Den 22. aug. 2016 17:05, skrev Peter Humphrey: > Hello list, > > Following today's marking of gummiboot as to be deleted in a month, I had a > look at efibootmgr in the wiki pages. It looks as though I'll be able to use > it instead, but one thing puzzles me: is it possible to create a set of > configs for several kernels, the way gummiboot does in > /boot/loader/entries/*.conf? Actually, I'd also like to specify each of two > kernel versions with three different command lines to start different run > levels. > > My brain isn't working very well today, so would anyone like to offer me > some advice? Please? :) > As far as I can tell, you need a separate executable for each menu-entry. The "menu" would then be the modern descendant of the "bios" boot-list. Works well for two or three standard boot-configurations.
Booting straight into linux on an EFI system without a boot-loader means you have no way to provide command-line or initramfs as far as I can tell, all modules must be compiled in, and default command-line needs to be set in the kernel config. EFI executables can also be created for example by dracut, which will allow kernel, command-line and initramfs in one efi-file. I have never tried this, I'm using xen.efi (a hypervisor kernel) with a config file, which allows loading of separate kernel and initramfs. Config is just a text file with the same name as the executable, with a .cfg extension. Linux has no such magic available I believe. Copying of executables gets unwieldy fast, plus I have found no way to edit the command-line. Therefore I keep a grub2 install as well, which has editable commmand-lines and such, and also sys-boot/systemrescuecd-x86-grub. I put GRUB_PLATFORMS="efi-64" in /etc/portage/make.conf. I let /boot/EFI/Boot/BOOTX64.EFI be a copy of the Grub EFI binary, so that whenever I update the bios and wipe all efi variables, I can boot into Grub, given that /boot/EFI is where I mount my EFI boot partition. Works as advertised. Grub is not able to load xen.efi, so I need to keep xen.gz around as well for that.
