I need to permanently store a bit of data (s/n and our company-assigned MAC address) in our ESP32-based products. From the docs, it seems as though I could use BLK3 for this. But I've looked at a few units, and they already have something stored right in the middle of BLK3:
Code: Select all
BLK1 Flash encryption key
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLK2 Secure boot key
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 R/W
BLK3 Variable Block 3
= 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f2 81 f3 82 00 00 00 00 00 00 00 00 00 00 00 00 R/W