pc386 serial port driver for more than two ports

[Joel Sherrill <joel@OARcorp.com>]

Peter Dufault wrote:
> I need support for four com ports.  I didn't find any existing work.
> 
> I'm modifying libbsp/i386/shared/comm/* now, if there is support that I 
> overlooked someone let me know.

I thought I remembered mention of using COM3 or COM4 in the past but I
sure don't see anything like that in the code.  It shouldn't take
much beyond careful cut and paste and interrupt connection to make
it work though.

Submit a PR with a patch if you add it.

> Peter
> 
> Peter Dufault
> HD Associates, Inc.
> 


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