I have some issue with network subsystem. When i build target fsl-image-gui i can not make it working (i mean networking).
When kernel starting I get

Configuring network interfaces... eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=1:00, irq=-1)
udhcpc (v1.20.2) started
Sending discover...
PHY: 1:00 - Link is Up - 100/Full
net eth0: FEC ENET: rcv is not +last
Sending discover...
Sending discover...
No lease, failing
Starting rpcbind daemon...rpcbind: cannot create socket for udp6
rpcbind: cannot create socket for tcp6
done.

 
And then if i type
 
root@imx6qsabresd:~# udhcpc -i eth0 -n

I get
 
udhcpc (v1.20.2) started
Sending discover...
Sending discover...
Sending discover...
net eth0: FEC ENET: rcv is not +last
No lease, failing
root@imx6qsabresd:~#

 
Once i was able to connect to my board via ssh. But in shart time connection was refused.
So i can not get lease from my dhcp. If i use static ip and netmask network not working too. Sometime i get messages like this:

net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last
net eth0: FEC ENET: rcv is not +last

Almost forgot:

root@imx6qsabresd:~# uname -a
Linux imx6qsabresd 3.0.35-1.1.0+yocto+g21304e1 #1 SMP PREEMPT Wed Oct 9 17:15:15 MSK 2013 armv7l GNU/Linux