From: Kevin O'Connor <kevin@koconnor.net>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] debugcon: support for debugging consoles (e.g. Bochs port 0xe9)
Date: Sat, 2 Jan 2010 12:53:54 -0500 [thread overview]
Message-ID: <20100102175354.GA17268@morn.localdomain> (raw)
In-Reply-To: <4B3EB763.4030000@zytor.com>
On Fri, Jan 01, 2010 at 07:02:59PM -0800, H. Peter Anvin wrote:
> On 12/30/2009 08:49 AM, Kevin O'Connor wrote:
> > SeaBIOS writes debugging info to port 0x0402. Unfortunately, qemu has
> > to be recompiled in order to display this info. Will your patch
> > enable one to get at the 0x0402 data without recompiling?
>
> Incidentally, it's somewhat unusual choice of ports... port 0x80 is the
> normal port for BIOSes to display debugging information on.
Port 0x0402 is a carry over from Bochs bios.
Port 0x80 isn't generally used to emit a stream of ascii data, and it
can be used by other programs besides the bios. I'd guess that's why
Bochs chose a different port.
-Kevin
next prev parent reply other threads:[~2010-01-02 17:54 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1262123496-12007-1-git-send-email-hpa@linux.intel.com>
[not found] ` <20091230164946.GA9858@morn.localdomain>
2010-01-02 3:01 ` [Qemu-devel] [PATCH] debugcon: support for debugging consoles (e.g. Bochs port 0xe9) H. Peter Anvin
2010-01-02 3:02 ` H. Peter Anvin
2010-01-02 17:53 ` Kevin O'Connor [this message]
2010-01-02 18:56 ` H. Peter Anvin
2010-01-03 2:13 ` François Revol
2010-01-04 14:13 ` [Qemu-devel] " Gerd Hoffmann
2010-01-08 16:36 ` [Qemu-devel] " Anthony Liguori
2009-12-03 5:04 H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2009-12-03 3:11 H. Peter Anvin
2009-12-03 4:02 ` malc
2009-11-20 21:33 H. Peter Anvin
2009-11-23 10:52 ` Gerd Hoffmann
2009-11-23 20:11 ` H. Peter Anvin
2009-11-24 23:05 ` H. Peter Anvin
2009-11-25 7:33 ` Alexander Graf
2009-11-25 12:46 ` Gerd Hoffmann
2009-11-25 18:01 ` H. Peter Anvin
2009-11-25 22:21 ` Gerd Hoffmann
2009-11-25 22:26 ` H. Peter Anvin
2009-11-25 22:31 ` H. Peter Anvin
2009-11-25 22:54 ` Gerd Hoffmann
2009-11-26 9:56 ` Markus Armbruster
2009-11-25 22:53 ` H. Peter Anvin
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