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Date: Wed, 25 Nov 2009 13:46:11 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] debugcon: support for debugging consoles
	(e.g.	Bochs port 0xe9)
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To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>, qemu-devel@nongnu.org

On 11/25/09 00:05, H. Peter Anvin wrote:
> On 11/23/2009 12:11 PM, H. Peter Anvin wrote:
>> On 11/23/2009 02:52 AM, Gerd Hoffmann wrote:
>>>
>>> All not needed.  Simply registering as qdev device is enougth.  You can
>>> then add a debug port like this, without adding new cmd line options:
>>>
>>>     -chardev vc,id=debug -device isa-debugcon,chardev=debug
>>>
>>> Adding a second one on a non-default port works this way:
>>>
>>>     -chardev vc,id=d2 -device isa-debugcon,iobase=0xea,chardev=d2
>>>
>>
>> Sure, but is that user friendly?
>>
>
> Question still stands... if this is The Way It Is Done, then I'll do it
> that way, but I will personally never be able to remember to type the
> above stuff without looking it up every time, whereas "-debugcon stdio"
> is something I can remember in my sleep.

You can stick it into a config file[1] like this:

[chardev "debuglog"]
   backend = "file"
   path = "/path/to/debug.log"

[device]
   driver = "isa-debugcon"
   chardev = "debuglog"

Then use "qemu -readconfig $file".

cheers,
   Gerd

[1] Well, almost, fix to make this actually work went to the list today.