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The following examples show the devtool usage for Qualcomm software components.

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Kernel

See Use Yocto to develop kernel.

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QDL tool

Use the devtool to modify the QDL source in the workspace created. 
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
The generated images are in the path build/tmp/deploy/images/rb3gen2-core-kit/qcom-multimedia-image.

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Weston

Use the devtool to modify Weston in the workspace created. 
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
The generated images are in the path build/tmp/deploy/images/rb3gen2-core-kit/qcom-multimedia-image.