I am working on a kext that needs to read from NVRAM during early boot. My code uses <IOKit/IONVRAM.h>, which makes no mention of deprecation, but the corresponding library code seems to be in com.apple.kpi.unsupported, which sounds suspiciously like it may be on its way out.
While searching through available documentation, I was unable to find any other kernel space API for NVRAM access. Is there some other API or documentation that pertains to NVRAM access from kernel space?
Thanks Quinn. I didn't realize that I could simply look up the IORegistryEntry for IODeviceTree:/options, and invoke getProperty() on that. I didn't need com.apple.kpi.unsupported after all.
I’m not sure what the story is here. If no one else chimes in, you have a couple of choices:
post to the darwin-kernel mailing list, which has a bigger audience than this section of DevForums.
if that doesn’t pan out, open a DTS tech support incident and we will dig into this officially
Share and Enjoy
—
Quinn "The Eskimo!"
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"Thanks Quinn. I didn't realize that I could simply look up the IORegistryEntry for IODeviceTree:/options, and invoke getProperty() on that. I didn't need com.apple.kpi.unsupported after all.