Cache issue with BBB networking

[ragu nath]

Hi Marcos,

As far as I know, cache is enabled in Freebsd.

Thanks,
Ragunath

On Tue, Jun 30, 2015 at 7:14 PM, Marcos Díaz <
marcos.diaz at tallertechnologies.com> wrote:

> 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
>
>


-- 
ragu
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