp> from "Mihoko Tanaka" at Feb 1, 96 10:34:49 am
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> >>There is no documented API to return the amount of RAM in a machine > >>other than CMOS. There is no BIOS routine that can be used by the > >>boot blocks to overcome this limit, nor does the POST place the results > >>of its test or expose a ROM routine for sizing memory. > > I asked a engineer of COMPAQ about it last month. > He said that we can use the following BIOS call for getting the > amount of RAM in a machine. [ ... Compaq BIOS call that probably won't work in protected mode ... ] > BSD/OS fixes it by testing for memory (starting at 2MB, and > continuing at most to 2GB) in the boot program, or by allowing you > to use a configuration file. We used to test for memory too. It made some computers reboot when you accessed bad pysical memory locations. Notably, Compaq. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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