Path: utzoo!utgpu!watmath!clyde!att!rutgers!ucsd!ucbvax!hplabs!hpda!hpcuhb!hpindda!huilin
From: huilin@hpindda.HP.COM (Hui Lin Lim)
Newsgroups: comp.os.minix
Subject: Re: RAM disk in extd memory (IBM)
Message-ID: <3580017@hpindda.HP.COM>
Date: 4 Jan 89 20:56:02 GMT
References: <3580016@hpindda.HP.COM>
Organization: HP Information Networks, Cupertino, CA
Lines: 22

>ast@cs.vu.nl (Andy Tanenbaum) writes: 
>In article <3580016@hpindda.HP.COM> huilin@hpindda.HP.COM (Hui Lin Lim) writes:
>>Has anyone considered putting the RAM disk into extended memory
>>when MINIX is run on 386 systems?  I'm new to MINIX having just
>>bought the book and software (v1.2) but haven't seen any
>>discussion about this so far.
>
>In 1.3, the root file system can be put in extended memory on a 286.
>I don't actually know how that works on a 386.  The extended memory is
>driven by a routine in klib88.s, so if 386 extended memory has to be
>accessed differently, that routine will have to be changed.  Has anyone
>used extended memory on a 386?

I believe that the 286 version of software should work but a
version written specifically for the 386 should be much more
efficient since the 386 does not have to reset when switching
from protected to real mode.  Please note that I am speaking NOT
from experience but just from what I know of the 386.  (I'm also
assuming that MINIX normally runs in the real mode on 286/386
systems.

Hui Lin Lim