livecd ~ # parted  /dev/nvme0n1 print
Model: Unknown (unknown)
Disk /dev/nvme0n1: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name        Flags
 1      1049kB  106MB   105MB   fat32           EFIboot     boot, esp
 2      106MB   53.8GB  53.7GB  linux-swap(v1)  SWAP
 3      53.8GB  107GB   53.7GB  ext3            NVM-SYSTEM
 4      107GB   161GB   53.7GB  ext3            NVM-SYSBCK

3.3   Mounting the root partition

livecd ~ # mount /dev/nvme0n1p3 /mnt/gentoo/

3.4   Downloading the stage tarball
...... následuje klasická instalace gentoo na  3      53.8GB  107GB   53.7GB  ext3            NVM-SYSTEM ....


6   Kernel

6.2   UEFI

https://wiki.gentoo.org/wiki/Efibootmgr potřebuje NLS ISO 8859-1 a vypnutý EFI mixed-mode support

emerge -avq sys-boot/efibootmgr
mount | grep efivars # must be RW otherwise try somthing like
# mount -o remount,rw -t efivarfs efivarfs /sys/firmware/efi/efivars
efibootmgr -v # just list entries for fun :)

6.3   kernel

emerge --ask --verbose --update --deep --newuse  -q --load-average --jobs -N sys-kernel/gentoo-sources sys-apps/pciutils
lspci
ls -al /usr/src/
cd /usr/src/linux
make menuconfig

    Nastavení kernelu

        Sensor driver: X570 boards (no WMI interface - use nct6775 driver instead)

        (root=/dev/nvme0n1p3) Built-in kernel command string - podle skutecne partisny, kde ten linux bude

Processor type and features  --->

  [*] EFI runtime service support
  [*]   EFI stub support
  [ ]     EFI mixed-mode support
  [*] Built-in kernel command line
  (root=/dev/nvme0n1p3  net.ifnames=0 vga=ask) Built-in kernel command string


Firmware Drivers  --->
  EFI (Extensible Firmware Interface) Support  --->
    <*> EFI Variable Support via sysfs





6.5   Mounting the boot partition (pro kernel)

(chroot) livecd / # mount /dev/nvme0n1p1 /boot/ # To je EFI

(chroot) livecd / # df -h  /boot
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p1   99M   512   99M   1% /boot

6.6   Compiling kernel

make -j 26
make modules_install

# tady na te EFI udelam adresar, kam zkopiruju kernel, ktery ma nastaveno, kde je system

mkdir -p /boot/EFI/'Gentoo-NVM-SYSTEM'  # or any other name under /boot/EFI
cp /usr/src/linux/arch/x86/boot/bzImage /boot/EFI/'Gentoo-NVM-SYSTEM'/bzImage.efi
efibootmgr -c -L "Gentoo-NVM-SYSTEM" -l '\EFI\Gentoo-NVM-SYSTEM\bzImage.efi'  -d /dev/nvme0n1p1




7   PROBLEMY !!! bomb

    System nebootuje, proste NVMe nejde vybrat.

        bzImage.efi jde spustit z GRUB2 na flasce linux (hd2,1)/EFI/Gentoo-NVM-SYSTEM/bzImage.efi - nebo jiny hdx - a bezi to, ale v EFI to vybrat nejde

            Řešení - je potřeba říct, z jaké EFI partišny to má bootovat (default je z té připojené) - " -d /dev/nvme0n1p1"

                efibootmgr -b 0 -c -L "NVM-Gentoo-NVM-SYSTEM" -l '\EFI\Gentoo-NVM-SYSTEM\bzImage.efi' -d /dev/nvme0n1p1


9.2   Nastavení EFI, když ho něco zboří

################################################################################
# cat ebm
################################################################################
#!/bin/bash -x

efibootmgr -B -b 0
efibootmgr -B -b 1
efibootmgr -B -b 2

mount /dev/nvme0n1p1 /boot/
efibootmgr -b 0 -c -L "NVM-Gentoo-NVM-SYSTEM" -l '\EFI\Gentoo-NVM-SYSTEM\bzImage.efi' -d /dev/nvme0n1p1
efibootmgr -b 1 -c -L "NVM-Gentoo-SDA2" -l '\EFI\Gentoo-SDA2\bzImage.efi' -d /dev/nvme0n1p1
efibootmgr -b 2 -c -L "NVM-Gentoo-NVM-SYSBCK" -l '\EFI\Gentoo-NVM-SYSBCK\bzImage.efi' -d /dev/nvme0n1p1
umount /boot

mount /dev/sda1 /boot/
if ( df /boot | grep -q /dev/sda1  ) ; then
        echo SDA
        efibootmgr -B -b 3
        efibootmgr -B -b 4
        efibootmgr -B -b 5

        efibootmgr -c -L "SDA-Gentoo-NVM-SYSTEM" -l '\EFI\Gentoo-NVM-SYSTEM\bzImage.efi' -d/dev/sda1
        efibootmgr -c -L "SDA-Gentoo-SDA2" -l '\EFI\Gentoo-SDA2\bzImage.efi' -d/dev/sda1
        efibootmgr -c -L "SDA-Gentoo-NVM-SYSBCK" -l '\EFI\Gentoo-NVM-SYSBCK\bzImage.efi' -d/dev/sda1
fi
umount /boot

efibootmgr -o 0,1,2

efibootmgr -D