lwip tftp not working on imx8mm

[Tim Harvey]

Hi Jerome,

I've enabled LWIP on imx8mm_venice to see how it's doing and while
dhcp/dns/ping/wget appear to work great, tftp is broken.

Enabling LWIP_DEBUG shows the following:
ip4_input: packet accepted on interface et
IP packet dropped since it was fragmented (0x2000) (while IP_REASSEMBLY == 0).

I tried enabling IP_REASSEMBLY in lwip but that seems to change the issue to:
ip4_input: packet accepted on interface et
ip4_input:
IP header:
+-------------------------------+
| 4 | 5 |  0xc0 |       108     | (v, hl, tos, len)
+-------------------------------+
|    10568      |000|       0   | (id, flags, offset)
+-------------------------------+
|   64  |    1  |    0xe25b     | (ttl, proto, chksum)
+-------------------------------+
|  172  |   24  |    0  |    2  | (src)
+-------------------------------+
|  172  |   24  |   21  |  251  | (dest)
+-------------------------------+
ip4_input: p->len 108 p->tot_len 108
Unsupported transport protocol 1

Any ideas what the issue is here?

Best Regards,

Tim