fw_env.config setting for Beaglebone White?

[Daimusou]

I have fw_printenv installed, but the sample settings in /etc/fw_env.config all refer to a /dev/mtd device, that the white BeagleBone does not have. What are the correct settings for this device so that fw_printenv will work?

I am trying to change the mounting of the root filesystem to 'ro', but before I try to write a uEnv.txt to do that, I need to see what the existing settings look like.