On Friday, 21 May 2021 20:06:25 BST Michael wrote: > On Friday, 21 May 2021 15:42:01 BST pe...@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.
Thanks Michael. I've finally got it booting, by resorting to the same hack as I did on my previous machine. Using efibootmgr to add a UEFI boot record does create it, but selecting it in the BIOS fails and it just drops to the next in line: Windows 10. No adjustments to the --create command resulted in a bootable system, so I had to run bootctl-install as well and then remove the hex-numbered directory and restore my own loader.conf. I spent days wrestling with this. It's clear that I just don't understand UEFI booting. It sounds simple enough, but it clearly isn't. I've read everything I could find on the subject, to no avail. -- Regards, Peter.
