On Mon, Jun 14, 2021 at 12:20:44AM +0100, Neil Bothwick wrote
> On Sun, 13 Jun 2021 18:57:49 -0400, Walter Dnes wrote:
>
> /etc/default/grub is only used when you call grub-mkconfig.
>
> > 1) Is "insmod extfs3" necessary? I've built extfs3 into the kernels.
>
> If the kernel is on an ext3 filesystem, yes. This is GRUB's module, it
> uses it to read an ext3 filesystem in order to load the kernel.
Some confusion here. "fdisk -l" on my new machine gives...
Device Start End Sectors Size Type
/dev/sda1 2048 526335 524288 256M EFI System
/dev/sda2 526336 1886416303 1885889968 899.3G Linux filesystem
/dev/sda3 1886418352 1953523119 67104768 32G Linux filesystem
The EFI Systen partition is fat32. The web examples I read show
"insmod <filesystem>" matching the filesystem of the linux system being
booted. But all entries in grub.cfg on my new machine are "insmod fat".
I wonder if the web documentation was referring to BIOS-booting machines.
grub.cfg would be sitting on an xfs or extfs3 or whatever file system,
and would need to read it off that filesystem.
I have a UEFI system which demands a fat32 boot partition. Since grub
and the kernels are sitting on a fat32 partition, my machine needs
"insmod fat".
Things that make you go hmmmm...
* you need to put "insmod fat" in grub.cfg to tell grub that the kernels
are sitting on a fat32 partition
* but grub has to first read grub.cfg on the fat32 partition before it
knows that it must read a fat32 partition
I wonder if this is due to the verbose automagic configuration. I
also noticed that all menuentries on my machine contain "insmod gzio
and "insmod part_gpt", so I'm including them here. Here is my proposed
grub.cfg. If anybody sees any problems, please let me know. Otherwise,
I'll try the following tomorrow on the new machine...
========================================================================
set timeout_style=menu
set timeout=15
insmod vga
set gfxpayload=640x480
insmod gzio
insmod part_gpt
insmod fat
set root='hd0,gpt1'
menuentry 'Linux Experimental' --class gnu-linux {
linux /vmlinuz-experimental root=/dev/sda2 ro noexec=on
net.ifnames=0 intel_pstate=disable ipv6.disable=1
}
menuentry 'Linux Experimental Recovery' --class gnu-linux {
linux /vmlinuz-experimental root=/dev/sda2 ro
}
menuentry 'Linux Production' --class gnu-linux {
linux /vmlinuz-production root=/dev/sda2 ro noexec=on net.ifnames=0
intel_pstate=disable ipv6.disable=1
}
menuentry 'Linux Production Recovery' --class gnu-linux {
linux /vmlinuz-production root=/dev/sda2 ro
}
--
Walter Dnes <waltd...@waltdnes.org>
I don't run "desktop environments"; I run useful applications
