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From: roberto@keltia.freenix.fr (Ollivier Robert)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: 128MB Ram
Date: 1 Jan 1996 18:12:37 GMT
Organization: Usenet Canal Historique
Lines: 38
Message-ID: <4c986l$4p3@keltia.freenix.fr>
References: <4bv73t$faa@sundog.tiac.net>
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In article <4bv73t$faa@sundog.tiac.net>,
Pete Davis <pete@millenium.tiac.net> wrote:
>
> Does anybody know if there is a real way to make a machine recognize 128MB
> of ram? It appears that my kernel only recognizes 64MB. Is there anyway
> to do this without hacking? If I need to hack it, what is the best
> way to go about doing so?
The answer is in the FAQ:
8.6. I have 128 MB of RAM but it seems that the system use only the
first 64 MB. What's going on ?
Due to the manner in which FreeBSD gets the memory size from the BIOS,
it can only detect 16 bits worth of Kbytes in size (65535 Kbytes =
64MB). If you have more than 64MB, FreeBSD will only see the first
64MB. To work around this problem, you need to use the kernel option
specified below. There is a way to get complete memory information
from the BIOS, but we don't have room in the bootblocks to do it.
Someday when lack of room in the bootblocks is fixed, we'll use the
extended BIOS functions to get the full memory information...but for
now we're stuck with the kernel option.
______________________________________________________________________
options "MAXMEM=<n>"
______________________________________________________________________
Where n is your memory in Kilobytes. For a 128 MB machine, you'd want
to use 131072
[ cc'ed to Pete ]
FreeBSD FAQ: <URL:http://www.freebsd.org/How/faq/>
--
Ollivier ROBERT -=- FreeBSD: The daemon is FREE! -=- roberto@freebsd.org
-=-=-=-=-=-=-=-=-=-=- FreeBSD 2.x FAQ maintainer -=-=-=-=-=-=-=-=-=-=-=-=-