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