What are ROM signatures used for

[johnburford]

How does a technician get every ROM's signatures on a logic board. The address mapping doesn't tell the ROM's signatures so how do you get them. Why does ROM chips have signatures, because RAM chips don't have signatures. A Technician needs the ROM's signatures to test the ROM chip.

 

[D.A.(Tony)Stewart]

Bit errors make the ROM defective. Checksum signatures make the contents more reliable. Each host may use a unique location for this computation and location so OEM specific drivers are used. In the old days it was the Data I/O programmer paid updates for different chip types.

https://forum.xda-developers.com/galaxy-s2/orig-development/30-10-2012-k-la-lp-t1103399