> > > > I just don't understand why they are OK on Linux host PC and failed on > > Linux Host embedded MUSB OTG. > > PCs have to source up to 500mA load on usb bus, embedded otg/hosts only up > to 100mA. > > After digging into to hardware manual of our Blackfin BF54x EZKIT board, I think it can support up to 500 mA as it claimed and designed: P1-22 of ADSP-BF548 EZ-KIT Lite Evaluation System Manual http://www.analog.com/UploadedFiles/Associated_Docs/70955664ADSP_BF548_EZ_KIT_Lite_Manual_Rev_1_1.pdf --- The ADSP-BF548 processor has a built-in, high-speed USB on-the-go (OTG) interface and integrated PHY. This interface connects to a 24 MHz clock (U13), has surge protection, and can be configured as a host or device. When in device mode, the USB 5V regulator (VR1) and FET switch (U39) are turned OFF. When in host mode, the USB 5V regulator and FET are turned ON and can supply 5V at 500 mA. --- And they use this external regular to provide this: http://www.analog.com/en/prod/0,,766_818_ADP3336,00.html So one of the reason is the whole 500 mA providing method does not work, I just guess. I will contact with the hardware guy internally. Thanks -Bryan -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
