Booting A20 OLinuXino from USB

[sophia2005]

Hello everyone,
I'm trying to boot my OLinuXino A20 from a USB drive instead of an SD card, but it's not working. I've tried changing settings in u-boot, but the device still doesn't detect the USB. Has anyone successfully booted the A20 from a USB drive? I would appreciate a detailed guide or the necessary steps to configure U-Boot and the filesystem on the USB.