The Good, the Bad, and the Ugly. Originally written 61. This Web page is provided free of charge and with no annoying. I did take time to prepare it, and Web hosting does. If you find this Web page useful, please consider making a. Thanks Donate 1. Donate 2. 5. 0Donate 5. Donate 1. 0. 0. 0Donate another value. This page is part of my Managing EFI Boot Loaders. Linux document. If a Web search has brought you to this page, you. Most modern Extensible Firmware Interfaces EFIs and Unified EFIs UEFIs include a feature called the Compatibility Support Module CSM. This feature enables an EFI based computer to use BIOS mode boot loaders, much like WINE enables Linux to run Windows binaries. CSM is often activated in the firmware setup utility by enabling a feature called legacy mode. Thus, three names BIOS, CSM, and legacy may refer to the same thing. Although CSM sounds like a wonderful feature, it has some serious drawbacks, as this document explains. If you must use it, you should understand how to make best use of it on your computer. Before delving into the main points of this page, Id like to address some common misconceptions. First, an EFI is not a BIOS. Many people even manufacturers refer to EFIs as BIOSes, but this nomenclature encourages thinking of EFIs in BIOS terms, as if an EFI were a simple add on to a BIOS. An EFI is a fundamentally new type of firmware, though, and if you think of it in BIOS terms, youre likely to apply a lot of BIOS assumptions to EFI that are flat out wrong. Related to this is the way the CSM interacts with the EFI.
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