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http://bkhome.org/news/201503/linux-kernel-3192-efi-enabled.html
[*] EFI-based framebuffer support [*] Simple frame buffer support Firmware drivers EFI support <*> EFI variable support via sysfs Filesystems Miscellaneous filesystems <M> EFI variable filesystem Kernel hacking [*] Early printk via the EFI frame buffer ...anyway, we shall see. The kernel source, with patches and build scripts, is here:
https://wiki.gentoo.org/wiki/Efibootmgr
Firmware Drivers ---> EFI (Extensible Firmware Interface) Support ---> <*> EFI Variable Support via sysfs Emerge. The sys-boot/efibootmgr package does not have any USE flags. All …
https://github.com/torvalds/linux/blob/master/drivers/firmware/efi/Kconfig
menu "EFI (Extensible Firmware Interface) Support" depends on EFI: config EFI_VARS: tristate "EFI Variable Support via sysfs" depends on EFI: default n: help: If you say Y here, you are able to get EFI (Extensible Firmware: Interface) variable information via sysfs. You may read, write, create, and destroy EFI variables through this interface.
https://vzimmer.blogspot.com/2012/12/accessing-uefi-form-operating-system.html
Dec 18, 2012 · The Linux sysfs is the closest but even there it doesn't expose each UEFI RT call point. The reason that the UEFI variable services are exposed in the fashion they are via Win32 calls is that OS installer programs have needed them since EFI1.02 back in 1999.Author: Vincent Zimmer
https://docs.slackware.com/howtos:slackware_admin:linux_kernel_options_for_uefi_and_elilo
Linux kernel options for UEFI and ELILO. The purpose of this article is to inform the user about necessary kernel options for booting from UEFI, and some info about how ELILO and perhaps other EFI bootloaders work, as this is currently difficult to find and understand online. ... EFI Variable Support via sysfs (CONFIG_EFI_VARS [=n])
https://customlinux.blogspot.com/2013/02/uefi-on-gentoo-with-grub2.html
UEFI on Gentoo w/ grub2 and GPT I did this on a new build (new hard drive) on a current slave system. So you can adapt the techniques a bit if you're doing this off a livecd or just migrating a current system. First you'll want to download a UEFI compatible livecd ( or make your own ).
https://blog.yangmame.org/Linux%E5%86%85%E6%A0%B8%E9%85%8D%E7%BD%AE%E6%8C%87%E5%8D%97-Firmware-Drivers%E5%92%8CFile-systems.html
[*] Export DMI identification via sysfs to userspace <*> DMI table support in sysfs. EFI (Extensible Firmware Interface) Support —> 选上<*> EFI Variable Support via sysfs即可 如果你是UEFI的话 其他选项根据你自己的硬件选择 但一般的配置就如上. File systems
https://stackoverflow.com/questions/40344484/cant-load-self-compiled-linux-kernel
"EFI Variable Support vis sysfs" is the legacy version. "File systems"->"Pseudo filesystems" -> "EFI Variable Filesystem" lacks some of the limitations of the pure sysfs interface (and the efivars library will use that in preference if available). – unixsmurf Mar 12 '17 at 11:22
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