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Kernel Development

Yocto Kernel Development

The Yocto Project provides a flexible set of tools and processes to help you create custom Linux-based systems for embedded products. Kernel development is a key aspect of this process, allowing you to customize the kernel to support your specific hardware requirements.

Navigating MenuConfig

To start configuring the kernel using menuconfig, do not run start-menuconfig.sh from within Visual Studio Code (VSCode). Instead, open a new terminal window using Ctrl+Alt+T and execute the script.

./menuconfig.sh --kernel

General MenuConfig Screen Navigation

Navigating the menuconfig screen involves using arrow keys, Enter, and Esc. Here are the basic steps for navigating to various device drivers:

  1. Network Devices Drivers

    • Navigate to: Device Drivers -> Network device support -> Ethernet driver support
    • Navigate to: Device Drivers -> Network device support -> USB driver support
    • Navigate to: Device Drivers -> Network device support -> Wireless LAN

  2. USB Device Drivers

    • Navigate to: Device Drivers -> USB support

  3. Dummy Network Interface (Optional for QEMU)

    • Navigate to: Device Drivers -> Network device support -> Network core driver support

Login BMR to Assertain Hardware

Steps for Identifying Hardware

  1. Identify Ethernet Hardware

    • Command: lspci | grep -i ethernet
      • Description: Lists all PCI devices and filters for Ethernet controllers.
    • Command: dmesg | grep -i ethernet
      • Description: Displays the system message buffer and filters for Ethernet-related messages.
    lspci | grep -i ethernet
dmesg | grep -i ethernet

  2. Identify Wireless Hardware

    • Command: lspci | grep -i wireless
      • Description: Lists all PCI devices and filters for Wireless controllers.
    • Command: dmesg | grep -i wireless
      • Description: Displays the system message buffer and filters for Wireless-related messages.
    lspci | grep -i wireless
dmesg | grep -i wireless

  3. Identify USB Hardware

    • Command: lsusb
      • Description: Lists all USB devices connected to the system.
    • Command: dmesg | grep -i usb
      • Description: Displays the system message buffer and filters for USB-related messages.
    lsusb
dmesg | grep -i usb

Additional Tips

  • Save Configuration : After making changes, make sure to save your new kernel configuration. You can save it to the default .config file or specify a different filename.
  • Build Kernel: Once the configuration is saved, build the kernel using your build system (e.g., bitbake for Yocto). Make sure to deploy the new kernel to your target device.
  • Documentation: Refer to the Yocto Project Kernel Development Manual for detailed instructions and advanced configurations.

By following these steps, you can customize the kernel to support your specific hardware, ensuring optimal performance and compatibility for your embedded system.