The NXP MCUXpresso Software Development Kit (MCUX) provides device header files and peripheral drivers for Kinetis, LPC, and i.MX SoCs. It was previously called the Kinetis Software Development Kit (KSDK), then renamed to include support for LPC and i.MX SoCs. The K64F and KW41Z sources in this directory are imported from mcux.nxp.com. MCUX for KW40Z is not yet deployed on mcux.nxp.com like most other devices, therefore the sources are imported from the KW40Z product pages on nxp.com: Kinetis KW40Z Connectivity Software(REV 1.0.1) https://www.nxp.com/webapp/Download?colCode=KW40Z-CONNECTIVITY-SOFTWARE&appType=license&Parent_nodeId=1432854896956716810497&Parent_pageType=product The current version supported in Zephyr is MCUX 2.2. It currently supports the following SoCs: - MK64F12 (aka K64F) - MKW41Z4 (aka KW41Z) - MKW31Z4 - MKW21Z4 - MKL25Z4 - MKW40Z4 (aka KW40Z) - MKW30Z4 - MKW20Z4 Additionally, it provides the following components: - overwrites header file for MCR20 Register values MCR20Overwrites.h (components/mcr20a/MCR20Overwrites.h) Origin: Kinetis MKW2xD and MCR20A Connectivity Software URL: https://www.nxp.com/webapp/Download?colCode=MKW2XD-MRC20A-CONNECTIVITY-SW&appType=license&Parent_nodeId=1425322332576706617013&Parent_pageType=productI Revision: (REV 1.0.0)