Bureaucrats, dave_user, Administrators
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→Important note for DualLite/Solo based products (manufacture mode management)
** primary boot device is NAND flash
** in case no valid image is found in NAND flash, boot ROM shall enable USB serial download mode automatically
===Important note for DualLite/Solo based products (''manufacture mode'' management)===
When Dual Lite or Solo processor are used, GPIO_1 and GPIO_4 signals need to be kept high during bootstrap stage in order to prevent the intervention of bootrom's ''manufacture mode''. Bootstrap stage has to be intended as the time elapsing between the release of hardware reset (CPU_PORn) and the execution of the first instruction of user code (typically this is the reset vector of U-Boot boot loader). Please note that, in case GPIO_1 signal is used to implement [[Reset_scheme_(AxelLite)#Handling_CPU-initiated_software_reset|software reset circuit]], it is high during bootstrap stage by design.
