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

[nxp-obrist]

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

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]

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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