[U-Boot] u-boot 1.2.0 -> 1.3.4 migration

[Alexander Danilov]

My bsp for u-boot 1.2.0 for AMCC PPC440EPx custom board works. I've
moved all bsp code to current u-boot version (1.3.4). All works fine
but I am getting program check exception when sending or receiving
packet over ethernet (EMAC0).
I've tryed to debug it but ethernet works when bdm connected.
What was changed in ethernet code for ppc4xx after 1.2.0?

Thanks, Alex