[PATCH] Platform bus support

[Pierre Ossman]

Pierre Ossman wrote:
> 
> The problem is with the serial class, not the platform bus. So it should
> be extended to somehow confirm each device that's given to it. This is
> done today for the floppy block devices. We need to investigate if there
> is a reliable way to do this though.
> 

I figured out a way to detect present ports. Those that aren't available
will have type PORT_UNKNOWN. I've got a helper up and running, hopefully
I'll have time to integrate it tomorrow. But the platform and floppy
stuff should be good to go now, right?

Rgds
Pierre