Re: [gentoo-user] Dual booting with Windows 10

[Michael <confabulate@kintzios.com>]

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On Friday, 21 May 2021 15:42:01 BST peter@prh.myzen.co.uk wrote:
> Hello list,
> 
> Mynew machine has Win-10 installedon /dev/nvme0n1 with the ESP as partition
> 1. I want to install Gentoo on /dev/nvme1n1. So far I haven't found a way
> to set up a working boot arrangement. I've tried mounting the ESP on /efi,
> on /EFI and on /boot/EFI. Efibootmgr seems to write a boot entry in some of
> those cases, and it's still there after a reboot - but it isn't visible to
> the BIOS.
> 
> Can anyone offer some enlightenment, please?

If your ESP is on /dev/nvme0n1 and you are using vmlinuz symlinks, you can use 
/boot/EFI as the mountpoint for the ESP VFAT partition.  Your kernels/config/
System.map/initrd.img files will go into /boot, which will be on the same fs 
as / on /dev/nvme1, using a fs which supports symlinks.

The efibootmgr '--loader' option should/could be used to specify the path to 
your bootloader image, or if you are not using a bootloader image to chainload 
your kernel with, point it directly to the path of your kernel; e.g.

efibootmgr --create --disk /dev/nvme0n1 --part 1 --label "gentoo-5.10.27" \
--loader "\EFI\gentoo\gentoo-5.10.27.efi"

The BIOS/UEFI menu should be able to list entries of bootable *.efi images, as 
long as they are within the subdirectory of /boot/EFI on the ESP, but if you 
are using a bootloader, then it is the bootloader image which will run and 
chainload your OSs and their kernels.

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