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AM2432: SBL stuck at sciclient_waitForMessage() for one particular board

Part Number: AM2432

Hi experts,

My customer is testing with their own board using am243x. One of their boards suddenly fails to boot. There is no SBL output on the uart. When they connect the R5 and load the sbl symbols, they saw the SBL is stuck at the following place 

What's the sbl doing in here? Any idea what might be the issue?

Note that this only happens to one of their boards. The rest of the batch works normally. 

Regards,

Hang.