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An option ROM for the PC platform (i.e. the IBM PC and derived successor computer systems) is a piece of firmware that resides in ROM on an expansion card (or stored along with the main system BIOS), which gets executed to initialize the device and (optionally) add support for the device to the BIOS.
When using a non-Apple keyboard, the alt key usually performs the same action. The boot manager can also be launched by holding down the "menu" button on the Apple Remote at startup. On older Macs, its functionality relies on BIOS emulation through EFI and a partition table information synchronization mechanism between GPT and MBR combined. [10]
UEFITool is a software program for reading and modifying EEPROM images with UEFI firmware. [1] It is written in C++ using the Qt library. [2] Features include the ability to view the flash regions and to extract and import them. [3] UEFITool allows the user to search for hex and text patterns. [4] UEFITool presents UEFI firmware images in a ...
That code has two primary responsibilities: to initialize system hardware and to load and run iBoot on the T2 chip. iBoot loads the bridgeOS operating system onto the T2 chip and starts it; bridgeOS loads the UEFI firmware into memory on the T2 chip, and starts the main Intel processor, which runs the UEFI firmware from the memory image on the ...
An unlocked bootloader, showing additional available options. Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware.
The top left corner has a key called NumLock, or number lock. To use alt key codes for keyboard shortcut symbols you’ll need to have this enabled. ... if there are some accents you’re using ...
On Apple Mac computers using Intel x86-64 processor architecture, the EFI system partition is initially left blank and unused for booting into macOS. [13] [14]However, the EFI system partition is used as a staging area for firmware updates [15] and for the Microsoft Windows bootloader for Mac computers configured to boot into a Windows partition using Boot Camp.
The Mac transition to Apple silicon marked a radical change in the POST process in Macs. Unlike most Intel-based Macs that use EFI-based firmware, these Apple silicon-based Macs uses a boot ROM that loads the Low-Level Bootloader (LLB), similar to that of the firmware found in the iPhone and iPad. Like Intel-based Macs with a T2 security chip ...