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Intel is working on a plan to remove so-called "last-mile" barriers to killing off legacy BIOS by requiring UEFI Class 3, which doesn't expose legacy BIOS interfaces.
BIOS is the firmware that helped older PCs boot up after powering on and offered a runtime for the operating system and software.
Today's computers come with UEFI or the Unified Extensible Firmware Interface, but have included BIOS support for cases where people use software that depends on 16-bit BIOS, which can be enabled though the Compatibility Support Module (CSM).
Intel technical marketing engineer Brian Richardson revealed in a recent presentation that the company will require UEFI Class 3 and above. It will remove legacy BIOS support from its client and datacenter platforms by 2020.
By enforcing UEFI Class 3 it will "break" any customer process that depends on disabling UEFI through CSM.
However, as noted by Liliputing, Intel isn't making Secure Boot mandatory, which means users should still be able to run unsigned Linux distributions on PCs with UEFI. However, users won't be able to sidestep compatibility issues using CSM on Intel-based PCs.
Richardson notes that Intel wants to "eliminate components with no UEFI support" by ensuring that drivers, peripherals and utilities work without CSM.
It also will be working with industry partners to improve the user experience of UEFI Secure Boot, ensuring that they validate their tools with Secure Boot on, so that end-users don't need to enable CSM to resolve recovery issues.
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