[U-Boot] [PATCH 1/2] Serial support extended up to 6 COMs

[Detlev Zundel <dzu@denx.de>]

Hi Michael,

> Added support for extra ns16550 chip extending total number of
> supported COMs up to 6. This targets the cases when due to the
> insufficient number of UART ports on the CPU chip designers are
> forced to put additional ns16550 chip on board.

Additionally to Wolfgangs comments, let me make a few observations here.
In a different project I also thought on how to implement functionality
compared to what you try to achieve and in the end I got the impression
that this is a very good chance to introduce a real device model into
U-Boot.  We have been thinking about this for a long time[1] but nobody
came around hacking on it yet.  If you check the BOF page, you can see
that this will also open up a way to do a dynamic driver configuration,
e.g. by device tree.  This is one direction we really need to cover
somehow - sooner or later.

What do you think - do you want to go the extra distance?

For a transitional time, I think we can also live with two serial driver
implementatinos - after all, we have 5 "mpsc.c" files in the tree
currently, so every chance for a cleanup is welcome :)

Cheers
  Detlev

[1] http://www.denx.de/wiki/view/U-Boot/OLSUbootBOF

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