BIOS Screenshots
I found the BIOS to offer far more than I had expected, appearing like a BIOS for one of their motherboards. If you want to add that additional drive and make it the primary boot device, or change the memory or something, these options will help you do so for sure. Whatever options the hardware provides, here they are at your fingertips, and for what is essentially a barebones SoC, I find that pretty incredible. Screenshots of every page follow: