uboot bootargs

Regarding a USB disconnection problem I am having, Texas Instrument Bin Liu emailed me the suggestion to:
“add option “usbcore.autosuspend=-1” into your uboot bootargs”

How do I do that? folder /boot/uboot is empty. Where do I find “bootargs”?

(kernel 4.1.10-ti-r21)


There's an active "cmdline=" (no # in front of it) add
usbcore.autosuspend=-1 to the end..