Hi Fred,
When you say it entered BOOTROM code, do you mean you can use blhost tool to talk with it? For example, when you execute the following command, you see correct response instead of ping failure?
blhost.exe -p COMxx -- get-property 1
Also, for the following description, I suppose when you press RESET button and power on tower board, the OPENSDA MCU will enter BOOTLOADER mode. So how do you power K80 tower board in this case?
I checked the TWR, then connected pin2-3 in J21, and pressed RESET button and Power-on, then release RESET button, MCU will run application in QSPI.
Hao