Re: [PATCH 2/3] [ARM] msm: make debugging UART (for DEBUG_LL) configurable

Pavel Machek
2009-06-15T18:50:28Z

On Mon 2009-06-15 11:43:23, Brian Swetland wrote:
> On Mon, Jun 15, 2009 at 11:34 AM, Pavel Machek<pavel@ucw.cz> wrote:
> >> > ...and those that do, have it at fixed uart, no?
> >>
> >> Well, I'd like to support the SoC generally, not just Dream -- it's
> >> used in a bunch of different devices, and there's nothing that forces
> >> you to use UART3 everywhere (I certainly have seen some 7k hardware
> >> that uses UART1 as the debug serial port).
> >
> > Aha, ok, I guess that should go to the changelog. (Nice bonus would be
> > if it was automatically/correctly set up when user selects machine
> > type... Actually, how does that work if you support few boards with
> > same kernel...?)
>
> At this point a kernel for multiple boards with different DEBUG_LL
> uarts doesn't work correctly -- I'm not sure this could be done
> without making the debug macro code, etc, a lot messier (since it has
> to write to the physical uart address in early boot and I believe that
> happens before the machine type is determined, though maybe I'm
> wrong).

Ok, makes sense.
Pavel
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