Subj : uefi
To : Gerrit Kuehn
From : Kai Richter
Date : Fri May 27 2022 01:13 pm
Hello Gerrit!
24 May 22, Gerrit Kuehn wrote to Kai Richter:
KR>> The result is that the menu to select the starting OS is moved from
KR>> the disk to the BIOS.
GK> I talked about cases where something is broken and your system doesn't
GK> boot (maybe not even the bootmanager comes up). With MBR this means
GK> reconfiguring BIOS boot order,
You have to enter the uefi shell by the same way: Dive into the BIOS and select it. If the system doesn't boot the boot override function is essential.
GK> probably getting some USB media to boot a rescue system from it etc.
GK> With the built-in UEFI shell, you can already check your partitions
GK> and even select what to boot
I couldn't. The, no, my uefi shell is not self explaining. I failed to start a running system from the uefi shell. Well, ok, my fault.
GK> without having to reconfigure anything or to provide a rescue system
GK> on USB. In many cases I was able to manually boot the failed system
GK> with this and use the system itself then to fix booting.
GK> Some manufacturers provide firmware and bios update tools on efi
GK> meanwhile. In that case, you can just drop the new firmware and the
GK> upgrade tool on a USB stick and use UEFI-shell to run it from there.
So i have to wait until my BIOS company updates it's tools and i can save them within the BIOS. Back in the old days i had my OS/2 bootmanager and rescue system on a small partition.
GK> In the MBR-days you would have needed to have a MSDOS-system on the
GK> USB stick in addition
Why DOS? We need to kickstart the boot sequence.
USB stick in addition? I see an EFI partition on my disk in addition.
I've done 50% reading of an efi turorial now and it does remind me to grub.
GK> (and hope that the manufacturer would still provide a DOS-based
GK> update tool that is able to run on your newly bought server or
GK> workstation).
I'v seen an EFI editor which my bios doesn't have. Now i've to check if anyone provides this efi software. The default path in my uefi shell does have something like fs[01234]:/efi/tools. The design concept is to add tools from a maintenance/rescue partition like we did before from the usb stick or from a /boot partition.
Maybe the only thing i need is to get used to it...
