Re: Trouble with SCC UART ports when moving from ppc to powerpc

[Laurent Pinchart <laurentp@cse-semaphore.com>]

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Hi Scott,

On Monday 17 March 2008 16:33, Scott Wood wrote:
> On Mon, Mar 10, 2008 at 01:17:01PM +0100, Laurent Pinchart wrote:
> > On Friday 07 March 2008 17:21, Scott Wood wrote:
> > > cpm2_reset() doesn't currently actually reset the CPM, for some reason
> > > (unlike cpm1).  This should probably be fixed, though then we'd have to
> > > deal with assigning SMC parameter RAM addresses ourselves.
> >
> > I had overlooked that. Resetting the CPM in cpm2_reset() helps. Is there
> > any reason not to rset the CPM in cpm2_reset() ?
>
> The only issue I'm aware of other than the SMC parameter RAM relocation is
> that the reset can't happen if the early udbg printk is being used.
>
> > How should SMC parameter RAM assignment be handled ? I'm not very
> > familiar with the CPM1,
>
> CPM1 has hardcoded SMC parameter RAM addresses, so it's not relevant here.
>
> > but for CPM2 the cpm_uart driver could easily cpm_dpalloc() parameter
> > RAM.
>
> It can, yes.  Patches welcome. :-)

I'm working on a patch. I'm not sure how to handle the early udbg printk 
problem, so the first version will just ignore it.

Best regards,

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussée de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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