Debug Tips for DM81xx Boot Fail

1. Check the power supplies are within spec or not.

2. Clocking:

• If you are using LVCMOS-Compatible Clock Input, pls check if the clock output is ok and within spec.
• If you are using crystal, pls check if there is clock output from MXO pin.

3. Check the power on sequence & reset are following spec.

4. Detect the boot pins are pullup/down as you expected or not. You can doulbe confirm this by checking the CONTROL_STATUS.SYSBOOT (System Boot Type and the default value comes from BOOT[4:0] pins) to see if it is matched with the HW pullup/down on your board.

5. Check the trace vector values to understandthe stage of the ROM code. You need to use JTAG to connect the board with CCS.
The address of the trace vectors are as below table.

For meaning of each bit of trace vector, pls check the TRM-> ROM Code Memory and Peripheral Booting-> Tracing.