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You can consider storing the manufacturing information in filesystem image. The data stored in filesystem should not be changed over the lifecycle of the device which is consistent with your requirement.
In production line, we need to flash a Single binary to all the boards and then program the serial number. Serial number shall be written using production application . example it can be updated through command line.
If we go with file system approach each board has to be programmed differently by updating the serial number file in file system.This will increase the production line overhead.
So is there a way to store the serial number in flash which shall be outside of the DCT, application and file system.
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In flash, our general recommendation is to store manufacturing information in DCT. There is a document /43xxx_Wi-Fi/doc/WICED-AN800-R-Factory-Programming.pdf which shows how to generate unique DCT image for a device.
Beyond DCT, the other options could be used to store device MAC address as explained in that document in section 4 such as OTP, NVRAM. However, OTP programming is an irreversible process.
If DCT is being updated, there is a possibility of loss of mfg information. However, we would not recommend storing the data in any other section of flash as it could risk program or data corruption.