I have a custom board which is designed based i.MX6dl. In my system, first u-boot is loaded from a SPI Flash and then all other Ramdisk, Android System images are loaded eMMC or SD card. It is working very well now. But I need to load Ramdisk, System Image from USB stick.
I mean that, I want to use flash memory instead of SD card or eMMC. I have searched flastboot, but I can't use a PC from OTG, my device is working standalone and using a PC is very hard to update image in industrial environment.