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Original question:

TDA4VM: Questions related to PCIe for SOC to SOC communication

TDA4VM: SoC to SoC communication between two boards via PCIe

felix_123
Expert 1251 points
Part Number: TDA4VM

Hi TI,

I am currently trying to transmit data between to TDA4VM EVM Boards, which are connected via PCIe. I followed the instructions given for the PSDKLA and I ran pcitest.sh to test if the connection is working. As far as I have understood, the kernel driver, which is automatically loaded to enable communication between two boards (pci_epf_test), only allows me to send random bytes (the only modifications I can make are the size of the data and wether to use dma or not).

So in the next step I wanted to transmit "real" data via PCIe. But I have several questions here.

Q1: Is there already a kernel driver, which enables transmission of real data in the PSDKLA which is currently not automatically loaded from the kernel?

Q2: If there is no such kernel driver, is the only possibility to transmit data, editing the existing kernel driver (pci_epf_test ...) to enable this functionality?

Q3: If I have to edit the kernel drivers to enable this functionality, which files are important here? I have seen that there are some dependencies with RC (pci_endpoint_test.c) and EP drivers (pci-epf-test.c). But I do not have an overview yet.

Thank you!  

  • 0
    TI__Mastermind 23125 points

    Hello, 

    You mentioned PSDKLA, though I am not sure you have visited the processor SDK Linux Developer's guide, at:

    software-dl.ti.com/.../PCIe_End_Point.html

    All related files are explained in this page toward the bottom of the page. Please let me know if you have additional questions beyond what you raised above. 

    regards

    Jian

  • 0 in reply to jian35385
    Expert 1251 points

    Hi Jian,

    thanks, I am aware of this guide and I followed all steps which are described there. But I came to the conclusion, that using pcitest only proves, that SoC to SoC communication is working by sending random bytes. There is no possibility to transmit "real" data, like variables, structs, ... (please correct me if I'm wrong). So my first question is still open.

    Thanks again.

  • 0 in reply to felix_123
    TI__Mastermind 23125 points

    Felix, 

    you are correct. but you can modify:

       drivers/pci/endpoint/functions/pci-epf-test.c

    to initialize the  allocated buffer. 

    regards

    jian