[U-Boot] PCIe on the i.MX6?

[Carolyn Smith]

Hi Greg,

What is the exact value of your PMU_MISC1 register? Did you change the code
to clear LVDSCLK2_IBEN and set LVDSCLK2_OBEN as well?

We haven't tried a PCIe switch. We just have an FPGA directly connected to
the i.MX6.

Thanks,
Carolyn

On Wed, Nov 7, 2012 at 8:38 AM, Greg Topmiller <Greg.Topmiller at jdsu.com>wrote:

> Hi Carolyn,
>
> I saw your message on the Denx mailing list.
>
> I have the Novpek board with the MX6 quad on it and a full PCIe interface.
>  I am working in the Freescale Linux kernel and to get the interface to
> work we had to change a clock source for the PCIe.  We had to use the LVDS2
> as SATA clock source rather than LVDS1 as SATA.  This is controlled by the
> PMU_MISC1 register at offset 0x20c8160.  In the reference manual it's
> section 49.7.6, page 4413.  Set the LVDS2_CLK_SEL (bits 9-5) field to SATA
> (010011b).  The original code set LVDS1_CLK_SEL (bits 4-0) to
> SATA(010011b).  Hope this helps.
>
> Our current problem is getting a PCIe switch to work with the MX6.  The
> upstream port config space is available but the down stream is not.
>  0x1f00000 is exposed as the upstream config space but I expected the down
> stream to be at 0x1f10000 but nothing there.  Let me know if you have any
> ideas.  Have you tried a PCIe switch yet?
>
> Thanks,
>
> Greg Topmiller
> Staff Software Engineer
> 240-404-2620 <#>
> Greg.topmiller at jdsu.com
>
>
> >Yes, I have the PCI clocks on. I can read the config space and can see the
> >PCIe bus traffic using a logic analyzer when I do so. When I try reading
> >memory or I/O space, I don't see any bus traffic.
> >
> >Thanks,
> >Carolyn
> >
> >On Thu, Nov 1, 2012 at 11:18 AM, Fabio Estevam <festevam at gmail.com>
> wrote:
> >
> >> On Thu, Nov 1, 2012 at 2:32 PM, Carolyn Smith <carolynsmi56 at
> gmail.com>
> >> wrote:
> >> > Hello,
> >> >
> >> > Does anyone have any experience with PCIe on an i.MX6 processor (in
> >> > particular the i.MX6 Solo)?
> >> >
> >> > I can access the config space of my PCIe device but can't seem to get
> its
> >> > BARs mapped in properly. I thought I had the viewports set up but
> when I
> >> > try to access the space, I just get a processor lockup.
> >>
> >> Have you turned on the PCI clocks?
> >>
>