Intel to Remove Legacy BIOS Support from UEFI by 2020
 

The Basic Input/Output System (BIOS) will turn 45 in three years, and as it turns out, this is when it is going to die on 64-bit Intel platforms. In recent years, Intel has implemented its Unified Extensible Firmware Interface (UEFI) mechanism with legacy BIOS support as an additional option, however the company intends to remove legacy BIOS support from its UEFI by 2020 in an effort to improve security. For most users, the removal will go unnoticed, but for those who use and rely on legacy hardware on the newest platforms, it means migrating to other platforms.

https://www.anandtech.com/show/12068...m-uefi-by-2020