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Linux/am5728: Enabling early printk

Part Number: AM5728
Other Parts Discussed in Thread: AM5728

Tool/software: Linux

I'm trying to booting linux on my customboard, based on sitara am5728.
But no more output is seen on the console after "Starting kernel..."
I want to enable early printk for debugging linux booting procedure.
I've enabled this options in menuconfig and setted bootargs variable in u-boot environment:

  Kernel hacking->
      [*] Kernel low-level debugging functions
            (X)Kernel low-level debugging messages via OMAP2 UART3 (n8x0) 
      [*] Early printk 

  setenv bootargs console=ttyO2,115200n8 earlyprintk

After booting it's still only "Starting kernel.." message.
What I am doing wrong? Can anybody help me to activate earlyprintk mode?