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Firmware is the read-only-memory (ROM)-based software that controls a computer between the time it is turned on and the time the primary operating system takes control of the machine. Open Firmware provides the following: a mechanism for loading and executing programs (such as operating systems) from disks, tapes, network interfaces, and other devices; an ISA-independent method for identifying devices "plugged in" to expansion buses and for providing firmware and diagnostics drivers for these devices; an extensible and programmable command language based on the Forth programming language; methods for managing user-configurable options stored in nonvolatile memory; a "call back" interface allowing other programs to make use of Open Firmware services; and debugging tools for hardware, firmware, firmware drivers, and system software.

Computer firmware. --- Firmware, Computer --- Computer programs

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System Design --- Microprogramming --- Computer firmware

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Computer firmware --- Microprocessors --- Microprogramming --- Congresses --- Congresses

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This book provides an overview of modern boot firmware, including the Unified Extensible Firmware Interface (UEFI) and its associated EFI Developer Kit II (EDKII) firmware. The authors have each made significant contributions to developments in these areas. The reader will learn to use the latest developments in UEFI on modern hardware, including open source firmware and open hardware designs. The book begins with an exploration of interfaces exposed to higher-level software and operating systems, and commences to the left of the boot timeline, describing the flow of typical systems, beginning with the machine restart event. Software engineers working with UEFI will benefit greatly from this book, while specific sections of the book address topics relevant for a general audience: system architects, pre-operating-system application developers, operating system vendors (loader, kernel), independent hardware vendors (such as for plug-in adapters), and developers of end-user applications. As a secondary audience, project technical leaders or managers may be interested in this book to get a feel for what their engineers are doing. The reader will find: An overview of UEFI and underlying Platform Initialization (PI) specifications How to create UEFI applications and drivers Workflow to design the firmware solution for a modern platform Advanced usages of UEFI firmware for security and manageability

Computer firmware. --- Open source software. --- Free software (Open source software) --- Open code software --- Opensource software --- Computer software --- Firmware, Computer --- Computer programs --- BIOS. --- Boot. --- EFI. --- Firmware. --- Registry. --- UEFI. --- Unified Extensible Firmware Interface.

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Applications programs (computers) --- C (programming language) --- Controllers. --- Firmware. --- Configuration management.