USB On PCM043?
s.hauer at pengutronix.de
Thu Jul 19 12:11:39 EDT 2012
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
> 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.
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