failed to load PcmMsrDriver.kext on OS X about pcm

[CBSears]

Thanks. I'm running 10.12 Sierra, so sudo nvram boot-args="kext-dev-mode=1" won't work.

Rebooting to recovery mode (reboot, command-option-r), starting a shell, csrutil disable and reboot does work.

[CBSears]

I'm submitting a pull request for MAC_HOWTO.txt to document how to do this:

kext Signing

If kextload.sh says the kext is "not loadable", you need to either disable System Integrity Protection or sign the kext.
You can disable SIP by rebooting into Recovery (reboot, command-option-R), opening a shell, csrutil disable and reboot again.
Signing a kext is more involved. You can't self-sign and will first need a Developer ID (https://developer.apple.com/contact/kext/)
You will then sign your kext with codesign(1).

[bo01ean]

You have to allow unsigned kexts:
https://developer.apple.com/library/content/documentation/Security/Conceptual/System_Integrity_Protection_Guide/KernelExtensions/KernelExtensions.html

Or sign the kext.

Allowing unsigned kexts is far easier.

[opcm]

@Olsonist I do not see your pull request. Could you please create one (again)?

[kzjeef]

For anyone meet same issue,

you can follow the instruction in this link to disable kext protection in your machine:

https://developer.apple.com/library/content/documentation/Security/Conceptual/System_Integrity_Protection_Guide/ConfiguringSystemIntegrityProtection/ConfiguringSystemIntegrityProtection.html#//apple_ref/doc/uid/TP40016462-CH5-SW1

the command to disable protection is

csrutil disable