Re: Failure in gsetting up a UEFI USB Flash with Fedora 33??

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On Sat, Sep 11, 2021 at 01:11:38AM +1000, Michael D. Setzer II via users wrote:
> The G4L kernels require no kernel modules. That is one 
> the file system will work with any of the kernels with no 
> changes at all.  Just build new kernel, and copy it to the 
> boot directly ad change the lines in the syslinux.cfg to 
> match the latest kernel. Don't have to make any changes.

So, that makes sense, and if this is a heavily customized,
boot-from-ram system, then it would work fine with all the drivers
compiled into the kernel and not as modules, although it would make
the kernel rather large.

> After doing a dnf update on the build machine, have a 
> simple script that automatically copies any new program 
> files and libraries that were updated.

Wait, I'm confused, now you are talking about dnf, I thought this was
an all-in-one initrd system, what is using dnf?

> The kernels have the EFI option in the .config file, so the 
> kernels should be able to be loaded via the EFI process 
> somehow, but so far I haven't gotten it to work. Maybe I'll 
> eventual figure it out, or maybe not. Like I've said, 
> Clonzilla went with booting a distribution that supported 
> UEFI, and then added there stuff to that. Could do the 
> same, but it requires a lot more steps then simple booting 
> from a CD or USB... 

Where are you putting these kernels on the EFI volume?

For example, if you have the msdos-formatted volume mounted as
/boot/efi, the EFI firmware looks for this:

/boot/efi/EFI/BOOT/BOOTX64.EFI

... by default.  You can make that be your kernel, a GRUB2 EFI
executable or the shimx64.efi, which is what Fedora systems uses.  The
shimx64.efi executable is a signed UEFI executable that launches
GRUB2.  But if you want to disable Secure Boot, you could just put it
in EFI/BOOT/BOOTX64.EFI and it should detect it by default.

> Seen some post on Windows 11 hardware requirements, 
> and it might soon make only secure boot a requirement 
> for anyone.

The UEFI spec says that on x86_64 systems you should be able to
disable secure boot.  Dell most likely has that option, because they
have a lot of customers who need it. (for example, if you use nvidia
and CUDA, you'll need to disable secure boot or manually install your
own signing keys)

> Just seems there should be a way to get it to 
> work, but I'm retired and gives me something to play 
> with. I don't have any machines that require UEFI boot. 
> Perhaps I should setup a system with UEFI, and see if the 
> 40_custome option works. I do know that a UEFI boot 
> system will fail to install memtest.

libvirtd lets you set up UEFI VMs, even on systems that don't have
UEFI boot, which is something I have.  In virt-manager, just click to
configure the VM before starting the install, and go over into
Overview, you can change the Firmware from BIOS to UEFI.  I believe
there's a secboot firmware option, even, although I've not tested it.

Then you can test to your heart's content.  

-- 
Jonathan Billings <billings@xxxxxxxxxx>
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