What is what is bdcfg, devdata, devconf in lede mtd

What is what is bdcfg, devdata, devconf in lede mtd. I can't find any info on the wiki or google. thanks

Those are probably the partition names as used by the OEM firmware. The names suggest they do contain useful data, but the specifics really depend on the hardware and manufacturer. You can always inspect their contents if you're curious (use a backup copy, you can often just cat the MTD devices).

i think bdcfg is read to get the mac address by the boot script