John Linn wrote:
I searched the archives and the docs and didn’t see anything specific to fragmentation. I’m developing an LL TEMAC driver for u-boot on Xilinx boards and am seeing an issue.
If the TFTP server providing the kernel image is not fragmenting packets, I can transfer a kernel image fine. But if the TFTP server fragments packets I see problems. I’m sure it’s a problem with my new driver, but wanted to make sure there’s not any known issues with u-boot in this area.
Thanks, John
The code says "no."
if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */ return;
That's too bad, bigger packets can help substantially with throughput on TFTP (throughput is hammered by latency with TFTP). Something to think about... doing simple reassembly (only handle in-sequence reassembly) is fairly simple.
Best regards, gvb