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Re: 32-bit ABI

To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Subject: Re: 32-bit ABI
From: Ralf Baechle <ralf@linux-mips.org>
Date: Sat, 24 Apr 2004 10:26:55 +0200
Cc: Stanislaw Skowronek <sskowron@ET.PUT.Poznan.PL>, linux-mips@linux-mips.org
In-reply-to: <Pine.LNX.4.55.0404241021140.14494@jurand.ds.pg.gda.pl>
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References: <Pine.GSO.4.10.10404240945500.14182-100000@helios.et.put.poznan.pl> <Pine.LNX.4.55.0404240949350.14494@jurand.ds.pg.gda.pl> <20040424075545.GA27039@linux-mips.org> <Pine.LNX.4.55.0404240959200.14494@jurand.ds.pg.gda.pl> <20040424081854.GB26165@linux-mips.org> <Pine.LNX.4.55.0404241021140.14494@jurand.ds.pg.gda.pl>
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On Sat, Apr 24, 2004 at 10:23:34AM +0200, Maciej W. Rozycki wrote:

> > Actually the R10000 way to do something like this is to use the uncached
> > attribute like in the Origin.  It allows using the same physical address
> > space several times for different purposes.  So on node 0 of an Origin
> > indeed memory starts at physical address zero and there is no hole for
> > the firmware.  IP27 is afaik the only system using this R10000 feature
> > which surprises me a little due to the otherwise great similarity of these
> > two systems.
> 
>  That precludes the firmware from being run cached, though.  Not very 
> nice, especially for callbacks, but perhaps a bit easier to deal with.

Sane firmware copies itself to RAM at the earliest possible stage anyway -
ROMs are way too slow.

  Ralf

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