linux-mips
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Re: XZ graphics specs...

To: Ralf Baechle <ralf@oss.sgi.com>
Subject: Re: XZ graphics specs...
From: "William J. Earl" <wje@cthulhu.engr.sgi.com>
Date: Fri, 14 Jan 2000 21:28:02 -0800 (PST)
Cc: "Soren S. Jorvang" <soren@wheel.dk>, John Michael Clemens <clemej@rpi.edu>, linux@cthulhu.engr.sgi.com
In-reply-to: <20000114114430.A4278@uni-koblenz.de>
References: <14462.24718.670816.841437@liveoak.engr.sgi.com> <Pine.A41.3.96.1000113224501.118018F-100000@vcmr-19.rcs.rpi.edu> <20000114055613.A26954@gnyf.wheel.dk> <20000114114430.A4278@uni-koblenz.de>
Sender: owner-linuxmips@oss.sgi.com
Ralf Baechle writes:
 > On Fri, Jan 14, 2000 at 05:56:13AM +0100, Soren S. Jorvang wrote:
 > 
 > > On Thu, Jan 13, 2000 at 10:56:25PM -0500, John Michael Clemens wrote:
 > > > Would there be enough in this firmware to do a basic text console?  even
 > > > that would be better than soldering together a serial cable to run over
 > > > Minicom.
 > > 
 > > You can always use the PROM callbacks for that.
 > 
 > In theory yes.  In practice all firmware that I've seen so far seems to
 > be rather fragile and for some systems also very performance limited as
 > it's running from uncached memory (veeeerry slooow) or at times even
 > from 8-bit wide PROMs which is so slow that it blows every meassure for
 > slowness.  Not to mention other problems.  So this should really be
 > considered a better than nothing solution.
 > 
 > That being said, Ulf Carlsson has implemented a PROM console which is
 > in the CVS archive.  Try it, I'm interested in reports.

      On some platforms the PROM code is actually copied to main memory
and executed (cached) from there.  If I remember correctly, O2 works that
way.  Indy is probably in the slow (possibly very slow) category.

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