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grub2, fallback & recovery

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https://bbs.archlinux.org – I've been trying to understand the generation of grub.cfg and the different options available in grub2's menu at boot time. It seems much more complicated than yaboot!/etc/default/grub contains lines for both GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT.It seems that GRUB_CMDLINE_LINUX options are added to kernel command lines for all linux options? And that GRUB_CMDLINE_LINUX_DEFAULT options are added to the command lines for normal and fallback linux options, but not recovery linux options?Somebody in the forums also mentioned GRUB_CMDLINE_LINUX_EXTRA as intended for options w (HowTos)