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Re: Olli working, help?

To: linux-mips@fnet.fr
Subject: Re: Olli working, help?
From: Ralf Baechle <ralf@waldorf-gmbh.de>
Date: Wed, 25 Oct 1995 20:56:43 +0100 (MET)
In-reply-to: <9510251816.ZM1487@black.uni.net> from "Paolo Bevilacqua" at Oct 25, 95 06:16:28 pm
Hi,

> > Just a little question, how much RAM do you got, and *most* important,
> > with what kind of SIMM (single, double, ....) ? I tried last night to
> > downgrade to 16Mo from 32Mo (was trying to wrote RAM detection for
> > Milo, currently for the Oily it's hard coded at 8Mo in Milo :( ), and
> > I wasn't able to do it, there are very restrictive rules about SIMMs
> > layout for the Oily...
> 
> Stoned, the olly docs states that you can read the amount and type of 
> installed
> RAM at a certain location... i would bet that it works for Mags too ...

There is just one problem - some SIMM types return the same type code in
the register.  So you have to try if the RAM really exists by accessing it.
If you try to access non existing RAM you'll get a NMI exception which
transfers control to the boot ROM ...

   Ralf

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