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AM3358: UART boot on Beaglebone Black

Part Number: AM3358

Hello,

I have a strange problem on my beaglebone hardware.

when i hold and press the boot button, then press the power button , it suppose to send characters "CCCCC" to mini com.  (No sd card connected )

But this behavior is non consistent. i mean, i see "CCCC"  very rarely . may be once in 20 attempts.

i complied the uboot for beagleone black and got u-boot-spl.bin and u-boot.img. But the board can not able to fetch the spl from xmodem. It doesn't initiate the transfer at all .

i doubt , my board is damaged because i dont see "CCCC" consistently .

Can you please help ?

Thanks