problems with /sys/firmware/efi/efivars being empty [SOLVED]

[bammbamm808]

New motherboard: CSM is off in bios. Windows installed and runs in UEFI mode just fine. Gentoo install still exists, with a known-good efi partition and everything. As a matter of fact, Windows is using this partition for its own boot loader. I went to add rEFInd to EFI boot list with efibootmgr using the latest min install cd on a usb boot drive. Found I could not remount my /sys/firmware/efi/efivars rw. /sys/firmware/efi/efivars exists outside the chroot, but is empty even after loading the efivars module. I guess this is due to the changes in 5.15. Any pointers appreciated.

[alamahant]

Plz try in livecd

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umount efivarfs
mount -t efivarfs efivarfs /sys/firmware/efi/efivars

Do you see it populated?

[Tony0945]

So is mine but I have no trouble booting:

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MSI ~ # ls /sys/firmware
acpi  dmi  efi  memmap
MSI ~ # ls /sys/firmware/efi
config_table  esrt              fw_vendor  runtime-map  vars
efivars       fw_platform_size  runtime    systab
MSI ~ # ls /sys/firmware/efi/efivars
MSI ~ # ls /sys/firmware/efi/efivars -al
total 0
dr-xr-xr-x 2 root root 0 Jan  4 05:42 .
drwxr-xr-x 6 root root 0 Jan  4 05:42 ..

[Anon-E-moose]

From my .config (everything selected *EFI*)

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CONFIG_EFI=y
CONFIG_EFI_STUB=y
CONFIG_EFI_PARTITION=y
CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK=y
CONFIG_EFI_VARS=m
CONFIG_EFI_ESRT=y
CONFIG_EFI_RUNTIME_WRAPPERS=y
CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER=y
CONFIG_EFIVAR_FS=m

Note: EFI_VARS and EFIVAR_FS are selected as modules, but it will only use one, EFIVAR_FS is the preferred (newer) version, but I selected both anyway.

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$ dir /sys/firmware/efi/
total 0
drwxr-xr-x 4 root root    0 Dec 30 00:36 .
drwxr-xr-x 6 root root    0 Dec 30 00:36 ..
-r--r--r-- 1 root root 4.0K Jan  8 06:24 config_table
drwxr-xr-x 2 root root    0 Dec 30 00:36 efivars
drwxr-xr-x 3 root root    0 Jan  8 06:24 esrt
-r--r--r-- 1 root root 4.0K Jan  8 06:24 fw_platform_size
-r--r--r-- 1 root root 4.0K Jan  8 06:24 fw_vendor
-r--r--r-- 1 root root 4.0K Jan  8 06:24 runtime
-r-------- 1 root root 4.0K Jan  8 06:24 systab

Both efivars and esrt have files under them.

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$ dir /sys/firmware/efi/efivars/|head
total 0
drwxr-xr-x 2 root root    0 Dec 30 00:36 .
drwxr-xr-x 4 root root    0 Dec 30 00:36 ..
-rw-r--r-- 1 root root  132 Dec 30 00:36 AMD_PBS_SETUP-a339d746-f678-49b3-9fc7-54ce0f9df226
-rw-r--r-- 1 root root   12 Dec 30 00:36 AMD_RAID-fe26a894-d199-47d4-8afa-070e3d54ba86
-rw-r--r-- 1 root root   28 Dec 30 00:36 AMITCGPPIVAR-a8a2093b-fefa-43c1-8e62-ce526847265e
-rw-r--r-- 1 root root 1.1K Dec 30 00:36 AOD_SETUP-5ed15dc0-edef-4161-9151-6014c4cc630c
-rw-r--r-- 1 root root   14 Dec 30 00:36 AmdAcpiVar-79941ecd-ed36-49d0-8124-e4c31ac75cd4
-rw-r--r-- 1 root root 1.6K Dec 30 00:36 AmdSetup-3a997502-647a-4c82-998e-52ef9486a247
-rw-r--r-- 1 root root    8 Dec 30 00:36 AmiHardwareSignatureSetupUpdateCountVar-81c76078-bfde-4368-9790-570914c01a65
...

[bammbamm808]

Just so happens that when fiddling in my new motherboard's bios late one night, I inadverdantly flipped the NX bit off. Thanks for all who tried to help.