On 2021-06-13, Walter Dnes <waltd...@waltdnes.org> wrote:
> On Sun, Jun 13, 2021 at 05:38:53PM -0000, Grant Edwards wrote
>> On 2021-06-13, Walter Dnes <waltd...@waltdnes.org> wrote:
>>
>> > I'd be tempted to do a manual gub.cfg if I had documentation.
>>
>> I gave up on the grub2 auto-magical config system many years ago. My
>> grub.cfg is typically 10-20 lines long. The documentation is at
>>
>> https://www.gnu.org/software/grub/manual/grub/grub.html
>>
>> For manual confiuration: see section 6:
>>
>>
>> https://www.gnu.org/software/grub/manual/grub/html_node/Configuration.html#Configuration
>
> When experimenting with this, I'll backup grub.cfg. If things go
> awry, boot with the USB key I used for the install, and copy back the
> old known working grub.cfg. I've done a first crack at this. I assume
> that nothing in /etc/default/grub will have any effect. Questions...
>
> 1) Is "insmod extfs3" necessary? I've built extfs3 into the kernels.
I've never used it it, and my boot partitions are always ext3/4
> 2) I assume that the the first "menuentry" will be the default boot?
Unless you set the `default` variable to something other than 0
> 3) Is the default timeout still 5 seconds?
Dunny, I always set 'timeout=10'
> 3) I assume that 640x480 is supported on just about every monitor
> out there. I want as large text as possible. My eyes are
> getting old... just like me. Any obvious errors in the following
> grub.cfg?
>
>=====================================================================
> menuentry 'Linux Experimental' --class gnu-linux {
> set gfxpayload=640x480
> insmod ext3fs
> set root='hd0,gpt1'
> linux /vmlinuz-experimental root=/dev/sda2 ro noexec=on
> net.ifnames=0 intel_pstate=disable ipv6.disable=1
> }
I don't know if you really need the gfxpayload or the insmod lines, I don't
recall ever needing those to boot kernels from ext3/4 partitions.
All my grub.cfg files looks like this:
========================================================================
timeout=10
root=hd0,1
default=0
menuentry 'vmlinuz-5.10.27-gentoo' {
linux /boot/vmlinuz-5.10.27-gentoo root=/dev/sda1
}
menuentry 'vmlinuz-5.4.97-gentoo' {
linux /boot/vmlinuz-5.4.97-gentoo root=/dev/sda1
}
========================================================================
> Something that occured to me. Can I move the duplicated lines to the
> top of the file and take them out of the menuentries? E.g.
Yes.
