codesigned kext But why not load in Yosemite(10.10)

Question

I had a code signing on kext in Yosemite. But kextload is failed.
It was version2 codesign. codesign --verify is true.
But kextload is failed. Why not load

Answer 1

As of December 2016:

This is due to the System Integrity Protection feature that was introduced in El Capitan (10.11). As of El Capitan, the kext-dev-mode boot option has no effect, so ParaDevil's answer does not work. Instead, you must disable SIP by following the instructions from this page:

1. Boot to Recovery OS by restarting your machine and holding down the Command and R keys at startup.

2. Launch Terminal from the Utilities menu.

3. Run the following command:

   csrutil disable
   

When you restart, System Integrity Protection should be disabled.