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X370 Taichi, CSM menu disappeared from Boot tab

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garych View Drop Down
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    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.
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Isoceles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Isoceles Quote  Post ReplyReply Direct Link To This Post 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...
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garych View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote garych Quote  Post ReplyReply Direct Link To This Post 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.
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teamchris View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote teamchris Quote  Post ReplyReply Direct Link To This Post 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
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