In our case, to stop the use of Apple's built in driver, we need to install a codeless kernel extension (kext). Unfortunately this also prevents you from stopping the use of Apple's built in FTDI driver, which you must do in order to run applications that use FTDI's D2XX library. SIP prevents any user, even those with system administrator (“root”) privileges, modifying a number of operating system directories and files. This is part of Apple’s System Integrity Protection ( SIP), also known as “rootless” mode. Previously you could just unload the driver when you wanted to run your SDR software, but Mac OS X 10.11 El Capitan compounds the problem by making that impossible under normal conditions. More:Ĭhris Smolinski of Black Cat Systems tells us: If you use an SDR-14 or SDR-IQ with Mac OS X 10.10 or 10.11, you may run into issues due to Apple’s built in FTDI USB port driver, which prevents the FTDI D2XX library from accessing it. As of version 10.10 and 10.11 Mac OS X, extra steps may be required to allow the SDR-14 and SDR-IQ to operate, depending on Apple's bug fix schedule.
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