From ArchWiki
Revision as of 15:41, 4 September 2013 by Dfe (Talk | contribs) (Installing changes)

Jump to: navigation, search

The link to documentation on freedesktop is currently giving a 503 and providing "guru meditation". Does anybody happen to be a guru and available to meditate on XID: 890648862? --cfr (talk) 03:22, 24 March 2013 (UTC)

Installing changes

This was recently added to the installation process.

# umount /sys/firmware/efi/efivars
# modprobe -r efivars
# modprobe efivarfs
# mount -t efivarfs efivarfs /sys/firmware/efi/efivars

Anyone care to explain what this is supposed to do and why it would be necessary? These commands look non-sense to me and I installed gummiboot on half a dozen machines without ever needing this. I mean, executing these commands doesn't actually change anything on the system, what am I missing? 65kid (talk) 15:46, 28 August 2013 (UTC)

@65kid: Refer Unified_Extensible_Firmware_Interface#Inconsistency_between_efivarfs_and_sysfs-efivars for more info. Keshav Padram Amburay (talk) 16:20, 28 August 2013 (UTC)

But UEFI#UEFI Variables Support in Kernel states: However since core/linux 3.10 efivarfs is built-in and efivars is again a separate module. So, aren't the above commands totally superfluous? -- Dfe (talk) 15:41, 4 September 2013 (UTC)

Mount /boot and efivarfs

Now systemd automatic detect ESP and mount it as /boot. Also systemd mount efivarfs. You no longer mount /boot manually or add entry in the /etc/fstab. If you try mount /boot manually or from /etc/fstab gummiboot install command will fail.


# findmnt /boot
/boot  systemd-1 autofs rw,relatime,fd=36,pgrp=1,timeout=300,minproto=5,maxproto=5,direct

# findmnt efivarfs
TARGET                    SOURCE   FSTYPE   OPTIONS
/sys/firmware/efi/efivars efivarfs efivarfs rw,nosuid,nodev,noexec,relatime

Please add this notes to the Article.

Unikum (talk) 05:44, 20 April 2013 (UTC)

". If you try mount /boot manually or from /etc/fstab gummiboot install command will fail." That's just not true, gummiboot install should work fine either way. What kind of error message is this supposed to cause?
Either way, I don't really like adding a note about the ESP automount yet for several reasons:
* the fsck is missing in the generated mount unit (this is on systemd's TODO list)
* it mounts /boot with 0700 permissions. Not sure if this is intended by upstream, but it is annoying and causes warnings from pacman.
* this feature isn't even documented in systemd yet
* This is a systemd feature, gummiboot just happens to be the only bootloader to export the EFI variables needed for this (for now). So it's probably debatable whether to put this on the systemd wiki or the gummiboot wiki.
65kid (talk) 07:51, 20 April 2013 (UTC)
Thanks for the explanation.
Unikum (talk) 11:54, 20 April 2013 (UTC)

LTS kernels

Although not strictly false, I think the page is a bit misleading because somebody might well think that gummiboot can boot the LTS kernel provided only that you add the EFI menu entry manually. But as far as I know the LTS kernels cannot be booted this way because they lack the stub loader. Obviously that doesn't mean you can't install gummiboot to do something else (boot another kernel, boot a boot loader etc.) but it is a bit odd the way it is put? --cfr (talk) 23:41, 23 July 2013 (UTC)