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

[Trueskew]

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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