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AM5726: Debug port doesn't work

Part Number: AM5726

Hi, i'm porting the Linux into our AM5726 custom board. it booted by SD-Card(mmc1). the mmc1 amd mmc2 of my custom board are sd-card. it is almost  same with am572x evm board. it only has different from peripheral of  am572x evm board(EMMC,HDMI, USB, etc). 

i have 3 question.

1. is the custom board working by am572x evm image?,  even if the board is not working, the debug is printed? (custom board has same debug port with am57xx evm board)

2. i modified mmc2 as sd-card. and i tested it. the debug print nothing even error.

3. could you let me know where i get information to boot?

thank you.