topic Re: PCIe communication between two LS1028A processors (RC & EP) in Linux in Layerscape

PCIe communication between two LS1028A processors (RC & EP) in Linux

kumar_086 — Tue, 10 Jan 2023 10:36:57 GMT

Dear Experts,

We have two LS1028a cards connected over a backplane, one card running with RCW selected with PCIe_RC and other card with PCIe_EP. These cards are ported with Flexbuild v2012 U-Boot & Linux.

How to prove the data communication between these processors over PCIe interface?

Regards

Re: PCIe communication between two LS1028A processors (RC & EP) in Linux

khushbur — Mon, 16 Jan 2023 12:24:12 GMT

Hi @kumar_086

You can refer to drivers/pci/endpoint/functions/pci-epf-test.c in Linux Kernel source code.

For details about pci-epf-test.c, please refer to Documentation/PCI/endpoint/pci-test-howto.rst.

Thanks

Khushbu

Re: PCIe communication between two LS1028A processors (RC & EP) in Linux

kumar_086 — Fri, 14 Apr 2023 04:47:05 GMT

Hi @khushbur ,

We went through these files, compiled and ran the Linux.

As per the howto file, we should see the response as,

# ls /sys/class/pci_epc/
51000000.pcie_ep

But this file is not seen in our Linux,

root@TinyLinux:/sys/class/pci_epc# ls
root@TinyLinux:/sys/class/pci_epc#

No files were available in the shared path. Please let us know if any settings to be done in dts or Linux.

Thanks

Re: PCIe communication between two LS1028A processors (RC & EP) in Linux

kumar_086 — Wed, 26 Apr 2023 07:02:50 GMT

Dear NXP Team,
Looking forward for your inputs on this.

Thanks