Network problem when using arm machine mcimx6ul-evk/cortex-a7

[Benjamin]

Hello list,

I have sucessfully built Linux kernel 4.14 armv7 and bootet Qemu using 
machine type mcimx6ul-evk + my base system.
[snip]
qemu-system-arm \
  -M mcimx6ul-evk \
  -cpu cortex-a7 \
  -m 512M \
  -kernel ./boot/4.14.146-armv7-x29.zImage \
  -dtb ./boot/imx6ul-14x14-evk.dtb \
  -serial mon:stdio \
  -display none \
  -append "console=ttymxc0 loglevel=8 bootmem-debug root=/dev/mmcblk1p1 rw 
boot_mode=normal" \
  -drive file=./disk/mmcblk1.raw,format=raw,id=disk1\
  -device sd-card,drive=disk1
[snap]

After boot, I am presented with 2 network interfaces eth0 and eth1.
In Qemu console I can, if I don't specify anything special, see the SLIRP 
networking.
[snip]
(qemu) info network
hub 0
 \ hub0port1: user.0: index=0,type=user,net=10.0.2.0,restrict=off
 \ hub0port0: imx.enet.0: 
index=0,type=nic,model=imx.enet,macaddr=52:54:00:12:34:56
imx.enet.1: index=0,type=nic,model=imx.enet,macaddr=52:54:00:12:34:57
[snap]
Other networking options work too bridge/tap, but the result is the same.

Unfortunately both interfaces have NO-CARRIER, link stays down, even though I 
have up'ed the interface.
[snip]
root@imx6ul:~# ip link set up dev eth0
root@imx6ul:~# ip link set up dev eth1
root@imx6ul:~# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state 
DOWN group default qlen 1000
    link/ether 52:54:00:12:34:57 brd ff:ff:ff:ff:ff:ff
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state 
DOWN group default qlen 1000
    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
[snap]

A full dmesg can be seen here http://paste.debian.net/1126093/.

Has anyone managed to boot a mcimx6ul-evk arm machine with functional network? 
Am I missing some PHY, dmesg
is reporting a Generic PHY (is that an issue?). I tried quite a lot, but 
finally ran out of ideas..

Thank a lot in advance.

Kind regards,
Benjamin