Understanding UEFI and Its Recognition of Linux as a Valid OS

The Unified Extensible Firmware Interface (UEFI) has recognized Linux as a valid operating system since 2006 with the release of UEFI 2.0. Most modern UEFI firmware implementations support Linux, enabling it to boot alongside other operating systems.

Factors Influencing Booting Linux on UEFI Systems

However, the ability to boot Linux on UEFI systems can depend on several factors:

Secure Boot: Many UEFI implementations include a Secure Boot feature that prevents unsigned operating systems from booting. While this can be a concern, most major Linux distributions such as Ubuntu and Fedora have made efforts to support Secure Boot by signing their kernels. Compatibility: Some older hardware may have UEFI implementations that are less compatible with Linux. However, with ongoing improvements in Linux support, this concern is becoming less significant.

UEFI and the EFI Header

UEFI itself does not recognize any particular operating systems; it can run any kernel or bootloader with an EFI header. Some implementations may require that the reported OS name be "Windows Boot Manager" due to a defect in implementation, but this is not a part of the standard.

UEFI as an Industry Standard

UEFI is an industry standard governed by the Unified Extensible Firmware Interface Forum. UEFI includes a Certificate Authority (CA) that signs secure images from any vendor, eliminating vendor lockout. Additionally, the UEFI specification allows for the enrollment of keys beyond just the UEFI CA.

UEFI and Linux

UEFI defines a software interface for OS loaders and Option ROMs to communicate with the system firmware. While the UEFI specification does not define user interfaces or platform policies, it allows flexibility through vendor choice. Consequently, UEFI supports Linux, and there is even open-source code that implements UEFI secure boot in firmware and Linux.

Conclusion

In conclusion, UEFI does recognize Linux and the platform policies are determined by the vendor. With the right distribution and adherence to installation guidelines, Linux installation on UEFI systems is typically smooth and hassle-free.