{"id":551,"date":"2022-09-10T16:47:11","date_gmt":"2022-09-10T23:47:11","guid":{"rendered":"https:\/\/sysprogs.com\/tutorials\/?p=551"},"modified":"2022-09-12T09:37:48","modified_gmt":"2022-09-12T16:37:48","slug":"debugging-raspberry-pi-kernel-modules-using-prebuilt-kernels","status":"publish","type":"post","link":"https:\/\/sysprogs.com\/VisualKernel\/tutorials\/raspberry\/prebuilt\/","title":{"rendered":"Debugging Raspberry Pi Kernel Modules using Prebuilt Kernels"},"content":{"rendered":"

This tutorial shows how to create, build and debug a basic kernel module for Raspberry Pi using VisualKernel 4.0 and pre-built Raspberry Pi kernel symbols.<\/p>\n

Using the pre-built kernel image avoids the need to build the kernel on a separate Linux machine and allows quickly navigating the kernel source code using the IntelliSense code database included with the image.<\/p>\n

    \n
  1. Start Visual Studio and locate the VisualKernel Linux Kernel Project Wizard:\"\"<\/a><\/li>\n
  2. Choose a name for the project and enter the location where you would like to store it: \"\"<\/a><\/li>\n
  3. Proceed with the default “Hello, World” project template:\"\"<\/a><\/li>\n
  4. Make sure your Raspberry Pi is running the latest SD card image and can be accessed via SSH. Then, select “Setup a new target -> Target an Embedded Device”, open the drop-down list and click “Create a new SSH connection”:\"\"<\/a><\/li>\n
  5. Enter the host name, user name and the password to connect to the Raspberry Pi. Then, click Create<\/strong> to proceed: \"\"<\/a><\/li>\n
  6. Proceed with the default settings on the “Build Settings” page of the wizard:\"\"<\/a><\/li>\n
  7. VisualKernel will detect the Raspbian distribution running on the Raspberry Pi and will suggest automatically downloading a matching pre-built kernel image: \"\"<\/a>VisualKernel can automatically download and install both 32-bit kernels (v7l+<\/strong>) and 64-bit kernels (v8+<\/strong>).<\/li>\n
  8. Select it from the list and click “OK”. VisualKernel will download the image and will install it, along with the build environment, on the Raspberry Pi:\"\"<\/a>After the installation, your Raspberry Pi will be rebooted and you will be able to build the modules directly on it, as if it was a regular desktop Linux distribution.<\/li>\n
  9. Proceed with the default settings of storing the sources on the Windows side and uploading them during build:\"\"<\/a><\/li>\n
  10. Follow this tutorial<\/a> to setup JTAG debugging on your Raspberry Pi. Once it works, select the corresponding settings on the last page of the wizard:\"\"<\/a><\/li>\n
  11. VisualKernel will create a basic project. Build it via the Build->Build Solution<\/strong> command, set a breakpoint in the init() function and press F5 to begin debugging: \"\"<\/a><\/li>\n
  12. Once the init() function finishes running and the kernel unloads the .init<\/strong> section, VisualKernel will automatically disable the breakpoint. You can load and the unload module using the button on the right side of the GDB Session window:\"\"<\/a><\/li>\n
  13. Use the Debug->Windows->Live Variables<\/strong> command to see the real-time values of various variables in your module, or the kernel itself. E.g. you can see (and plot) the jiffies<\/strong> variable counting the internal time:\"\"<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    This tutorial shows how to create, build and debug a basic kernel module for Raspberry Pi using VisualKernel 4.0 and<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[37],"_links":{"self":[{"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/posts\/551"}],"collection":[{"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/comments?post=551"}],"version-history":[{"count":4,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/posts\/551\/revisions"}],"predecessor-version":[{"id":571,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/posts\/551\/revisions\/571"}],"wp:attachment":[{"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/media?parent=551"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/categories?post=551"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sysprogs.com\/tutorials\/wp-json\/wp\/v2\/tags?post=551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}