Uboot 2015.07 porting to AT91SAM9260 user board

Hello,
i am newbie with U-Boot software, and i have few questions about porting U-Boot to user boards. I use AT91 board, which is based on AT91SAM9260ek. I have different Nandflash(H27U1G8F2B) and different PHY(DP83848C) for ethernet. I changed PHY address in /board/atmel/at91sam9260ek.c from 0x00 to 0x03. Now U-Boot detects PHY, but when i set IP, NM, GW, and MAC to enviroment variables, networking not works. Is defined somewhere in config files which driver is assigned to which board, or is U-Boot auto detecting and using drivers for another PHY chips?

Sorry for my questions, but i cant find answer for this on internet.

Thanks for every reply.

Steev.

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