Windows 11 installation/compatibility

ASRock's tech support department has reached out to me and asked me to share some
information about Windows 11, how to upgrade and compatibility:

https://asrock.com/support/faq.asp?k=500. This will show a list of chipsets and CPU's that are supported But there are some conditions 1.       Windows 10 must be installed in GPT (UEFI) Mode 2.       CSM must be Disabled 3.       And TPM must be activated When people have MBR formatted drives, they can google for mbr2gpt, there is a Microsoft tool for it (of course after making backups) If that is all done, the upgrade should go fine. Unsupported hardware: For people who have older hardware, an upgrade is not possible, it will stop at the hardware checks, and that is it. But, a clean installation is in many cases possible (We have already had some customers with 970 Pro3, Z87 and Z97 boards successfully upgrade). They just have to disable CSM, and install in GPT mode.

What I do not understand, what is CSM? What is Dap, and where do I find them in the BIOS>

Thank you for the information about the hardware requirements and conditions for upgrading to Windows 10 in GPT (UEFI) mode.

It's good to know that people with MBR formatted drives can use the mbr2gpt tool to convert their drives before upgrading, and that disabling CSM and activating TPM are also necessary steps.
Overall, it's important for people to make sure their hardware meets the necessary requirements before attempting an upgrade or clean installation of Windows 10 in GPT (UEFI) mode.