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

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
>
>
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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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ATM driver for 8260 (linux 2.4.x) working!

[None Atall]

 At last,
The import to 8260 was successfull!
For now I support AAL5, and CBR. It is
a matter of days before I have a full working
driver. The only problem is the cache problem,
since I want uncashed pages. I am still working
on it.
 If anyone needs the driver really fast, I can send
it to him.

               A happy Hardware engineer,that
               messed with software engineering! :)
                        D. Meidanis


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