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AM335X GPIO question

Other Parts Discussed in Thread: TPS65910, TPS65910A, AM3358

I am designing with am335x and using Starter Kit for reference.

But I have some questions in my design.

1. On Starter Kit Board ,if system power on, we need to press a key.

     But in my design  the system power on when 5V adapter insert .so I fix the schematic. I delete Sw5, pull up

     the 33th pin of TPS65910A3 and connect 1th pin of TPS65910A3 to PMIC_PWR_EN pin of AM335X.

     Am I right?

     If I did, Do uboot and kernel are need to change?

2.In my design ,I need to use UART3_TXD function ,but in starter kit board this pin is used to DDR_VTT_EN,

   so I change GPIO0_12 to DDR_VTT_EN function .

   If I use GPIO0_12 to DDR_VTT_EN function, how to fix uboot and kernel ?

3.RGMII2_INT and RGMII1_INT pins are used in uboot and kernel? Need I to change the uboot and kernel

    if  I   change the other GPIOs to connect RGMII2_INT and RGMII1_INT?

4. The same questioin as question 3, how about AM335X_SPI0_CS1.