BROM

The A10 has several ways to boot. It has an integrated non-replaceable 32KiB ROM chip which could be considered the primary boot-loader. The boot-loader can boot the following options in order:


 * 1) SD Card0
 * 2) NAND Flash
 * 3) SD Card2
 * 4) SPI NOR Flash
 * 5) USB Boot

To boot from USB, a lot would need to 'fail' or skip booting, especially if there is on-board bootable data in NAND or SPI Flash. As a bypass mechanism, the A10 has the so called Boot Select Pin (BSP). This pin is normally internally pulled up by a 50KΩ resistor. If the pin is pulled low to GND, the A10 will try to boot from USB. Otherwise the above boot-order will be tried.