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After device finish engineering prototypes stage, hardware engineer will need to provide test specification and pass criteria base on the product specification. Production test also could be treated as a simplified regulatlation test, because it has to fulfill standard of worldwide standard (for example: GSM) of local regulation (for example: Wi-Fi).
The target of production test, is deliver quality products. And production test won't go through all engineering details, because factory have time constriant on each station and production line also has cycle time for efficient for production.
Fixture design base on required test item and test point location.
Surface mount -> Visual inspection -> DM1 download (JTAG) -> GSM firmware download -> GSM test -> DM1 test -> Attach Bluetooth/Wi-Fi/LCM -> DM1.5 (Boot from SD card) -> Housing assembly -> DM2 (Boot from SD card)-> QA -> Packaging -> QA -> Release
DM1 is target for verify main chip component's basic function and surface mount quality. GTA02 integrate DM1 test functions into u-boot, and using the debug board JTAG interface download production u-boot to target board.
In GTA02, after assembly, will Re-test all DM1.5 function
DM2 specific test including: