![]() Mac OS X has support for various disk image types built-in, some of which are: Library/Preferences/SystemConfiguration/ The behavior of the bootloader can be configured in the which can be found in: The bootloader can be eithe a MZ-PE/COFF or EFI fat binary type executables and is commonly stored in: The bootloader displays a dark grey Apple logo on the screen and loads the Darwin kernel from disk, as well as the essential driver extensions. The firmware starts the Mac OS X boot loader (boot.efi). Though it is not clear which header field the source is referring to but likely related to the "bless" utility. According to HFS+ volume header fields are used to point to a "blessed file" to be loaded as an EFI application. ![]() Mac OS X extends EFI with a read-only HFS+ driver. to print all of the firmware variables.Īdditional boot arguments can be provided via the "boot-args" value. ![]() The default boot volume is stored in NVRAM and can be configured through the "Startup Disk" preference pane or the nvram command line utility. The firmware is responsible for initializing the hardware and performing a POST (Power-On Self Test).
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