[meta-xilinx] USB PHY problem on ZC702

[Mike Looijmans]

There was a bug in Vivado that made it toggle the wrong GPIO to reset the 
PHYs, depending on the MIO pin used. This is probably what fixed the FSBL for you.

The kernel patch does a cleaner job of resetting the PHY, since it can use 
EMIO of even GPIO expander ports.

M.

On 12/09/2014 12:21 PM, Alan Hughes wrote:
> Thanks for the prompt response Nathan.
>
> I've managed to solve this problem by using a newer FSBL (actually the one
> from the 2014.4 SDK release - we had previously used an older one which
> appears had a glitch in it).
>
> Regarding Yocto "Dizzy", I want to move us to that release next year, however
> not until we have successfully passed a design review milestone with our
> customer in mid-January (for obvious reasons, now I have it working I do not
> want to break it again).
>
> Alan
>
> 

Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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-----Original Message-----
> From: Nathan Rossi [mailto:nathan.rossi at xilinx.com]
> Sent: 09 December 2014 06:13
> To: Alan Hughes
> Cc: meta-xilinx at yoctoproject.org
> Subject: RE: [meta-xilinx] USB PHY problem on ZC702
>
>  > -----Original Message-----
>  > From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-
>  > bounces at yoctoproject.org] On Behalf Of Alan Hughes
>  > Sent: Monday, December 08, 2014 11:22 PM
>  > To: meta-xilinx at yoctoproject.org
>  > Subject: [meta-xilinx] USB PHY problem on ZC702
>  >
>  > I'm having a problem getting the USB port to operate on a Xilinx ZC702
>  > development board using Yocto Daisy 1.6.2.  This is probably a similar
>  > problem to what was discussed previously this month for the ZedBoard,
>  > but I cannot work out how to get the fix discussed in that thread
>  > applied to this platform.
>
> It probably is a similar issue, it always seems to popup every now and again.
>
>  >
>  >
>  >
>  > On boot the USB fails to initialise with the following kernel messages:
>  >
>  >
>  >
>  > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>  >
>  > zynq-dr e0002000.usb: Unable to init USB phy, missing?
>  >
>  > usbcore: registered new interface driver usb-storage
>  >
>  >
>  >
>  > We originally tried using the 3.15 kernel provided by ADI since we
>  > have a
>  > FMCOMMS4 board attached to the ZC702; after having problems with that
>  > went back to the linux-xlinx kernel defined in meta-xilinx, but also
>  > with no joy.
>
> Try meta-xilinx dizzy branch with poky/oe dizzy, the resolution for the
> zedboard/zc702/etc issue was only done in the dizzy/master branch against the
> linux-xlnx 3.14 kernel. If that works for you and you are happy to use dizzy,
> otherwise let me know and we can look at back-porting that change to daisy.
>
> Regards,
> Nathan
>