Modify the source using devtool

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Kernel

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QDL tool

devtool modify qdl
INFO: Source tree extracted to <workspace>/build/workspace/sources/qdl
INFO: Using source tree as build directory since that would be the default for this recipe
INFO: Recipe qdl now set up to build from <workspace>/build/workspace/sources/qdl

1. Check out the following tree locally:
   tree -L 2 build/workspace/
   build/workspace/
   ├── appends
   │   └── qdl_git.bbappend
   ├── conf
   │   └── layer.conf
   ├── README
   └── sources
       └── qdl
   
2. Inspect the checked-out QDL source tree:
   ls workspace/sources/qdl/
   firehose.c  LICENSE  Makefile  patch.c  patch.h  program.c  program.h  qdl.c  qdl.h  README  sahara.c  ufs.c  ufs.h  util.c
   
3. Change the source tree under workspace/sources/qdl/ and build your changes:
   devtool build qdl
   devtool build-image qcom-multimedia-image
   

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Weston

devtool modify weston
INFO: Adding local source files to srctree...
INFO: Source tree extracted to <workspace>/build/workspace/sources/weston
INFO: Recipe weston now set up to build from <workspace>/build/workspace/sources/weston

1. Check out the following tree locally:
   tree -L 2 build/workspace/
   build/workspace/
   ├── appends
   │   └── weston_10.0.2.bbappend
   ├── conf
   │   └── layer.conf
   ├── README
   └── sources
       └── weston
   
2. Inspect the checked-out Weston source tree:
   ls workspace/sources/weston/
   clients           COPYING      desktop-shell     include      libweston          meson.build        oe-local-files  pipewire    releasing.rst  tests  weston.ini.in
   compositor        data         doc               ivi-shell    libweston-desktop  meson_options.txt  oe-logs         protocol    remoting       tools  xwayland
   CONTRIBUTING.rst  DCO-1.1.txt  fullscreen-shell  kiosk-shell  man                notes.txt          oe-workdir      README.rst  shared         wcap
   
3. Change the source tree under workspace/sources/weston/ and build your changes:
   devtool build weston
   devtool build-image qcom-multimedia-image