I was able to run the GiantBoard and put it into the Ultra Low Power Mode 1 (ulp1) as it is pre-configured in the uEnv.txt file.
I was also able to wakeUp the device by pressing the button.
Now I would like to try the BSR (backup-self-refresh) mode.
I exchanged the line in uEnv.txt
Afterwards I rebooted the device and checks by reading the file /proc/cmdline, if the change was applied.
Then I wrote “mem” to /sys/power/state
The problem appeared after pressing the button, to wakeUp the device.
The UART-TX-PIN shows:
BKP: Failed to find the canary! Rebooting
BKP: @0xf8044000: 0x1 @0x20b0b538:0x9505f6cd -> resume @0x2010cb4cÿRomBOOT
in a endless loop.
Do I forgot anything ?
Thanks for your help.