75XX USB Host

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The Cavium CPU supplies standard USB 2.0 ports. The power to the USB can also be toggled by setting a DIO. 

# This is sourced in the initrd, but if you are running
# from Debian you will need to source the subroutine file.
source /initrd/ts7500.subr

# Power off USB
setdiopin 7 0

# Power on USB
setdiopin 7 1
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