Using pktuart with 7i80hd

You will probably just have to ignore that (printed once) error message.
It is more of a warning than an error.

pktuart access without an llio->read would be very difficult.

I dont think the PktUART has that issue, its the standard UART that has problems with Ethernet (it should probably be re-written so that it gets along with Ethernets packetized read and writes rather than doing random I/O, or just drop it and use the PktUART)

I tested with the mesa_pkt_gyro comp and it does not have any complaints when
run with Ethernet cards (well other that the fact that I complains about no data since I don't have gyro connected)

Yes, there might be something about the ethernet handler. I attached the relevant part of the log.
One interesting thing is that there is no wired loop on the outputs, nevertheless the data arrives on rx.
The other is that it sends all 16 u32 data but after the first byte parser error and 3 bytes are lost.

Have you ever attached your HAL component?

Does the pkt_gyro test work?

linuxcnc.org/docs/2.8/html/man/man9/mesa_pktgyro_test.9.html

Yes it worked on a 7I96 Ethernet card (at least it loaded without serious complaint on a running LinuxCNC system)

It did complain that there was no data which is expected I guess

No, this was the mesa_uart component.