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Francois1
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PostPosted: Fri Mar 04, 2016 10:37 am    Post subject: UEFI install desperation Reply with quote

Hello,

since a couple of days I am trying to figure out how to install Gentoo on a laptop with UEFI. I have read the handbook very many times, and found it not easy to understand (in fact, I failed to understand) important parts, number one being installation to boot in UEFI mode. When I boot, I get a black screen, nothing else. I am using grub2 as boot manager.

I am wondering where the efivars come into place? The installation iso boots in mbr mode, should I install them, or activate in the kernel? Don't know what to do.
Quote:
From the HANDBOOK
efibootmgr is not a requirement to boot from an UEFI system. The Linux kernel itself can (and will) be booted immediately, and additional boot options can be made part of the Linux kernel itself (there is a kernel configuration that allows the user to specify the boot parameters). Even an initramfs can be made part of the kernel itself.
So what? I remember I read somewhere that efibootmgr is a requirement for correct Grub installation for UEFI. I am lost.

This is my setting:
Code:
partitioning
/dev/sdX1 ef00,esp formated as Fat32
/dev/sdX2 formated as ext4

/dev/sdX1 is mounted to /boot, so I guess it is my ESP.
/boot/grub/grub.cfg
Code:
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
 load_env
fi
if [ "${next_entry}" ] ; then
  set default="${next_entry}"
  set next_entry=
  save_env next_entry
  set boot_once=true
else
  set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
 menuentry_id_option="--id"
else
 menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
 set saved_entry="${prev_saved_entry}"
 save_env saved_entry
 set prev_saved_entry=
 save_env prev_saved_entry
 set boot_once=true
fi

function savedefault {
 if [ -z "${boot_once}" ]; then
   saved_entry="${chosen}"
   save_env saved_entry
 fi
}

function load_video {
 if [ x$feature_all_video_module = xy ]; then
   insmod all_video
 else
   insmod efi_gop
   insmod efi_uga
   insmod ieee1275_fb
   insmod vbe
   insmod vga
   insmod video_bochs
   insmod video_cirrus
 fi
}

if [ x$feature_default_font_path = xy ] ; then
  font=unicode
else
insmod part_gpt
insmod ext2
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2  g4374732-43z3-662d-g7420876250g
else
 search --no-floppy --fs-uuid --set=root g4374732-43z3-662d-g7420876250g
fi
   font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
 set gfxmode=auto
 load_video
 insmod gfxterm
fi
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
 set timeout_style=menu
 set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
 set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-01f933f1-4
a79-4cc1-b1e1-c8753898682d' {
       load_video
       if [ "x$grub_platform" = xefi ]; then
               set gfxpayload=keep
       fi
       insmod gzio
       insmod part_gpt
       insmod fat
       set root='hd0,gpt1'
       if [ x$feature_platform_search_hint = xy ]; then
         search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1  73V6-GR73
       else
         search --no-floppy --fs-uuid --set=root 73V6-GR73
       fi
       echo    'Loading Linux x86_64-4.1.15-gentoo-r1 ...'
       linux   /kernel-genkernel-x86_64-4.1.15-gentoo-r1 root=UUID=g4374732-43z3-662d-g7420876250g ro   
       echo    'Loading initial ramdisk ...'
       initrd  /initramfs-genkernel-x86_64-4.1.15-gentoo-r1
}
submenu 'Advanced options for Gentoo GNU/Linux' $menuentry_id_option 'gnulinux-advanced-g4374732-43z3-662d-g7420876250g' {
       menuentry 'Gentoo GNU/Linux, with Linux x86_64-4.1.15-gentoo-r1' --class gentoo --class gnu-linux --class gnu --class os $men
uentry_id_option 'gnulinux-x86_64-4.1.15-gentoo-r1-advanced-g4374732-43z3-662d-g7420876250g' {
               load_video
               if [ "x$grub_platform" = xefi ]; then
                       set gfxpayload=keep
               fi
               insmod gzio
               insmod part_gpt
               insmod fat
               set root='hd0,gpt1'
               if [ x$feature_platform_search_hint = xy ]; then
                 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1   73V6-GR73
               else
                 search --no-floppy --fs-uuid --set=root 73V6-GR73
               fi
               echo    'Loading Linux x86_64-4.1.15-gentoo-r1 ...'
               linux   /kernel-genkernel-x86_64-4.1.15-gentoo-r1 root=UUID=g4374732-43z3-662d-g7420876250g ro   
               echo    'Loading initial ramdisk ...'
               initrd  /initramfs-genkernel-x86_64-4.1.15-gentoo-r1
       }
       menuentry 'Gentoo GNU/Linux, with Linux x86_64-4.1.15-gentoo-r1 (recovery mode)' --class gentoo --class gnu-linux --class gnu
--class os $menuentry_id_option 'gnulinux-x86_64-4.1.15-gentoo-r1-recovery-g4374732-43z3-662d-g7420876250g' {
               load_video
               if [ "x$grub_platform" = xefi ]; then
                       set gfxpayload=keep
               fi
               insmod gzio
               insmod part_gpt
               insmod fat
               set root='hd0,gpt1'
               if [ x$feature_platform_search_hint = xy ]; then
                 search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt1 --hint-efi=hd0,gpt1 --hint-baremetal=ahci0,gpt1   73V6-GR73
               else
                 search --no-floppy --fs-uuid --set=root 73V6-GR73
               fi
               echo    'Loading Linux x86_64-4.1.15-gentoo-r1 ...'
               linux   /kernel-genkernel-x86_64-4.1.15-gentoo-r1 root=UUID=g4374732-43z3-662d-g7420876250g ro single  
               echo    'Loading initial ramdisk ...'
               initrd  /initramfs-genkernel-x86_64-4.1.15-gentoo-r1
       }
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
 source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
 source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###


