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

[Kevin O'Connor]

On Tue, Dec 29, 2009 at 01:51:36PM -0800, 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.
> 
> There is no vm state associated with the debugging port, simply
> because it has none -- the entire interface is a single, stateless,
> write-only port.
> 
> Most of the code was cribbed from the serial port driver.

Hi,

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?

-Kevin