Re: [lwip-devel] Constraining pbuf pools location by the linker

[Claudius Zingerli]

Hi Bastien,

On 2014-03-20 16:26, Bastien Allibert wrote:
[STM32F4 zero copy]
> The problem is : in STM32F4 chip, not all of the memory can be accessed
> by the ethernet DMA. So, if i want to compute my DMA descriptors

Do you mean CCM? The rest should be accessible from the DMA.
Do you really need zero copy? I was working on an implementation for the 
same MCU, but despite the elegance, it increased the code complexity 
quite a bit (More dynamic mem allocations, buffer collector, error 
handling). Your MCU should be capable of giving you almost line speed 
(100Mbps Ethernet) while still idling most of the time. Been there, done 
that and finally disabled ZC again :(

Let me know about your ZC experiences.

Claudius