AT91 serial driver

[Øyvind Harboe <oyvind dot harboe at zylin dot com>]

So far I've run my patch through stress tests(lots of serial
communication + a soft 16x5x implemented in a FPGA), and it seems to
work fine @ 38400. My primary concern is not to loose chars and not to
introduce too long a delay from a char arrives until my app sees it. 

I haven't tested or looked very carefully at the other two patches.

It doesn't matter to me whether my patch(reformulated existing work)
gets comitted or not, but I'll be sure to take whatever gets committed
for a spin to see if it performs well enough for my app.

Here is a thought: there is no way I can use eCos in its committed state
for my application, hence I've made moficiations that are part patches
that have not been committed(and they may never be) and part highly
application specific tweaks. This means that the eCos source code itself
is a second level of configuration, where ecos.ecc is the primary. 

IMHO, the most important thing right now, is not the exact form or final
details of the serial driver patch, but to converge our efforts such
that we can yet again share work and experiences.

The patch to choose to commit, would be the one that can most easily be
tweaked through .ecc options and source code changes into whatever each
of need.

Ãyvind