Intel Motherboards : CSM/MBR boot on Taichi

Author: parsec
Subject: CSM/MBR boot on Taichi
Posted: 11 Feb 2017 at 9:02am

claude.rivet wrote: Hello, I am trying to setup my BIOS for CSM/MBR booting rather than UEFI, it is required by Grub4dos and I need that bootloader. I cannot find where I can specify if boot is UEFI or CSM/MBR, anyone can help? Thanks, regards

Very simple answer. With CSM enabled (the default setting) you will get MBR formatting and booting, at least that is how it works in Windows. I don't think it will be any different with any version of Linux.

With CSM enabled, all the sub-options will be set to Legacy Only, which will cause MBR booting.

Setting CSM to disabled, or with CSM enabled, setting the Launch Storage OpROM policy to UEFI Only, causes GPT booting/formatting. The terms MBR and GPT are not mentioned, but I assure you that is how it works.

ASRock always set the default value of the CSM option to Enabled, and the CSM sub-options to Legacy Only. That always causes MBR formatting and booting, the default behavior when CSM is enabled.