Powering Pixhawk from USB only

Can I power a Pixhawk solely from the USB port of an onboard raspberry pi? I don't see why I couldn't considering the pi can output up to 1.2 amps from its USB port, but several sites I've read online have dismissed the notion of USB power as useless during flight.

Also, is telemetry from the serial ports disabled while the pixhawk is receiving power through USB?

Any input would be appreciated, thanks.

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