Code:
ls -l /dev/disk/by-uuid
lrwxrwxrwx 1 root root 10 Mar  4 09:30  73V6-GR73 -> ../../sda1
lrwxrwxrwx 1 root root 10 Mar  4 09:30  01f933f1-4a79-4cc1-b1e1-c8753898682d -> ../../sda2


Hope that someone can help me.

Francois
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Francois1
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PostPosted: Fri Mar 04, 2016 12:07 pm    Post subject: Reply with quote

I would like to supply also my kernel config file using wgetpaste.
Is
Code:
wgetpaste /usr/src/linux/.config
all that is needed?

Francois

EDIT: got it.
Here is the output of emerge --info https://bpaste.net/show/64547abbe204

And /usr/src/linux/.config is here: https://bpaste.net/show/8fd3bd7c1b6e

Hope someone knows what to do....
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Buffoon
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PostPosted: Fri Mar 04, 2016 1:08 pm    Post subject: Reply with quote

I'm in the same boat. Just recently I managed to set up my first EFI boot, using EFI stub kernel. Now I have a machine here that boots in MBR mode, but only once. Every time I boot it I have to go into setup and set MBR boot. I'm trying to get EFI working on this machine, but it will not boot in EFI mode, it does not see my ESP with kernel on it.

To set efivars you must boot in EFI mode ...
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khayyam
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PostPosted: Fri Mar 04, 2016 1:43 pm    Post subject: Reply with quote

Francois1 ...

to be able to run efibootmgr (or grub-install ... which effectively does the same) you should use a boot disk that supports efivars, sysresccd would be a good choice (gentoo based).

best ... khay
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saellaven
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PostPosted: Fri Mar 04, 2016 1:47 pm    Post subject: Reply with quote

When I was setting up my first EFI boot a couple weeks ago, a couple sites I came across said grub was unreliable for EFI booting. I can't speak to that since I don't use and never liked grub to begin with. I used sys-boot/refind instead

Also, keep in mind that, with EFI booting, at least with the stub, you can't pass the kernel arguments on the command line and have to build them in. You may also need to disable Secure Boot in your BIOS.

You can see my post here about what settings finally worked for me.
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Francois1
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PostPosted: Fri Mar 04, 2016 2:37 pm    Post subject: Reply with quote

khayyam wrote:
to be able to run efibootmgr [...] you should use a boot disk that supports efivars, sysresccd would be a good choice (gentoo based).

