Difference between revisions of "Boot loaders"

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[[Category:Boot loaders]]
#REDIRECT: [[:Category:Boot loaders]]
[[ja:Boot Loaders]]
The boot loader is the first piece of software started by the [[Wikipedia:BIOS|BIOS]] or [[UEFI]]. It is responsible for loading the kernel with the wanted [[kernel parameters]], and [[mkinitcpio|initial RAM disk]] before initiating the [[Arch Boot Process|boot process]]. You can use [[:Category:Boot loaders|different kinds]] of bootloaders in Arch, such as [[GRUB]] and [[Syslinux]]. Some bootloaders only support BIOS or UEFI and some support both.
This page will only contain a short introduction and the most used configurations that users will encounter. For detailed information, please see the corresponding pages of each boot loader.
== Both BIOS and UEFI Boot Loaders ==
=== GRUB ===
See [[GRUB]]
{{Note|About UEFI support: GRUB 2.x contains its own filesystem drivers and does not rely on the firmware to access the files. It can directly read files from {{ic|/boot}} and does not require the kernel and initramfs files to be in the UEFISYS partition. Detailed information at [[GRUB#UEFI_systems_2]]. For GIT development version try AUR package - {{AUR|grub-git}}}}
=== Syslinux ===
See [[Syslinux]]
== UEFI-only Boot Loaders ==
=== Linux Kernel EFISTUB ===
Follow [[EFISTUB]]
==== Gummiboot ====
Gummiboot is a UEFI Boot Manager (not a boot loader) which provides a menu for EFISTUB kernels. For more info follow [[Gummiboot]].
==== rEFInd ====
rEFInd is a UEFI Boot Manager which provides a menu for EFISTUB kernels. It is alternative to Gummiboot. For more info follow [[EFISTUB#Using_rEFInd|rEFInd]].
=== ELILO ===
ELILO is the UEFI version of LILO Boot Loader (although it does not share code with BIOS based [[LILO]] boot loader). It was originally created for Intel Itanium systems which supported only EFI 1.x (precursor to UEFI 2.x). It is the oldest UEFI bootloader for Linux. Elilo config file {{ic|elilo.conf}} is similar to [[LILO]]'s config file. ELILO does not support chainloading other EFI applications. and does not provide a menu by default (setting up requires additional configuration as described in {{ic|elilo/docs/textmenu_chooser.txt}} file. Upstream provided compiled binaries are available at http://sourceforge.net/projects/elilo/ and AUR package at {{AUR|elilo-efi}}.
{{Warning|1=ELILO upstream has clarified that it is no longer in active development, meaning no new features will be added and only bug-fixes are released. See https://sourceforge.net/mailarchive/message.php?msg_id=31524008 for more info. '''ELILO is not officially supported by Arch devs.'''}}
== BIOS-only Boot Loaders ==
=== GRUB Legacy ===
Follow [[GRUB Legacy]]
{{Note|GRUB Legacy (also known as grub-0.97) is not officially supported by Arch devs.}}
=== LILO ===
Follow [[LILO]]
{{Note|LILO is not officially supported by Arch devs, although it seems to be actively developed.}}
=== NeoGRUB ===
[[NeoGRUB]] provides a means to boot Arch from the Windows Bootloader without installing a bootloader on the Arch itself. It is provided by the EasyBCD tool running on Windows. This is a great option for dual-booting Windows and Arch, especially if you find that Windows has trouble when booted or chainloaded from Syslinux or GRUB.
Booting Arch from NeoGRUB has not been tested yet from Windows 8 and/or UEFI systems.
{{Note|NeoGRUB is not officially supported by Arch devs.}}
== Troubleshooting ==
=== UEFI Boot Loader does not show up in firmware menu ===
On some UEFI motherboards like boards with an Intel Z77 chipset, adding entries with {{ic|efibootmgr}} or {{ic|bcfg}} from the EFI Shell will not work because they don't show up on the boot menu list after being added to NVRAM.
This issue is caused because the motherboards can only load Microsoft Windows. To solve this you have to place the {{ic|.efi}} file in the location that Windows uses.
Copy the {{ic|bootx64.efi}} file from the Arch Linux installation medium ({{ic|FSO:}}) to the Microsoft directory your ESP partition on your hard drive ({{ic|FS1:}}). Do this by booting into EFI shell and typing:
cd EFI
mkdir Microsoft
cd Microsoft
mkdir Boot
cp FS0:\EFI\BOOT\bootx64.efi FS1:\EFI\Microsoft\Boot\bootmgfw.efi
After reboot, any entries added to NVRAM should show up in the boot menu.
== See also ==
* [http://www.rodsbooks.com/efi-bootloaders/ Rod Smith - Managing EFI Boot Loaders for Linux]
* [http://www.rodsbooks.com/refind/ Rod Smith - rEFInd, a fork or rEFIt]
* [https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob_plain;f=Documentation/x86/efi-stub.txt;hb=HEAD Linux Kernel Documentation on EFISTUB]
* [http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=291f36325f9f252bd76ef5f603995f37e453fc60;hp=55839d515495e766605d7aaabd9c2758370a8d27 Linux Kernel EFISTUB Git Commit]
* [http://www.rodsbooks.com/efi-bootloaders/efistub.html Rod Smith's page on EFISTUB]
* [http://www.rodsbooks.com/refind/linux.html rEFInd Documentation for booting EFISTUB Kernels]

Latest revision as of 10:02, 6 July 2016