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→Important note for DualLite/Solo based products (manufacture mode management)
* BOOT_MODE_SEL = 0
** primary boot device is SD1
* in boot ROM will try to boot a valid image from the SD card first, and then from the SPI NOR. In case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically
* BOOT_MODE_SEL = 1 or floating
** primary boot device is SPI NOR flash connected to eCSPI1
Selection of primary boot device is determined by the BOOT_MODE_SEL signal as follows:
* BOOT_MODE_SEL = 0
** primary boot device is SD1 (see section TBD for more details)
** in case no valid image is found in SD card, boot ROM shall enable USB serial download mode automatically
* BOOT_MODE_SEL = 1 or floating
** primary boot device is NAND flash (see section TBD for more details)
** 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.
