[U-Boot] packet dropping problem in uboot

[Ali Ahari]

Dear All,
I have a board with a DSP processor and two Ethernet controllers(dm9000) .
U-boot is installed on the DSP processor which is configured to work with
these two Ethernets. I have two questions:
1- I can just work with one of the Ethernets at a time and  call eth_rx for
it, is it possible to work with both of ethernets and read data from them
as data arrives(currently I have implemented a polling mechanism to read
from both eths)?
2- I want to read packets from one eth and send it from another eth, but I
found out that I can just transfer ARP packets in this way and I can't even
read other packet types like UDP, Does uboot have a built-in mechanism for
dropping and filtering some kind of packets?

Regards,
Ahari