Device ID

View Device ID

If you need to check the device ID, you can read the serial number of
the core board. After reading successfully, it will return a string in
json format:

   linaro@bm1684:~$ cat /sys/bus/i2c/devices/1-0017/information
   {
   	"model": "SA5",
   	"chip": "BM1684",
   	"mcu": "STM32",
   	"product sn": "HQDZKETBWY2100012",
   	"board type": "0x01",
   	"mcu version": "0x38",
   	"pcb version": "0x12",
   	"reset count": 0
   }

Update Device ID

The device ID update is generally used to update the product SN
number, which is stored in the EEPROM of the MCU.

The user needs to modify it in the following ways:

(1) First you need to unlock the MCU EEPROM:

   sudo -i
   echo 0 > /sys/devices/platform/5001c000.i2c/i2c-1/1-0017/lock

(2) Write SN number:

   echo "HQATEVBAIAIAI0001" > sn.txt
   dd if=sn.txt of=/sys/bus/nvmem/devices/1-006a0/nvmem count=17 bs=1

(3) Finally, re-lock the MCU EEPROM to avoid accidental rewriting:

   echo 1 > /sys/devices/platform/5001c000.i2c/i2c-1/1-0017/lock