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There are actually three methods for installing the U-Boot binaries:

1. usb mass storage mode: The board presents itself as a usb drive to the host PC

2. DFU: The board listens for the DFU protocol on USB

3. the hard way: load and write files by hand using u-boot commands

We highly recommend using methods 1 or 2 as they are much easier to understand than the third!

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CONFIG_SPL_BOOT_DEVICE_SATA=y
CONFIG_SCSI_AHCI=y
CONFIG_SPL_SATA_RAW_U_BOOT_USE_SECTOR=y
CONFIG_SPL_SATA_RAW_U_BOOT_SECTOR=0x8a
CONFIG_ENV_IS_NOWHERE=y

• SPI

CONFIG_SPL_BOOT_DEVICE_SPI_FLASH=y

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