SPRADH9 June   2024 AM6442

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Abbreviations
  5. 2Introduction
    1. 2.1 Peripheral Component Interconnect Express
      1. 2.1.1 Components of PCIe Communication
        1. 2.1.1.1 Root Complex
        2. 2.1.1.2 Repeater
        3. 2.1.1.3 Endpoints
      2. 2.1.2 Signaling
        1. 2.1.2.1 PERST
        2. 2.1.2.2 WAKE and CLKREQ
        3. 2.1.2.3 REFCLK
      3. 2.1.3 PCIe Common Usage
      4. 2.1.4 PCIe Aggregate Throughput
    2. 2.2 PCIe Features on AM64x and AM243x
  6. 3X86 as RC and AM64x as EP
    1. 3.1 Hardware Environment
    2. 3.2 Software Environment
      1. 3.2.1 Building Application
      2. 3.2.2 Usage
  7. 4Test Setup
    1. 4.1 Common Setup for LINUX and WIN
    2. 4.2 Linux Driver (VFIO)
      1. 4.2.1 Prerequisites
      2. 4.2.2 Building
      3. 4.2.3 Deploying
    3. 4.3 Test Application Usage
    4. 4.4 Setup Steps for LINUX PC
      1. 4.4.1 UART Console Output
    5. 4.5 MSI Example
    6. 4.6 Setup Steps for WINDOWS PC
      1. 4.6.1 Prerequisites
      2. 4.6.2 Building
      3. 4.6.3 Deploying
  8. 5PCIe Test Specification
    1. 5.1  Identification and Configuration Functionalities
      1. 5.1.1 Test Case
    2. 5.2  Reference Clock Functionalities
    3. 5.3  Inbound ATU and BAR Functionalities
    4. 5.4  Outbound ATU Functionalities
    5. 5.5  MSI Functionality
    6. 5.6  Downstream Interrupt Functionality
    7. 5.7  Device Power Management State Functionality
    8. 5.8  Function Level Reset Mechanism
    9. 5.9  Legacy Interrupt Mechanism
    10. 5.10 MSI-X Capability
    11. 5.11 Hot Reset Mechanism
  9. 6Windows Example Driver Verification
  10. 7References

4.3 Test Application Usage

  • To run the pcie_enumerate_ep example application the AM24x EVM needs to be booted with the NULL bootloader (SOC Initialization Binary).
  • The pcie_enumerate_ep example can then be loaded via CCS 12.4 and the onboard XDS110.
    AM6442
  • The pcie_enumerate_ep example prints the output on the EVM's debug UART.
    AM6442
  • If the pcie_enumerate_ep example is started on an AM24x EVM that is NOT connected to an x86 RC, or if the x86 is not powered, the only output is going to be:
    PCIe: initialized and waiting for link
  • Afterward, the sample application is waiting for a PCIe link to be established, which requires the RC. Once the cable is connected and the RC is powered, the application outputs the state changes:
    PCIe: link detected
PCIe Link Parameter: PCIe Gen1 with 2.5 GT/s speed, Number of Lanes: 1
EP is in D0 state
PCIe: signaling APPL ready
APPL: pcie ready
  • At this point, the application is ready for configuration through the RC driver, either ti-sample-vfio or ti-sample-kmdf.