patch - at91 serial drivers assumed realtime response for DSR routines

[Jani Monoses]

> > 
> > My observation is that the EB40A has no problem keeping up with even
> > the highest baud rate. However, this board uses an AT91R40008 which
> > has 256k of on-chip SRAM.
> 
> I've got an EB40a, and I've never gotten it to work >38400, even when
> I'm running everything from onchipo SRAM.

Me too, I only have SRAM on my target and only with this patch could I
go over 38K.

> as a whole. Also, once this has been done, the existing serial ISR
> > code would work without using the PDC.
> 
> Thats one *big* patch.
> 
> It would be a shame to ditch a partial intermediate solution to the
> problem, in anticipation of a complete and correct solution that may
> take a long time to materialise. 

I agree here as well.

Jani