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@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?