That's what I've seen with other distros, but the Gentoo UEFI Wiki states it is covered by the handbook, and there is no mentioning of the need to use an efi-booted installation medium there.
Anyway, I will try that over the weekend.

Thanks,
Francois
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Francois1
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PostPosted: Fri Mar 04, 2016 2:41 pm    Post subject: Reply with quote

@saellaven
thanks for the instructions, I shall give it a try over the weekend. Somehow I am glad to see that I am not the only one having problems with this. EFI is not that new, would be nice to have an elaborated wiki on that.

Francois
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axl
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PostPosted: Tue Mar 15, 2016 1:29 am    Post subject: Reply with quote

i know it's not a gentoo kind of solution to suggest. but it works. so it's gentoo in my book.

i am using a ga-x99-ud4p. in bios i force it to boot usb sticks as hdd (tab4/5 i think), and as uefi first.

the stick. i downloaded ubuntu curent install iso. it has both uefi support and nvme support which i craved from gentoo.

dd if=iso of=stick. make sure u boot in uefi mode. that means that should be some "efi" directory in /sys. i think...

next: mkdir /mnt/gentoo; for a in dev proc sys; do mount -o bine /$a /mnt/gentoo/$a; done.

and treat it as your ordinary minimal iso. even though it's in graphical mode and has support for basic things gentoo should have.
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PostPosted: Tue Mar 15, 2016 1:39 am    Post subject: Reply with quote

another indication with that particular iso

if you boot in a colorful mode, then u prolly booted in the wrong mode. at least my mobo/videocard i5820k/ga-x99-ud4d/gtx 960 when booting in uefi mode, the grub splash is black and white. the i386-pc mode is colorful. if u boot and see colors, u booted the wrong thing.

also choose try without installing. u will be taken to a comfortable graphical inteface that works in both modes (again dont forget - grub should be black and white if u are in the right mode). and that works even better as minimal cd then the minimal cd does. how hard would have been to add nvme support. i even asked on bugs.gentoo.org. bad management. and now this uefi thing. :(
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axl
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PostPosted: Tue Mar 15, 2016 1:51 am    Post subject: Reply with quote

uhm, not suggesting to use ubuntu. on gentoo forums. just suggesting to use their current iso ( i used ubuntu-15.10-desktop-amd64.iso - just dd-ed that sucked onto a usb stick and then force "bios" to boot the right thing - black white grub). bla bla.

and also suggest, after u boot in uefi mode, u better know what to do with stage3. precompiled gentoo distro. i never compiled my own gentoo under ubuntu. i dont it once under debian on raspberry pi. but that is another story.

in this story, the ubuntu image i suggested is just a minimal iso that knows uefi and nvme and I am deeply sorry for suggesting such a thing on a gentoo site. THE gentoo site. :)

PS. X99 is a weird arch
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kazdva
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PostPosted: Tue Mar 15, 2016 9:45 am    Post subject: Reply with quote

I worked with UEFI only once so I know virtually nothing about it, but once I had similar issues and managed to get them working. Last or two years ago I was trying to get some other distro setup on UEFI laptop. I had a hard time getting it working, util I found in the UEFI menu an option like "legacy mode" or something like that. After enabling it, everything went pretty smooth.
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khayyam
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PostPosted: Tue Mar 15, 2016 1:02 pm    Post subject: Reply with quote

AdamScheller wrote:
I worked with UEFI only once so I know virtually nothing about it, but once I had similar issues and managed to get them working. Last or two years ago I was trying to get some other distro setup on UEFI laptop. I had a hard time getting it working, util I found in the UEFI menu an option like "legacy mode" or something like that. After enabling it, everything went pretty smooth.

