I ended up having to compile each OS version with the matching XCode. Build three times, once each for Catalina, BigSur and Monterey. Each with a different version of XCode (11, 12 and 13) using EXPORT DEVELOPER_DIR=/pathto/XCode-NN etc before the xcodebuild
sl149q
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Can you elaborate on how ChildDext is defined?
Also, how to set up the child dext to send and receive data from the parent dext?
In our KEXT we had a virtual interface (the parent) and each USB Device instance passes data to and from the virtual interface.
Thanks!