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23577Re: [nslu2-linux] Re: slug usb controller hurt?

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  • David Given
    Apr 9, 2009
      Hash: SHA1

      S├ębastien Lorquet wrote:
      > If I remove the two modules ehci_hcd and ohci_hcd, the slug does not
      > lock up when I plug the stick. So it's not electrical-only.

      USB devices are only allowed to draw more than a certain amount of
      current (50mA?) after being told by the host that the current's
      available. So possibly removing the EHCI and OHCI modules are preventing
      this happening, and therefore preventing the USB device from drawing
      enough power to cause the problem.

      OTOH if you're using a different power supply I'd have thought the
      problem would have gone away. I'm confused, as well. I wonder if the
      NSLU2 power circuitry is knackered? (Does it even *have* power
      circuitry? Is the power bus wired directly to the power supply socket?)

      - --
      David Given

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