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mauricev
Apprentice
Joined: 22 Mar 2004
Posts: 202
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 Posted: Sun Jan 03, 2021 5:01 am Post subject: How can my machine be magically switching from UEFI to BIOS? |
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Setup an UDOO Bolt to boot up with in default UEFI mode. Set up partitions as follows
| Code: | Disklabel type: gpt
Disk identifier: 08291972-7D75-4AD4-AACB-6D5F87F6E9C7
Device Start End Sectors Size Type
/dev/nvme0n1p1 2048 1050623 1048576 512M EFI System
/dev/nvme0n1p2 1050624 7342079 6291456 3G Linux swap
/dev/nvme0n1p3 7342080 250067632 242725553 115.7G Solaris /usr & Apple ZFS |
Grub was installed as follows in a chrooted environment
| Code: | | grub-install --efi-directory=/boot/efi |
The executable grubx64.efi sits in /boot/efi.
But when I boot up and check dmesg for efi, I get
| Code: | dmesg| grep efi
[ 0.024473] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
[ 2.016564] tsc: Refined TSC clocksource calibration: 1996.245 MHz |
Similarly, ls of /sys/firmware lists the following directories
| Code: | | acpi memmap qemu_fw_cfg |
efi should be there, but it isn't. It appears as if the machine somehow decided to boot BIOS style and not UEFI.
However, if I remove grubx64.efi, the system just loops into the BIOS setup screen and can't boot confirming it's executing this file to boot, so how can it do this? |
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mauricev
Apprentice
Joined: 22 Mar 2004
Posts: 202
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| Posted: Sun Jan 03, 2021 6:18 am Post subject: |
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| My system was, in fact, booting with UEFI all along. I am using a custom kernel and I had the EFI related configuration disabled. Once I enabled it, EFI is now showing up in dmesg and in /sys/firmware. |
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Installing Gentoo
