#Bios custom boot path clover efi boot registration
Additionally NVRAM is used for registration of the iCloud and iMessage services. Clover provides this kind of information exchange, enabling correct Firewire functionality and the use of the Startup Disk preference panel. macOS uses a special memory called NVRAM for information exchange that is included in RuntimeServices (not present in a legacy loader).BIOS-based computers will use USB in legacy mode during the initial boot process, which becomes a problem when passing control to the OS.Further OS X tries to obtain data from the boot loader describing additional devices like the video, ethernet or sound card through so called EFI strings.ACPI tables - contained in the PC's ROM - are usually not written properly and may contain bugs, mostly because the manufacturer was lazy: an incorrect CPU core count in APIC table, NMI data is missing, missing reset register in table FACP, wrong power profile, missing EIST data in SSDT tables, and it is better to not even mention the DSDT table.SMBIOS (DMI) is filled with data emulating a real Apple Macintosh - a requirement for running macOS.CloverEFI firmware emulation and CloverGUI take care of a great amount of tasks to correct the internal tables and provide a possibility to run macOS.
Neither is it possible to boot macOS with the original DUET firmware emulation. It is not possible to boot macOS from the built-in UEFI. (U)EFI is not only present during the booting of an OS, but it also creates tables and services that are accessible to the OS, and the operability of the OS depends on the correct functionality of (U)EFI. Legacy boot is used for the last one, that is, the old BIOS system is used to handle boot sectors. An operating system (OS) may support (U)EFI (macOS, Windows 7, 8, or 10, Linux) or not (Windows XP).
#Bios custom boot path clover efi boot full
However, reality is different and achieving a full compatibility to all platforms is impossible.Ĭlover is an operating system boot loader for computers already equipped with an UEFI firmware and for those equipped with legacy BIOS firmware.
In contrast to BIOS based firmware that takes 64kb space and uses a 16-bit processor mode, (U)EFI is 32-bit or 64-bit, allows use of this full range of memory, and in theory positions itself as platform-independent. The (Unified) Extensible Firmware Interface or (U)EFI is a software interface between an operating system and the platform firmware.
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