Using bestcomm in an external module (MPC5200B to be exact)

[John Rigby]

The next LTIB bsp for 5200b will use the Sylvain's bestcomm api.

On 6/19/06, Trueskew <trueskew at gmail.com> wrote:
> Hi Andrey,
>
> Thanks for the reply.  I did notice that a few weeks ago and was waiting for
> the patch state to be changed from "New" to "Accepted".  Can you give me
> more details on how you found out bestcomm won't be included in 2.6?  The
> latest downloadable LTIB from Freescale for the Lite5200b includes bestcomm
> in several places, and the mpc52xx fec driver uses it, along with the ATA
> driver that Sylvain provided a patch for.
>
> As for http://www.246tNt.com/mpc52xx/, it's been coming up "page not found"
> for me for those same few weeks when I've tried it off an on, and
> www.246tNt.com just has a Welcome line in it.
>
> Sal
>
> -----Original Message-----
> From: Andrey Volkov [mailto:avolkov at varma-el.com]
> Sent: Monday, June 19, 2006 6:15 AM
> To: Trueskew
> Cc: linuxppc-embedded at ozlabs.org
> Subject: Re: Using bestcomm in an external module (MPC5200B to be exact)
>
> Trueskew wrote:
> > I should've let you all know, I'm more of a 2.4 person than a 2.6 person.
> > So I read what I could on 2.6 difference with 2.4, and it looked like
> > my easiest choice was to modify the bestcomm code to export a couple
> > tables and its API functions.  I found that kallsyms has almost all of
> > the functions I needed to resolve (with 'T' next to them), but they were
> still not working.
> > I added EXPORT_MODULE(TaskBDReset) and similar declarations in the
> > bestcomm api code, but that still didn't do the trick for me.  So what is
> the trick?
> > I think I'm on the right track, I can insmod a module that my driver
> > needs, see kallsyms get updated, and access the functions directly in
> > my driver.  I hope I'm close to doing something similar with the
> > bestcomm functions, can anyone offer me some advice on what else I need to
> do?
> >
> > Thanks.
> Please, check Sylvain's patchset (http://www.246tNt.com/mpc52xx/) _before_
> you will do anithing. If be more shortly - Freescale's BestcommAPI
> _deprecated_ and will _not_ included to 2.6.xxx.
>
> --
> Regards
> Andrey Volkov
>
>
> >
> > ________________________________
> >
> > From: Trueskew [mailto:trueskew at gmail.com]
> > Sent: Friday, June 16, 2006 9:47 PM
> > To: 'linuxppc-embedded at ozlabs.org'
> > Subject: Using bestcomm in an external module (MPC5200B to be exact)
> >
> >
> > I'm writing a driver for a TI codec attached to the MPC5200B PSC3
> > codec lines on a Lite5200b.  It's an external module, and I'd like to
> > use Bestcomm with it.  I've already tried a bunch of horrible things to
> get it to work.
> > I could say it's close, but by close I mean the FEC still runs, my
> > stuff doesn't.
> >
> > 1. Can the Bestcomm I/F be used by an external module, or is the
> > module required to be built in if built-in drivers use Bestcomm?
> > TasksInitAPI (no so bad) and TasksLoadImage (yeah, bad) aren't really
> > supposed to be called more than once from what I've read, and the
> > kernel loads them for ethernet and ATA (no disk in my system if that
> matters).
> >
> > 2. If it can be used by an external module, how would I do it?  I've
> > tried compiling the source into my module and replicating the
> > initialization the kernel does in addition to my own stuff.  It's not
> > too bad, though I don't get any interrupts yet.
> >
> > The LTIB from Freescale includes AIC23 and AC97 drivers that use Bestcomm.
> > I built my kernel with them set as modules, and they had the same
> > unresolved problems that my driver has on insmod, so I'm pessimistic.
> > If someone could put me out of my misery one way or another, I'd
> appreciate it.
> >
> > Thanks.
> > Sal
> >
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>
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