Adam ... "legacy mode" would be MBR/BIOS, so if you enable this you're nolonger booting EFI.

best ... khay
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kazdva
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PostPosted: Tue Mar 15, 2016 1:13 pm    Post subject: Reply with quote

Yes, you are right Khay. Now I recall that I ultimately setup this laptop using MBR after getting this "legacy mode" set. While this is not a solution to UEFI problems, it is an alternative if UEFI features are not needed.
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PostPosted: Tue Mar 15, 2016 4:38 pm    Post subject: Re: UEFI install desperation Reply with quote

Francois1 wrote:
Hello,

I am wondering where the efivars come into place? The installation iso boots in mbr mode, should I install them, or activate in the kernel? Don't know what to do.

If the installation ISO is booting in MBR mode you are using the wrong installation media or your BISO isn't setup correctly..
Your BIOS (the UEFI firmware) must to be setup to boot in UEFI mode. Basically CSM/MBR and Secure Boot are disabled. After that is done and you save your changes and exit if the system can't locate any bootable media, it should simply return to the BIOS setup screen. At this point you need a UEFI ISO and the latest SysrescueCD is capable of completing this task. Get the ISO burn it to a disk. Make sure your BIOS is setup correctly and also that it is set to boot the DVD/CDROM first.

Francois1 wrote:
Quote:
From the HANDBOOK
efibootmgr is not a requirement to boot from an UEFI system. The Linux kernel itself can (and will) be booted immediately, and additional boot options can be made part of the Linux kernel itself (there is a kernel configuration that allows the user to specify the boot parameters). Even an initramfs can be made part of the kernel itself.
So what? I remember I read somewhere that efibootmgr is a requirement for correct Grub installation for UEFI. I am lost.
Both are correct however the manual even if not stated clearly is referring to using a UEFI enabled stub kernel. Using the stub kernel and assuming everything is built correctly, you only have one GTP HD with a proper ESP on the system and you ARE NOT going to dual boot with some other OS on the same drive. Your BIOS will find the kernel and boot it immediately.

I can't really tell you how it needs to be done using GRUB or any other boot loader for that matter as I don't use them.

efiboormgr is not required to boot anything in a UEFI system. It is a tool to modify boot entries in the UEFI firmware which may be necessary in some setups.

NOTE about CSM:
Some boards like mine may have an either/or situation where you can set either Legacy Mode(MBR Support) or UFEI Mode (EFI/ESP Support). I have noticed newer boards have CSM (Compatibility Support Module) which you can enable or disable.
Quote:
From a newer AsRock Manual
CSM
Enable to launch the Compatibility Support Module. Please do not disable unless you’re running a WHCK test. If you are using Windows 8 64-bit and all of your
devices support UEFI, you may also disable CSM for faster boot speed.
This makes me think its possible to boot both MBR and ESP HD's on the same system, but as I don't have anything to test it on. I can't be sure how this works.
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PostPosted: Tue Mar 15, 2016 6:09 pm    Post subject: Re: UEFI install desperation Reply with quote

Francois1 wrote:
Hello,

When I boot, I get a black screen, nothing else. I am using grub2 as boot manager.

When you boot do you see the GRUB menu before it goes to a black screen or does the system just boot to a black screen.

Are you 100% sure that when you installed GRUB /boot was mounted? If not GRUB may not give you any error is this case.

Best
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Wallsandfences
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PostPosted: Tue Mar 15, 2016 9:16 pm    Post subject: Reply with quote

My smoothest experience was using fedora as a replacement for minimal.iso. It has all drivers for a skylake intel nuc and nvme 'disk' in contrast to systemrescueCD.
Rüdiger
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PostPosted: Wed Mar 16, 2016 2:00 am    Post subject: Reply with quote

If you plan to use Gentoo in EFI mode, it is logical to boot the Gentoo installation media in EFI mode with efivars support. You will be able to do more like use efibootmgr and grub-install in Gentoo chroot. My experience tell me to prefer to use the efibootmgr from the host installation media instead of the one in Gentoo chroot to manipulate the efivars.

You can set the Linux kernel boot parameters with efibootmgr and not use the kernel configuration feature for this. Things depend on the EFI firmware implementation in your machine too.

You can boot the installation media in BIOS mode and do your Gentoo installation for EFI mode. You need to configure the kernel for EFI mode with of course Efistub, the kernel parameters in the kernel image, including the path to the initramfs if really needed. Than just copy the kernel image in the EFI partition and after a reboot, use the EFI firmware boot menu to select the Linux Efistub kernel and it should boot.

