A lot of people, including me obviously, prefer to follow down the details of a boot process on a text console of oe linux. Unfortunaltely, populating such a detailed output is not the default setting after a fresh install of the operating system. You usually get a graphical boot progress animation, hiding most iff not all of the detail output, based on
rhgb). The boot screen dimension is another problem here, because following output on a 80×30 resolution is not fun kicking in. So where to start off?
GRUB_CMDLINE_LINUX and some sort of
update-grub I would think… but that’s wrong and even counter-productive for rh based distributions, really.
In fact, the integration of
grub2 into oe linux is kind of different from the supposed picture given in https://www.gnu.org/software/grub/manual/html_node/index.html. That is, oe linux does not honour the variables being set with
/etc/default/grub at all,
GRUB_TIMEOUT being an exception on test, when recreating
/boot/grub2/grub.cfg. There is no
update-grub, like on debian likes, and moreover, do not use
grub2-mkconfig -o /boot/grub2/grub.cfg, as recommended all around the net, on oe linux, because
grub2-mkconfig may rewrite your kernel boot menue titles such that your default kernel setting may become stale (http://brainpan.io/wiki/Grub_2_Tips_%26_Tricks). Use
grubby, see below.
Ok, instead of separating the
grub2 boot variables in
/etc/default/grub, oe linux derives any boot settings to be applied to a current kernel for reboot or most importantly for a new kernel on install from what is already present in
/boot/grub2/grub.cfg for the running kernel. Its another approach, for whatever reason, like it or not. Changing the boot settings for the current kernel involves a script called
grubby (https://www.mankier.com/8/grubby). Going for a kernel on install with yum executes the script
new-kernel-package (https://www.mankier.com/8/new-kernel-pkg), which in turn again uses
grubby under the covers. So what you need to make shure is that anything envisioned for modification or installation will already be present in