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Re: XZ graphics specs...

To: Ralf Baechle <>
Subject: Re: XZ graphics specs...
From: "William J. Earl" <>
Date: Fri, 14 Jan 2000 21:28:02 -0800 (PST)
Cc: "Soren S. Jorvang" <>, John Michael Clemens <>,
In-reply-to: <>
References: <> <> <> <>
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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