UEFI (Unified extensible firmware interface) has been replacing traditional BIOS for quite a long time. The intuitive way to distinguish the two is to see whether there is a mouse button in the interface, of course, there are still many differences between the bottom.
From the operating system level, after Windows 8 began to support the complete UEFI, the previous system including Win7 64bit is not the case.
So, in a lot of pre installed Win8 or more computers,If you want to install Win7 or even XP, you need to modify the two settings of CSM (Compatibility Support Module, compatible support module) and Secure Boot (security boot) in UEFI to enable Legacy compatibility mode.
However, Intel researcher Brian Richardson disclosed a decision on Intel in the UEFI Plugfest event in Taiwan,Support for UEFI BIOS compatibility from three levels of support of 0, 1 and 2 will be supported from 2020That is, the CSM cannot be started to start the operating system.
The above three levels allow Win7 and many previous unsupported or incomplete support for the normal operation of the UEFI operating system, because the 16bit network, VGA, hard disk and so on can not pass through, and Class 3/3 instead of mandatory, that is, removed the Legacy.
Richardson himself is very sympathetic to this change. As a technician, he thinks the system will be safer, hardware will be more stable, and firmware packages will be much smaller.
Of course, for ordinary users,After updating the new platform or the old platform to the corresponding BIOS, the installation of the system before including Win7 64biti has become a luxury.
1. CSM (Compatibility Support Module): compatible support module.
Many computers built before Win 8 use UEFI architecture to reduce costs and standardize firmware stacks, but are still used in BIOS mode to maintain compatibility with existing processing processes, tools, old operating systems, drivers, and some applications.
2. Secure Boot (safe start):
Win8 hardware equipment all default using UEFI (Unified extensible firmware interface (Secure) security startup Boot), prevent unauthorized boot loader (OS Loader) start at BIOS, UEFI to start the certification through the boot loader, and malicious software is unable to use this method to attack the user.