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Re: [Qemu-devel] [PATCH] debugcon: support for debugging consoles (e.g.
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From: |
Kevin O'Connor |
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Subject: |
Re: [Qemu-devel] [PATCH] debugcon: support for debugging consoles (e.g. Bochs port 0xe9) |
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Date: |
Sat, 2 Jan 2010 12:53:54 -0500 |
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User-agent: |
Mutt/1.5.19 (2009-01-05) |
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