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#1 2019-11-02 19:41:43

madpet
Member
Registered: 2018-06-21
Posts: 16

[SOLVED] UEFI motherboard and all, but Arch claims no EFI

So, I have gotten this new PC, which has three drives:
- A 220 GB SSD w/ Windows on it
- A 1TB HDD that I install games on
- A 500GB HDD that I want to install Arch on to dualboot

However, when I boot from my installation media (USB stick) with Arch, it doesn't boot into the 'EFI-compatible' mode (i.e. there is no /sys/firmware/efi/efivars), but the Motherboard is a new ASUS PRIME B365M-K, which supports UEFI and Windows also claims that the BIOS is indeed EFI.

I know I could probably just continue with the old-fashioned BIOS install way, but this is a brand new computer and I'd like to install with EFI if at all possible. Is it something that I have to 'activate' somewhere in the BIOS or something? I know it can use EFI, so I have no idea why Arch claims it doesn't :S

Last edited by madpet (2019-11-03 19:52:03)

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#2 2019-11-02 19:46:08

loqs
Member
Registered: 2014-03-06
Posts: 9,077

Re: [SOLVED] UEFI motherboard and all, but Arch claims no EFI

Is secure boot is disabled in the firmware?

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#3 2019-11-02 23:05:10

madpet
Member
Registered: 2018-06-21
Posts: 16

Re: [SOLVED] UEFI motherboard and all, but Arch claims no EFI

loqs wrote:

Is secure boot is disabled in the firmware?

No, not currently.

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#4 2019-11-03 06:26:20

adenosine
Member
Registered: 2017-12-06
Posts: 9

Re: [SOLVED] UEFI motherboard and all, but Arch claims no EFI

I had a similar problem on my computer, but I was able to get it working.

Does your bios have an option to boot an EFI recovery shell from a USB stick or similar? If you can do that, then as long as you have your EFI partition set up correctly, you can just chainload an EFI bootloader for linux and fix everything with efibootmgr from there.

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#5 2019-11-03 13:33:57

loqs
Member
Registered: 2014-03-06
Posts: 9,077

Re: [SOLVED] UEFI motherboard and all, but Arch claims no EFI

madpet wrote:
loqs wrote:

Is secure boot is disabled in the firmware?

No, not currently.

Please see the note from Secure_Boot#Booting_an_install_media

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#6 2019-11-03 19:51:52

madpet
Member
Registered: 2018-06-21
Posts: 16

Re: [SOLVED] UEFI motherboard and all, but Arch claims no EFI

loqs wrote:
madpet wrote:
loqs wrote:

Is secure boot is disabled in the firmware?

No, not currently.

Please see the note from Secure_Boot#Booting_an_install_media

That solved the problem! After disabling Secure Boot in the BIOS, I am able to boot the installation media as EFI. Thank you!

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