I use NXP website development board imx6ull - evk, cannot be started after receipt of the development board system, have been stopped in starting the kernel... ; But under uboot, can use DHCP, can also and another of the same network segment Linux host ping;
I use MFGTool to update the system, the BSP version 4.1.15 _2. 0.0, the update is complete, can normal boot the kernel, but unable to use Ethernet, in the uboot model, use DHCP command shows:
The BOOTP broadcast 1
* * * Unhandled DHCP Option in OFFER/ACK: 213
The DHCP client bound to address XXX. XXX. XXX. XXX (35 ms)
* * * Warning: no boot file name; Using 'C0A80867. Img'
Using FEC1 device
TFTP from server 0.0.0.0; Our IP address is XXX. XXX. XXX. XXX. Sending through gateway XXX. XXX. XXX. 1
Filename 'C0A80867. Img'.
The Load address: 0 x80800000
Loading: *
TFTP error: 'File not found: (1)
The Not retrying...




Start after the kernel, enter the ifconfig command, display:
Root @ imx6ul7d: ~ # ifconfig

Eth0 Link encap: Ethernet HWaddr 00: xx: xx: xx: xx: xx
The UP BROADCAST MULTICAST MTU: 1500 Metric: 1
Errors RX packets: 0:0 dropped: 0 overruns: frame 0:0
TX packets: 0 errors: 0 dropped: 0 overruns: carrier 0:0
Collisions: 0 txqueuelen: 1000
TX RX bytes: 0 (0.0 B) bytes: 0 (0.0 B)

Lo Link encap: Local Loopback
Inet addr: 127.0.0.1 Mask: 255.0.0.0
Inet6 addr: : : 1/128 Scope: Host
The UP LOOPBACK RUNNING MTU: 65536 Metric: 1
RX packets: 2 errors: 0 dropped: 0 overruns: frame 0:0
TX packets: 2 errors: 0 dropped: 0 overruns: carrier 0:0
Txqueuelen collisions: 0:0
RX bytes: 140 TX bytes (140.0 B) : 140 (140.0 B)
no dynamic allocation inet address, also does not have the inet6 address,

In the device tree configuration:
& Fec1 {
Pinctrl - names="default";
Pinctrl - 0=& lt; & Pinctrl_enet1 & gt;;
Phy - mode="rmii";
Phy - handle=& lt; & Ethphy1 & gt;;
The status="disabled".
};

& Fec2 {
Pinctrl - names="default";
Pinctrl - 0=& lt; & Pinctrl_enet2 & gt;;
Phy - mode="rmii";
Phy - handle=& lt; & Ethphy0 & gt;;
The status="okay";

Mdio {
# address - cells=& lt; 1 & gt;;
# size - cells=& lt; 0 & gt;;

Ethphy0: Ethernet - phy @ 2 {
Compatible="Ethernet phys - ieee802.3 - the c22";
Reg=& lt; 2 & gt;;
};

Ethphy1: Ethernet - phy @ {1
Compatible="Ethernet phys - ieee802.3 - the c22";
Reg=& lt; 1 & gt;;
};
};
};
Pinctrl_enet2 pin is configuration, Ethernet front-end ports normally on a green light, flash yellow interval around 2 s,
A great god please help have a look