The if_at91.c driver sometime don't mark buffers from broken packets as free. And the sequential.c don't call the driver in every case. The two uploaded files correct this. Its not an patch because i use the files currently in my project and not in the ecos repository.
An other thing the lwIP from ecos is missing is the check if the kernel-mailbox-size is at least the size of the PBUF or INPKT buffer... The new version of the if_at91.c deliver-procedure tests all the buffers of the EMAC at once and search also for broken packets. There was also an error in the calculation of the packet-size if the packets where bigger then 128bytes.
if_at91.c
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sequential.c
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