8SW1 Switch and BOOT ROM button on AML_A311D-CC

Hey guys,

can´t find any info on what switch 8SW1 is used for on my alta. (the one near ehternet port, not SPI/MMC). not even in schematics found…
and how is the boot USB ROM boot button intended to be used ?

thanks & greets

8SW1 is used to enable the GPIO or CLK_B lines for dual camera support.

4SW1 is used to enable or disable booting from the SPI-NOR for you to use your own bootloader from a MMC device.