A thorough explanation of the directories generated by bitbake | Essential for troubleshooting Yocto development

Building an i.MX Development Environment (Yocto Edition) | Technical Column​Yocto ProjectI used it to build the i.MX BSP.

Once the build is complete, use the build toolbitbakeLet's take a look at the directories that were created. Knowing what kind of directories were created will improve development efficiency and be useful for troubleshooting.

In this article, I will organize and introduce frequently used directories using the environment where I built the i.MX BSP as an example. There are many directories, but I will focus on the directories that I Access frequently during development.

The directory to be introduced is here. The directory location isconf/local.confWe assume you have not changed the directory location in

• ${BBPATH}/tmp

  • work
  • work-shared
  • deploy

    • images
    • deb

Below, we will quote 4 Source Directory Structure from the Yocto Project Reference Manual as appropriate.

The following content is an image using NXP's BSP (L6.12.3_1.0.0) for the i.MX 95 Verdin evaluation kit.​imx-image-fullThis has been checked in the build environment.

${BBPATH}/tmp

${BBPATH}teethbitbakeThis is an environment variable that is defined when you enable , and it points to the build directory (<build/directory> in the commands below) that you passed when you executed the following command.

$ source setup-environment 
... (出力は省略)
$ echo ${BBPATH}
=> <build/directory> が出力される    

In this article, we will change the output to show the build directory.${BBPATH}The actual output will show the path, so please read it accordingly.

Now that the preamble is over,tmpLet's start talking about.bitbakeWhen I build a Linux image with${BBPATH}Directly belowtmpThis will create a directory called .

tmpThe word "temporary" comes from the word "temporary." Here is a relevant quote from the Yocto Project Reference Manual:

This is my personal interpretation, but I think the meaning of temporary is "directories and files in this directory will be deleted by bitbake."

"It's okay because it's managed with git"

It is not. Depending on the bitbake subcommand or option, the entire git management directory may be deleted.tmpDo not develop under this directory.

Now let's move on to the next level.

# Switch to Debian packaging and include package-management in the image
PACKAGE_CLASSES = "package_deb"