Using the NVRAM for boot-time kext settings works (we use it here at VMware). I know of two ways to do that: 1) via boot-args, using PE_parse_boot_argn() That is fine if the driver only reads the variable. 2) via your own variables, using setProperty() and getProperty() on IORegistryEntry::fromPath("/options", gIODTPlane). The driver can read and write variables this way, but be aware that writes are actually committed to NVRAM only when OS X shuts down/reboots. The property name must be a string of the form [<UPPERCASED GUID>:]<NAME>. If <UPPERCASED GUID> is omitted, it defaults to the string 7C436110-AB2A-4BBB-A880-FE41995C9F82. But remember: the NVRAM space is very limited (to 64 KB, if I remember correctly)... Cheers, -- hpreg _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com