On Thu, Jul 19, 2012 at 03:37:47PM +0000, Jerry Kirk wrote: > We have been attempting to get USB Host mode working under Barebox(2012-07-0) on > a PCM043 platform (i.mx35), but we are having a bit of trouble. > > We have merged the CONFIG_USB specific code for "imx35_devices_init" and > "imx35_usb_init" from the Eukrea platform into pcm043.c, added the > "MX35_PAD_I2C2_CLK__USB_TOP_USBH2_PWR" and "MX35_PAD_I2C2_DAT__USB_TOP_USBH2_OC" > pad definitions (as per the main kernel pcm043.c file), added the "tmp |= 0x3 << > CCM_CGR2_USB_SHIFT" to enable the USB clock to "pcm043_core_setup", built > everything with the "usb" command enabled, and then loaded the new Barebox image > into our pcm043 board. We have USB_EHCI and USB_STORAGE enabled in the Barebox > config. > > If I execute the "usb" command then it returns that it has found 1 EHCI > controller. If I plug in any device, the only one it has EVER detected has been > a USB mouse. It will be detected most of the time following a reset and after > unplugging/replugging the mouse -- but will never be detected again after this > unless I do a reset/replug operation (and never on a "usb -f" forced redetect). > > Basically, our goal is to get USB flash drives working for use as a means of > upgrading our Linux kernel in the field -- but right now it won't even EVER > recognize a USB flash drive when it is plugged into the unit. We also know it is > not a hardware problem as all USB devices work just fine once the full kernel > finishes booting. > > From what we have read, it looks like the Eukrea platform had USB working in it, > and we have attempted to use it as a guide, but we still aren't having any luck. > > Does anyone know of any steps we might be missing? Or of anyone who has gotten > USB host mode working on a pcm043 under Barebox before? > > I think we are close, but something (obviously) still isn't right. Could it be that the USB clock operates at the wrong rate? I think it should be 60MHz. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
