Re: [lwip-devel] again... Zero Copy Ethernet interface

[Alain M.]

I believe that what he wants is to use a processor (like some ARMs) that 
have DMA only in a certain address range reserved for ethernet, but it 
is not too small. The problem might be that a normal malloc is not in 
that address range, so a special pbuff alloc is all that is needed...

Alain

bill escreveu:
> You’d have to have more than one, sure.  You might be able to ping-pong 
> between 2 – but without copying you stand to lose packets if you don’t 
> finish with the first and the second one has come in and then a third is 
> pending.
>
> Bill
>
> i suppose i could have a driver with more than one pbuf allocated... it 
> could be more efficient... but, my problem, is the pbuf allocation memory:
>
> DMA MUST works in FIXED region in memory, and instead i have no control 
> where pbuf payload are allocated... do you have a solution?