Cache issue with BBB networking

[Marcos Díaz]

I have a question about this, the frebsd driver, was prepared to be used
with cache enabled?
I mean, in freeBSD OS the cache is enabled?

On Tue, Jun 30, 2015 at 12:46 AM, Daniel Gutson <
daniel.gutson at tallertechnologies.com> wrote:

> Ragu,
>
>    Please ensure that you are getting cache coherence right. That is,
> there are no packets crossing the cache lines.
> FWIW, in a life ago, i got a problem with an eth driver where the
> descriptors ring was not properly sized (ie no modulus cache line).
> El 29/6/2015 17:23, "ragu nath" <ragunath3252 at gmail.com> escribió:
>
>> Thanks Marcos. I will let you know if there is any progress.
>>
>> Regards,
>> Ragunath
>>
>> On Tue, Jun 30, 2015 at 12:50 AM, Marcos Díaz <
>> marcos.diaz at tallertechnologies.com> wrote:
>>
>>> Hi,
>>> I'm sorry but in the development of the porting of LWIP i couldn't give
>>> any more time to the task, so when I reached that stage I just disabled the
>>> cache.
>>> I will try to give some time to that to see if i can help you, and of
>>> course, let me know if you find something.
>>> Sorry again
>>>
>>> On Mon, Jun 29, 2015 at 3:16 PM, ragu nath <ragunath3252 at gmail.com>
>>> wrote:
>>>
>>>> Hi Marcos,
>>>>
>>>> I am working on porting ethernet driver for Beaglebone black from
>>>> FreeBSD to rtems-libbsd as part of GSOC 2015. I ported the driver and
>>>> got it working.
>>>>
>>>> But there was one issue I faced, similar to the one you mentioned in
>>>> our earlier correspondence (regarding lwIP). You mentioned that the
>>>> system crashes if cache is enabled.
>>>>
>>>> In my case, the Address Lookup Engine (ALE) is getting corrupted if
>>>> cache is enabled. Because of this packet transmission failed sending
>>>> out random junk packets. With cache disabled, networking is working.
>>>>
>>>> I am looking for options other than disabling cache as a whole. Is
>>>> there any other option available?  Can you share the details of any of
>>>> the things you tried and found not working?
>>>>
>>>>
>>>> Thanks,
>>>> Ragunath
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> ______________________________
>>>
>>> <http://www.tallertechnologies.com>
>>>
>>>
>>> Marcos Díaz
>>>
>>> Software Engineer
>>>
>>>
>>> San Lorenzo 47, 3rd Floor, Office 5
>>>
>>> Córdoba, Argentina
>>>
>>>
>>> Phone: +54 351 4217888 / +54 351 4218211/ +54 351 7617452
>>>
>>> Skype: markdiaz22
>>>
>>>
>>
>>
>> --
>> ragu
>>
>


-- 

______________________________

<http://www.tallertechnologies.com>


Marcos Díaz

Software Engineer


San Lorenzo 47, 3rd Floor, Office 5

Córdoba, Argentina


Phone: +54 351 4217888 / +54 351 4218211/ +54 351 7617452

Skype: markdiaz22
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