Usage: ./sunxi-fel [options] command arguments... [command...]
        -v, --verbose                   Verbose logging
        -p, --progress                  "write" transfers show a progress bar
        -l, --list                      Enumerate all (USB) FEL devices and exit
        -d, --dev bus:devnum            Use specific USB bus and device number
            --sid SID                   Select device by SID key (exact match)

        spl file                        Load and execute U-Boot SPL
                If file additionally contains a main U-Boot binary
                (u-boot-sunxi-with-spl.bin), this command also transfers that
                to memory (default address from image), but won't execute it.

        uboot file-with-spl             like "spl", but actually starts U-Boot
                U-Boot execution will take place when the fel utility exits.
                This allows combining "uboot" with further "write" commands
                (to transfer other files needed for the boot).

        hex[dump] address length        Dumps memory region in hex
        dump address length             Binary memory dump
        exe[cute] address               Call function address
        reset64 address                 RMR request for AArch64 warm boot
        readl address                   Read 32-bit value from device memory
        writel address value            Write 32-bit value to device memory
        read address length file        Write memory contents into file
        write address file              Store file contents into memory
        write-with-progress addr file   "write" with progress bar
        write-with-gauge addr file      Output progress for "dialog --gauge"
        write-with-xgauge addr file     Extended gauge output (updates prompt)
        multi[write] # addr file ...    "write-with-progress" multiple files,
                                        sharing a common progress status
        multi[write]-with-gauge ...     like their "write-with-*" counterpart,
        multi[write]-with-xgauge ...      but following the 'multi' syntax:
                                          <#> addr file [addr file [...]]
        echo-gauge "some text"          Update prompt/caption for gauge output
        ver[sion]                       Show BROM version
        sid                             Retrieve and output 128-bit SID key
        clear address length            Clear memory
        fill address length value       Fill memory