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1. What exactly is UEFI
2. Driving factors of the UEFI revolution

2. Driving factors of the UEFI revolution

1. What exactly is UEFI
2. Driving factors of the UEFI evolution

2. Driving factors of the UEFI evolution

Here's the reality

Note: I will provide you with some resources to help clarify so you're not just taking my word on it, take the word of the major computer manufactures and whatever they agree upon instead.

My opinion is that when you get most of the major computer manufactures on board and agree to use a next-generation type technology to replace an outdated and insufficient technology that cannot keep up with the configuration demands as technology changes and improves, then it is safe to assume BIOS is legacy and is an outdated technology.

specification that defines a software interface between an operating system and platform firmware. UEFI replaces the Basic Input/Output System (BIOS) firmware interface originally present in all IBM PC-compatible personal computers,[1][2] with most UEFI firmware implementations providing legacy support for BIOS services. UEFI can support remote diagnostics and repair of computers, even with no operating system installed.

Source

What exactly is UEFI

UEFI is firmware for computers developed and published by Intel. Unlike most BIOS firmware, UEFI firmware can be found on systems which are not in the IBM PC compatible class.

Note: Newer PCs that ship with UEFI still refer to it as the “BIOS” to avoid confusing people who are used to a traditional PC BIOS. Even if your PC uses the term “BIOS”, modern PCs you buy today almost certainly ship with UEFI firmware instead of a BIOS.

_source

Extensible Firmware

UEFI is an extension of firmware like BIOS but ⁽¹⁾it can read from entries from disk partitions by not just booting from a disk but ⁽²⁾booting from a specific boot loader in a specific location on a specific disk.

Bootloader Compatibility for Execution by UEFI

The UEFI spec defines the executable format requiring all UEFI firmwares to be capable of executing code in that format. When a bootloader is written for native UEFI, it is written in this format.

Backwards Compatible

For backward compatibility, most UEFI firmware can boot a system just like BIOS firmware and look for a MBR and run the boot loader from there as well. Depending on the firmware this may be called BIOS legacy mode, BIOS compatibility mode, or other similar terms.

Note: UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface, present in all IBM PC-compatible personal computers. In practice, most UEFI images provide legacy support for BIOS services.

_source

Yes, UEFI is intended to replace its legacy BIOS counterpart. You only need to understand a few things to confirm this. I've listed some main points with references and snippets of related facts.

1. What exactly is UEFI
2. Driving factors of the UEFI revolution

1. What exactly is UEFI

UEFI is firmware for computers developed and published by Intel. Unlike most BIOS firmware, UEFI firmware can be found on systems which are not in the IBM PC compatible class.

Note: Newer PCs that ship with UEFI still refer to it as the “BIOS” to avoid confusing people who are used to a traditional PC BIOS. Even if your PC uses the term “BIOS”, modern PCs you buy today almost certainly ship with UEFI firmware instead of a BIOS.

_source

Extensible Firmware

UEFI is an extension of firmware like BIOS but ⁽¹⁾it can read from entries from disk partitions by not just booting from a disk but ⁽²⁾booting from a specific boot loader in a specific location on a specific disk.

Bootloader Compatibility for Execution by UEFI

The UEFI spec defines the executable format requiring all UEFI firmwares to be capable of executing code in that format. When a bootloader is written for native UEFI, it is written in this format.

Backwards Compatible

For backward compatibility, most UEFI firmware can boot a system just like BIOS firmware and look for a MBR and run the boot loader from there as well. Depending on the firmware this may be called BIOS legacy mode, BIOS compatibility mode, or other similar terms.

Note: UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface, present in all IBM PC-compatible personal computers. In practice, most UEFI images provide legacy support for BIOS services.

_source

2. Driving factors of the UEFI revolution

Note: Here are some resources to help clarify and confirm what major computer manufactures agree upon collectively to use and develop as an industry standard for the market share which they help influence.

I think when most of the major computer manufactures are on board and agree to use a next-generation type technology to replace an outdated and insufficient technology that cannot keep up with the configuration demands as technology changes and improves, then it is safe to "assume" BIOS is legacy and is an outdated technology without a ton of additional research and analysis.

specification that defines a software interface between an operating system and platform firmware. UEFI replaces the Basic Input/Output System (BIOS) firmware interface originally present in all IBM PC-compatible personal computers,[1][2] with most UEFI firmware implementations providing legacy support for BIOS services. UEFI can support remote diagnostics and repair of computers, even with no operating system installed.

Source

Here's some additional detail

What exactly is UEFI