Re: [lwip-users] byte alignment

[Tyrel Newton]

> It might help some of us to help you if you can tell us about the system
> you're using.  Unless this is a custom processor, someone here has probably
> used what you're using and can tell you what is best to do.  If your MAC has
> some facility to read in a packet with a +2 offset (it's still 32-bit
> aligned - they just prefix 0's to the frame) then you can receive a frame on
> a 32-bit boundary and the actual packet is at offset +2, which makes all of
> the headers 32-bit aligned when ETH_PADSIZE is 2.
>    

I doubt it will help that much because I'm using the xps_ethernetlite IP 
core with a MicroBlaze embedded processor on a Spartan-3A DSP. Most 
people that are using this type of setup don't care about making it 
actually work well, they seem to be happy using the sub-standard 
software provided by Xilinx. The xps_ethernetlite core is a 100Mbps mac 
without DMA. Xilinx also offers a gigabit mac with DMA, which quite 
naturally consumes many more FPGA resources (and costs more). The 
problem I'm seeing is that the xps_ethernetlite core is unnecessarily 
limited by this alignment issue.

Tyrel