[U-Boot] UEC phy not working on first try

[DUNDA Matthias]

Hi all-

I am using u-boot.2010.09 on a MPC8568-based board.

When trying to boot over one of the UEC network interfaces, it is not working instantly. The cable is connected from the beginning, but I have to issue a manual 'boot' command, sometimes even multiple times before the link is correct. This is the output:

[----------------------------- snip -----------------------------]
Net:   UEC0, UEC1, UEC3 [PRIME], eTSEC0, eTSEC1
Hit any key to stop autoboot:  0
UEC: PHY is Generic MII (70431)
UEC3: Full Duplex
switching to rgmii 100
UEC3: Speed 100BT
UEC3: Link is up
UEC3: Link is down
WARNING: adjusting available memory to 30000000
Wrong Image Format for bootm command
ERROR: can't get kernel image!
=> boot
UEC3: Full Duplex
switching to rgmii 100
UEC3: Speed 100BT
UEC3: Link is up
Using UEC3 device
TFTP from server 10.169.15.10; our IP address is 10.169.15.9
Filename 'uImage'.
Load address: 0x20000000
Loading: T #################################################################
         #################################################################
         ###########################
done
[...]
[----------------------------- snip -----------------------------]

Booting over the TSEC interfaces works without problems. Any idea what might be the problem?

Thanks
Matthias