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AM625: AM6254:slow startup speed and can not startup with SD card.

Part Number: AM625

Hi Ti expert,

My customer is testing our AM6254 in their own board. Their board is similar with BB's EVM and just change some IO power supply from 1.8V to 3.3V.

Now they met two problems:

1. Compared with BB's EVM, their own board has slow startup speed, up to 10s and then output CCCCCCCC. But if they use BB's EVM, it can immediately output CCCCCCCC.

2. Their own board can output CCCCCCCC with empty emmc but can not output CCCCCCCC when selecting SD card and will get stuck and have not any output.

3. Could you please explain the detailed printed information from BB's board and their own board.

Customer's board:


BB's board:


We are suspecting that it is related with the IO power supply(1.8V to 3.3V) and POR queue(3.3V delay). Could you please help review the schematic.