Re: [lwip-devel] Issue with Cortex Emac driver

[Daniel Gutson]

El 16/2/2016 8:25, "Freddie Chopin" <address@hidden> escribió:
>
> On czw, 2015-11-05 at 10:19 -0700, RAc wrote:
> > Thanks Ivan,
> >
> > I've encountered this with both the ST32 and NXP LPC1830 drivers. The
> > NXP
> > driver also has other (known) problems, eg it relies on pbuf_alloc()
> > to
> > return buffers that are aligned according to the DMA requirements.
>
> Hello!
>
> This is a very important topic! I think that I've encountered this
> issue on LPC1768 a few years ago -

FWIW, we did the BSP for the LPC1768 for RTEMS which included a port of LwIP for such RTOS, and it does not suffer from such symptom (which we did experience in mbedOS).
Feel free to ask for details of this if it is of interest.

after some uptime (like a day) the
> network on the device really started to "lag" and become really slow.
> The issue could also be triggered pretty quick by pausing the chip with
> debugger - after a few pauses the same thing happened. I think this can
> cause the pointers to come out of sync.
>
> Anyway - did you encounter any EMAC driver (for any chip type) that
> doesn't have that issue? I'll be starting a new project on STM32F4
> really soon and this issue will probably affect me. The device that
> I'll be working on will have really long uptimes (months) and source
> code provided by ST are usually pretty bad, so I don't have high hopes
> for their EMAC driver... Knowing any "good" driver I could use it as a
> reference to fix/implement a proper EMAC driver for STM32F4.
>
> Thanks for any help!
>
> Regards,
> FCh
>
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