Obviously, to install Gentoo Grub in EFI mode (I don't know any other boot loader in EFI mode) you need to boot the installation media in EFI mode.

I succeed to do what I am writing here.

:lol:
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PostPosted: Wed Mar 16, 2016 2:36 am    Post subject: Reply with quote

Logicien wrote:
Obviously, to install Gentoo Grub in EFI mode (I don't know any other boot loader in EFI mode) you need to boot the installation media in EFI mode.

SYSLINUX aka EXTLINUX https://wiki.gentoo.org/wiki/Syslinux
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PostPosted: Wed Mar 16, 2016 4:41 am    Post subject: Reply with quote

I don't do it the "normal" way, rather than have a /boot and a /boot/efi I just have a /boot.


  1. /boot is a 512m partition of type EF00, formatted as FAT32.
  2. Rather than the typical /boot/efi/EFI/BOOT/bootx64.efi file, I have /boot/EFI/BOOT/grubx64.efi. I shortened the directory path by one level.
  3. /boot/grub/ is on the same EFI partition but in a different directory.
  4. my install command was grub2-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=BOOT --boot-directory=/boot --recheck
  5. The efi partition cares about the path relative to the mount point of the efi partition.
  6. The uefi system does not care what else might be on the fat32 EF00 partition.


The first thing I found was that the 2m partition suggested by the handbook is ridiculous. The partition needs to be formatted fat32, and the smallest partition I could format that way was 512m. Rather than have all that go to waste I combined the /boot and /boot/efi partitions.
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PostPosted: Wed Mar 16, 2016 7:58 am    Post subject: Reply with quote

1clue wrote:

The first thing I found was that the 2m partition suggested by the handbook is ridiculous. The partition needs to be formatted fat32, and the smallest partition I could format that way was 512m. Rather than have all that go to waste I combined the /boot and /boot/efi partitions.


That is strange. Of course 2M partition might be too small (on my EFI partition EFI-enabled kernel takes almost 5M), but there's no problem to format small partitions with FAT32. My EFI partition is 200MB (I've made it this big just in case), which is definitely less than 512M :)
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PostPosted: Thu Mar 17, 2016 10:46 pm    Post subject: Reply with quote

1clue wrote:
I don't do it the "normal" way, rather than have a /boot and a /boot/efi I just have a /boot.

The first thing I found was that the 2m partition suggested by the handbook is ridiculous. The partition needs to be formatted fat32, and the smallest partition I could format that way was 512m. Rather than have all that go to waste I combined the /boot and /boot/efi partitions.


ODD indeed. I read documentation some time back that recommended a 512m/FAT32 ESP, but that was a recommendation not a requirement. I agree that 2m is ridiculous and way to small to place a kernel stub on. Then again it all depends on how one decides to set things up.

I don't do it the "normal" way either if there is such a thing with Gentoo. I use the efi kernel stub and build self booting kernels and I tend to build everything directly into the kernel, using modules for testing purposes only. Each kernel can use up to 6m of space. My ESP (/dev/sda1) is a 64m/FAT32 partition whose mount point is /boot/efi. It contains the directory structure /EFI/gentoo. the /gentoo directory is where I place my kernels and 64m gives me enough space to have several kernels for testing as well as my main kernel.

What tool did you use to create the ESP? I can't remember but I use either gdisk or gparted..... :)
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PostPosted: Sun Mar 27, 2016 10:52 am    Post subject: Reply with quote

1clue wrote:
I don't do it the "normal" way, rather than have a /boot and a /boot/efi I just have a /boot.

In latest install i have EFI partition mounted /boot/efi, /boot is just directory in single root partition. EFI partition has just one file /boot/efi/EFI/gentoo/grubx64.efi. In install i had /boot/efi mounted and used "grub2-install /dev/sda" command to install and configure bootloader, it also did efibootmgr configuration.

Code:
/dev/sda1                125M  353K  124M   1% /boot/efi


128M partition is way too big.
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