Maybe this is the exact information missing on factory chips to make them work with the switch? Prior to OTP programming, all values should be verified using the appropriate editable nvram.txt file, which is provided with the reference board design package.It is referencing a memory that can only be initialized once, and contains hardware configurations. Alternatively, multiple write cycles can be used to selectively program specific bytes, but only bits which are still in the 0 state can be altered during each programming cycle. The entire OTP array can be programmed in a single write cycle using a utility provided with the Cypress WLAN manufacturing test tools. After any bit is programmed to a 1, it cannot be reprogrammed to 0. The initial state of all bits in an unprogrammed OTP device is 0. Up to 484 bytes of user-accessible OTP are available. In addition, customer-specific parameters, including the system vendor ID and the MAC address can be stored, depending on the specific board design. Various hardware configuration parameters may be stored in an internal One-Time Programmable (OTP) memory, which is read by the system software after device reset.
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