Greg,
Thanks for the info. Unfortunately when I made that change to the PMU_MISC1 register, my PCIe link did not come up at all which is a bit mystifying given it worked for you. Are you using an i.MX6 Solo or a Dual/Quad?
I think I have got my BARs working though. The latest reference manual I got today gave me the correct PCIE_RC register map and with that, I'm now properly setting the PCIE_RC_COMMAND register with bus master enable, I/O space enable and memory space enable. That got me access to my I/O space BAR.
Carolyn
On Thu, Nov 8, 2012 at 5:07 AM, Greg Topmiller Greg.Topmiller@jdsu.comwrote:
Carolyn,
It contains 0x40000960. Yes we did change the code to clear LVDSCLK2_IBEN and then set the LVDS_CLK2 to SATA then set LVDSCLK2_OBEN.
BTW, I made a mistake in the binary value to select SATA in the message below. It should be 01011b.
Regards,
Greg Topmiller Staff Software Engineer 240-404-2620 Greg.topmiller@jdsu.com
From: Carolyn Smith [mailto:carolynsmi56@gmail.com] Sent: Wednesday, November 07, 2012 3:03 PM To: Greg Topmiller Cc: Fabio Estevam (festevam@gmail.com); u-boot@lists.denx.de Subject: Re: PCIe on the i.MX6?
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@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 <#13ae1e3126c39f70_> 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?