Intel wants to end BIOS support in 2020, removing the CSM module from UEFIs, which will simplify and reduce the computer boot process and allow for other enhancements.

A few years ago, the BIOS stopped being that blue screen with white letters and is a simpler, more comfortable panel that allows you to move more fluidly with the keyboard and mouse. Although we have come to call it UEFI BIOS, really and technically only the term UEFI is used. The term BIOS is maintained because there is backward compatibility to run systems older than 2010, when UEFI began to be implemented. Intel wants to end BIOS support for older computers and this will happen next 2020.

Intel plans to remove the CSM compatibility module from within the UEFI, which will be renamed 'Class 3'. Keeping the BIOS, as we know it, is due to 32-bit devices, something that will prevent the aforementioned devices from working correctly, such as graphics cards, as long as these devices do not have a firmware compatible with the UEFI. Not only will it affect graphics cards, but older devices such as 16-bit devices, which can be found in storage drives and network cards, will also stop working.

This has something positive. Suppressing BIOS support in UEFIs reduces the size of the code, thus reducing the size of the UEFI and thus reducing the process of validation and verification of components when the system boots. Intel not only proposes this change, it would be developing what will be known as UEFI 'Class 3+', which would have a secure boot system enabled. This deletion of CSM will not only affect home users, it will also affect data centers, servers and professional computers.

Source: TPU