[Qemu-devel] Re: [PATCH] debugcon: support for debugging consoles (e.g.Bochs port 0xe9)

["H. Peter Anvin" <hpa@linux.intel.com>]

Sebastian Herbszt wrote:
> H. Peter Anvin wrote:
>> Add generic support for debugging consoles (simple I/O ports which
>> when written to cause debugging output to be written to a target.)
>> The current implementation matches Bochs' port 0xe9, allowing the same
>> debugging code to be used for both Bochs and Qemu.
> 
> Your implementation seems to miss the read part, unless you don't want 
> to be
> compatible with Bochs. user.dbk says:
> "Reading from port 0xE9 will will return 0xe9 to let you know if the 
> feature is available."
> 

I had actually missed that part... it seems somewhat pointless to me, 
but if that's the way Bochs does it it probably would indeed be better 
to be compatible.

	-hpa