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Cannot load u-boot.img with ymodem

Hello,

I'm trying to bring up a custom AM335x board but unable to load u-boot.img.  I was able to load the u-boot-spl.bin file through xmodem. After it finished executing the spl, I was not able to send in the u-boot.img.  I put some debug messages along the xyzModem functions and notice that it is waiting for an incoming byte in CYGACC_COMM_IF_GETC_TIMEOUT().  

I'm currently stuck and have no idea how to move forward. Any guidance would be great.