(C) Martin Väth (martin at mvath.de). This project is under the GPL-2 license. SPDX-License-Identifier: GPL-2.0-only
A grub.cfg library/example for GRUB2
The generator tool grub-mkconfig provided by GNU's GRUB2 bootloader
is far from being optimal for many purposes.
It can be very hard to modify that generator tool to produce a reasonable
configurable menu. Instead of modifying this script, I recommend
to write the desired config directly into your boot/grub/grub.cfg
and to load a "library" of convenient functions to use from your config.
The provided boot/grub/grub-mv.cfg is such a library.
It should be mostly self-explanatory, especially when you see how
it is used in the provided boot/grub/grub.cfg.
The latter assumes that there are two ext4 partitions (sda1 and sda2)
and a further swap (suspend) partition (sda3), all on the first harddisk
with an msdos partition table, the first two partitions containing
two linux installations (one for 64 bit and one for 32 bit).
The files /boot/bzImage, /boot/bzImage.previous and /boot/bzImage.debug
are supposed to be symlinks to the current/previous/debugging kernel
of the corresponding partition.
If you compile/install the kernels with https://github.com/vaeth/kernel
these symlinks will be updated automatically.
No initramfs is supposed to be used - with the exception of
/boot/intel-uc.img so that the kernel can update
your processors microcode before starting (recommended).
Read the grub documentation if you need initramfs for another purpose or other fancy configuration stuff.
In the example configuration also some further tools (SMB boot manager and memtest) are supposed to be installed.
Of course, it is not really expected that this is your partition layout:
This is merily an example, and should be easy to modify.
However, even if by accident you should have exactly the same layout,
you have to modify the provided grub.cfg to set appropriate values
for PARTUUID and UUID.