[Solved / Archived] 2 out of 3 Vivid unit has the same MAC address

After flashing the system, the Linux kernel will generate the MAC address during the first boot. It seems the kernel may give the same MAC for different devices.

It is possible to write the new MAC address into RK Vendor Storage (a special region on the eMMC).

You may create such a BASH script, and run it to generate a MAC address from the eMMC chip serial number, which should be unique:

#!/bin/bash

ROOT_PART_DEV=$(findmnt / -o source -n)
echo "ROOT_PART_DEV=${ROOT_PART_DEV}"

ROOT_PART_NAME=$(echo "$ROOT_PART_DEV"| cut -d "/" -f 3)
echo "ROOT_PART_NAME=${ROOT_PART_NAME}"

ROOT_DEV_NAME=$(echo /sys/block/*/"${ROOT_PART_NAME}" | cut -d "/" -f 4)
echo "ROOT_DEV_NAME=${ROOT_DEV_NAME}"

ROOT_DEV="/dev/${ROOT_DEV_NAME}"
echo "ROOT_DEV=${ROOT_DEV}"

ROOT_PART_NUM=$(cat "/sys/block/${ROOT_DEV_NAME}/${ROOT_PART_NAME}/partition")
echo "ROOT_PART_NUM=${ROOT_PART_NUM}"

MACH="face"
EMMCSERIAL=$(cat /sys/class/block/${ROOT_DEV_NAME}/device/serial)
MACL=${EMMCSERIAL#0x}
MAC=${MACH}${MACL}
echo "MAC=${MAC}"

sudo /usr/bin/vendor_storage -w VENDOR_LAN_MAC_ID -t string -i $MAC

You will need to reboot your device to see the new MAC address.

Thank you so much! Worked perfectly.