ATM driver for 8260 (linux 2.4.x) + more questions

ATM driver for 8260 (linux 2.4.x) + more questions

[None Atall]

 By the way, as I can see from mpc860sar code, the
ATM device is connected on SCCx via utopia. Our board
(MPC8260ADS and our custom one) have the ATM connected
on FCC1. Will I need too many changes after the patch?
Can anyone evaluate the changes that i will need?
We are running out of time, so I wonder...

                                  Thanks a lot!
                                      D.Meidanis




=====
-------------------------------------------------
  Dhmhtrios Meidanis
-Degree in Mathematics, University of the Aegean.
-Master in Computer Architecture and Digital
 Systems, University of Crete.
  Greece.
-------------------------------------------------


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Re: ATM driver for 8260 (linux 2.4.x) + more questions

[Alex Zeffertt]

None Atall wrote:
>
>  By the way, as I can see from mpc860sar code, the
> ATM device is connected on SCCx via utopia. Our board
> (MPC8260ADS and our custom one) have the ATM connected
> on FCC1. Will I need too many changes after the patch?
> Can anyone evaluate the changes that i will need?
> We are running out of time, so I wonder...
>
>                                   Thanks a lot!
>                                       D.Meidanis
>


As I understand it there is no FCC1 on the 860.  This is something you get with the 8260 only.  With
the 860 you need to use the utopia interface.

I wrote the code for the 860 so there is no support for FCC ATM.  You'll have to read the 8260 UM to
work out how much there is to do.

Alex

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Re: ATM driver for 8260 (linux 2.4.x)

[None Atall]

 James, Is this patch for 8260 ATM ready? I am realy
looking forward!!

                 D. Meidanis

Great stuff seeking new owners in Yahoo! Auctions!
http://auctions.yahoo.com

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Re: [Linux-ATM-General] Re: ATM driver for 8260 (linux 2.4.x)

[James Campbell]

Hello,

Sorry for the long time getting back about the patch.

I have the patch ready to distribute, BUT I'm running into some
problems at work getting it released under the gpl.  As soon as
this happens, you'll see something from me.

I'm all for giving back to the community, and I think those here
will come arround rather soon, I hope.

Cheers,

James Campbell

On Thu, 2002-01-24 at 08:07, None Atall wrote:
>
>  James, Is this patch for 8260 ATM ready? I am realy
> looking forward!!
>
>                  D. Meidanis
>
>
> _______________________________________________
> Linux-atm-general mailing list
> Linux-atm-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-atm-general
>
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Re: [Linux-ATM-General] Re: ATM driver for 8260 (linux 2.4.x)

[None Atall]

 Mr Hofrat is right!
For some reason the interrupt handler reads old
values, although the CPM puts new data. (I checked it
using JTAG). It seems
like the old data are kept on buffers and are not
refreshed. Unfortunetely i did what Hofrat saied,
but it doesn't work. Is there a function for forcing
refresh? flush_tlb or flush_dcache perhaps?

                     Thanks!
                       D. Meidanis

--- Der Herr Hofrat <der.herr@mail.hofr.at> wrote:
> >
> >   But until you do it, could you help me in one
> > problem
> > that i have? I have imported the mpc860sar driver
> > myself. But i have this problem. When i use the
> aread
> > program, i seem to take the data ok. But if from
> the
> > transmit computer i send quick the data, the CPM
> seems
> > to
> > jump positions in the Interrupt Queue. I mean that
> my
> > pointer (SW) increases correct, but the CPM
> increases
> > without putting an interrupt entry. Any ideas?
> > Also, in the original driver Alex used the
> > mm_alloc_uncached_pages function, but i have
> replased
> > it with kmalloc(size, GFP_KERNEL). Is it correct?
> >
> I don't know about the details of your setup - but
> we had similar phenomenon with
> a driver on the CPM that acknowledged the interrupt
> too late - the therapy
> was to move the interrupt ack to the top of the
> driver and all was well.
>
> so maby you are seeing the same problem due to the
> same driver coding error .
>
> hofrat


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Re: [Linux-ATM-General] Re: ATM driver for 8260 (linux 2.4.x)

[Wolfgang Denk]

In message <20020129142321.38639.qmail@web9706.mail.yahoo.com> you wrote:
>
> For some reason the interrupt handler reads old
> values, although the CPM puts new data. (I checked it

Sounds like a cache problem...

> using JTAG). It seems
> like the old data are kept on buffers and are not
> refreshed. Unfortunetely i did what Hofrat saied,
> but it doesn't work. Is there a function for forcing
> refresh? flush_tlb or flush_dcache perhaps?

flush_dcache_range().

> > > Also, in the original driver Alex used the
> > > mm_alloc_uncached_pages function, but i have
> > replased
> > > it with kmalloc(size, GFP_KERNEL). Is it correct?

Hint! Hint!

Hope this helps,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
As far as we know, our computer has never had an undetected error.
		                                           -- Weisert

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Re: [Linux-ATM-General] Re: ATM driver for 8260 (linux 2.4.x)

[None Atall]

  It was realy cache problem! I had to disable
both caches I,D from the head.S to find that!
Well the receaver works ok with Dcache off....
As I looked from the mpc860sar code, there is a
way to tell linux not to cache specific pages.
But the functions are not compatible with 8260.
Does anyone know how to do that for 8260?

                    Thanks a lot for your time!
                        D. Meidanis


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