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u-boot boot linux from usb
env set bootcmd_usb "run findfdt; usb start; if run loadimage_usb; then run usbboot; fi"
env set loadfdt_usb "fatload usb ${usbdev}:${usbpart} ${fdt_addr} ${fdt_file}"
env set loadimage_usb "fatload usb ${usbdev}:${usbpart} ${loadaddr} ${image}"
env set usbargs "setenv bootargs console=${console},${baudrate} root=${usbroot}"
env set usbboot "echo Booting from usb ...; run usbargs; if run loadfdt_usb; then bootz ${loadaddr} - ${fdt_addr}; else echo WARN: Cannot load the DT; fi"
env set usbdev 0
env set usbpart 1
env set usbroot "/dev/sda2 rootwait rw"
run bootcmd_usb
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