Pano Data Block
The SPI flash block at address 0x8c0000 (G2 Rev B) or 0x6b0000 (G2_C) is a data block which is programmed by the factory and never updated.
Most of the data in this block is unknown.
These are the differences between two G2 Rev B Panos that both programmed with revision 2049.20 of the bitstream.
The MAC address of the Pano on the left side is 00:1c:02:70:1d:46, the right is 00:1c:02:70:43:66 from the dump we can guess that the 4 bytes at offset 0x0c of the block are the last 4 bytes of the MAC address.