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From: gab10@griffincd.amdahl.com (Gary A Browning)
Newsgroups: comp.unix.bsd
Subject: Re: [386BSD] more than 16MB?
Message-ID: <d6.m02B=30=s01@JUTS.ccc.amdahl.com>
Date: 7 Jan 93 16:06:51 GMT
References: <C0EHx0.qr@space.physics.uiowa.edu> <1if0p8INNfau@Germany.EU.net>
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In article <1if0p8INNfau@Germany.EU.net>, bs@Germany.EU.net (Bernard
Steiner) writes:
> In article <C0EHx0.qr@space.physics.uiowa.edu>,
> ljg@space.physics.uiowa.edu (Larry Granroth) writes:
> > Is anyone out there running 386bsd on an ISA-bus machine with more
> than
> > 16MB ram?
>
> Yes. I've seen a machine with 20MB and heard of one with 64 MB
> (yes, sixty-four) No, not me...
>
> > Does 386bsd support this?
>
> Looks like it.
>
> > Does it (does it need to?) support
> > DMA above 16MB?
>
> No idea. I'd be interested in the answer, though.
If I understood the thread that went through here a while back, ISA systems
cannot do DMA above 16MB - hardware problem. 386BSD needed to be modified to
load disk buffers below 16MB and then copy them up if necessary. I do not
know if anyone has attempt to add this to the kernel.
--
Gary Browning | Exhilaration is that feeling you get just after a
| great idea hits you, and just before you realize
| what is wrong with it.