+config MTD_OTP
+ bool "Protection Registers aka one-time programmable (OTP) bits"
+ depends on MTD_CFI_ADV_OPTIONS
+ default n
+ help
+ This enables support for reading, writing and locking so called
+ "Protection Registers" present on some flash chips.
+ A subset of them are pre-programmed at the factory with a
+ unique set of values. The rest is user-programmable.
+
+ The user-programmable Protection Registers contain one-time
+ programmable (OTP) bits; when programmed, register bits cannot be
+ erased. Each Protection Register can be accessed multiple times to
+ program individual bits, as long as the register remains unlocked.
+
+ Each Protection Register has an associated Lock Register bit. When a
+ Lock Register bit is programmed, the associated Protection Register
+ can only be read; it can no longer be programmed. Additionally,
+ because the Lock Register bits themselves are OTP, when programmed,
+ Lock Register bits cannot be erased. Therefore, when a Protection
+ Register is locked, it cannot be unlocked.
+
+ This feature should therefore be used with extreme care. Any mistake
+ in the programming of OTP bits will waste them.
+