LPC55S16 lost in secure section (0x130166b2 / 0x4002840)

nxp-obrist · ‎10-26-2021

Hi,

I was able to access/debug the LPC55S16 EVAL Kit. I'm was implementing some second stage bootloader as shown in AN12327.

After implementing and some testing, I was flashing a image to the section 0x30000 via the MCUXpesso IDE and the onboard debug prob. After that I was not able to access the LPC55S16 again.

I changed to a external debug prob (j-link EDU) and was able to deepdive a little in the problem.

What happens is, that the program is trying to boot from the secure area at 0x130166b2 and then stays in an endless loop at 0x4002840

nxpobrist_1-1635252816912.png

nxpobrist_2-1635252867866.png

nxpobrist_3-1635252936106.png

Is there a way to clear the whole device and start again in the non secure area of the LPC55S16??

best regards

Corsin Obrist

FelipeGarcia · ‎10-28-2021

Hi Corsin,

Please follow the steps below:

Click on the "Clean Up debug" button on the main IDE toolbar - this kills any stale low level debug operations.
Disconnect the USB cable from your board to remove power
Place a jumper on the ISP header (JS3) - this will prevent the board booting the image in flash by forcing the MCU to enter ISP mode.
Now reconnect the USB cable to Debug Link connector (J1).
Now select a project in the Project Explorer view, and then click on the GUI Flash Tool on the main IDE toolbar - and use this to mass erase the flash.

Have a great day,

Felipe

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