Template:FAQ/Questions/usb powering

Can a connex or verdex configuration be powered via a USB cable ?
Gumstix engineering has not tested this method of providing power via USB but suggests that a connex and verdex configuration may be able to be powered from a host computer and a USB cable.


 * On the breakout-gs and console-st boards, FB2 is populated with an SMD component - a resistor - that needs to be replaced with a ferrite bead as the FB is supposed to be a ferrite bead to accept USB power.

Note - The ferrite beads tend to be square in cross section. The resistors tend to be fairly flat in comparison.

Note - The resistors have their resistor code written on them as a 3 digit number. You'll see a couple with 103 (10K) and 203 (20K). The ferrite beads have no writing on them.


 * The console-vx and breakout-vx boards should come configured with the ferrite bead.

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An old, obsolete version of the PXA255 reference manual, section 4.2 "Bus Powered Device", claims that the PXA255 cannot be used as a "bus powered peripheral", and gives a brief technical reason. But does that reason really apply when connecting it to a typical PC?