X370 Taichi, CSM menu disappeared from Boot tab

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   I have this problem as well. Did you ever figure out a solution?
I need to disable CSM so I can enable 4G decoding, but the CSM menu entry has disappeared   

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teamchris Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Dec 2020 Status: Offline Points: 1	Post Options Post Reply Quote teamchris Report Post Thanks(0) Quote Reply Topic: X370 Taichi, CSM menu disappeared from Boot tab Posted: 14 Dec 2020 at 7:11am
	I have this problem as well. Did you ever figure out a solution? I need to disable CSM so I can enable 4G decoding, but the CSM menu entry has disappeared

garych Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Dec 2017 Status: Offline Points: 62	Post Options Post Reply Quote garych Report Post Thanks(0) Quote Reply Posted: 25 Dec 2018 at 7:29am
	I'm aware of that, but it's not the problem I have. For some reason Above 4G decoding option sits inside the CSM menu, and after you enable Above 4G decoding the CSM menu itself is gone after reboot, therefore the Above 4G decoding option is also gone, so you have to clear CMOS in order to bring it back.

Isoceles Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Apr 2018 Status: Offline Points: 76	Post Options Post Reply Quote Isoceles Report Post Thanks(0) Quote Reply Posted: 23 Dec 2018 at 2:40pm
	This is supposed to happen, since it's not possible to use any legacy mode (CSM)features in 64bit mode. Unfortunately the ASRock firmware does not bother to explain this at all...

garych Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Dec 2017 Status: Offline Points: 62	Post Options Post Reply Quote garych Report Post Thanks(0) Quote Reply Posted: 23 Dec 2018 at 4:07am
	I've just installed P5.10 BIOS on X370 Taichi. After disabling CSM and enabling Above 4G decoding, which was in the same menu with CSM options, the CSM menu just vanished after rebooting.