linux-kernel - Re: [PATCH 2/3] [ARM] msm: make debugging UART (for DEBUG

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Message-ID: <20090615185008.GC10490@elf.ucw.cz>
Date:	Mon, 15 Jun 2009 20:50:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	Brian Swetland <swetland@...gle.com>
Cc:	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] [ARM] msm: make debugging UART (for DEBUG_LL)
	configurable

On Mon 2009-06-15 11:43:23, Brian Swetland wrote:
> On Mon, Jun 15, 2009 at 11:34 AM, Pavel Machek<pavel@....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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