Are you asking a question or telling something? On Wed, Feb 6, 2013 at 1:34 PM, Siji Sunny <[email protected]> wrote: > It seems like the usb controller used* *in Rspberry pi SOC (Broadcom > BCM2835) has some serious issues , since it can only supply low amount of > current to its USB devices (Approximately 140 mA). This will cause > continues restart of RPI specially while connecting USB Network Card, USB > Modem or GPS devices. > > This may be a bug in USB driver, which has not fixed yet and may not be an > easy task because : > > (Ref: > http://hardware.slashdot.org/story/12/08/24/2228251/serious-problems-with-usb-and-ethernet-on-the-raspberry-pi > ) > > 1) Documentation on the Broadcom USB controller is proprietary and is not > made openly available by the Raspberry Pi Foundation. > > 2) The USB core for the Broadcom SoC was bought from a 3rd party, and we > are told that not even Broadcom has full documentation, nor understands the > driver. > > 3) The Foundation has discovered that the controller and its driver expect > realtime response from the ARM core, and if Linux's non-realtime scheduling > doesn't respond in 1 ms, a split transaction USB event can be dropped. Not > surprisingly, this occurs regularly and produces lost mouse clicks, stuck > keyboard keys, etc.. > > > -- > Siji Sunny > _______________________________________________ > ILUGC Mailing List: > http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
-- Gayatri Hitech http://gayatri-hitech.com _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
