I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
Thanks
Jerry
On Thu, Sep 19, 2019 at 6:43 AM Jerry Geis jerry.geis@gmail.com wrote:
I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
Thanks
Jerry _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Perhaps a silly question but 1- Does your new machine has EFI mode enabled on BIOS and not CSM? 2- is it at the same port/bay as the original one? 3- When do you say "not even boot" what do you mean? any messages on screen? past POST/BIOS/EFI does it gets to the linux bootloader?
On Thu, 19 Sep 2019, Jerry Geis wrote:
I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
I think the issue is that the UEFI firmware doesn't know which UEFI boot loader to load. I think this should help:
https://noobient.com/2017/09/27/fixing-the-efi-bootloader-on-centos-7/
Boot into rescue mode, and run:
efibootmgr --create --label CentOS --disk /dev/sda1 --loader "\EFI\centos\shim.efi"
I think you then should end up in a happy place. You can probably add that entry by hand within the UEFI config itself.
HTH,
jh
On Thu, 19 Sep 2019, Jerry Geis wrote:
I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
I think the issue is that the UEFI firmware doesn't know which UEFI boot loader to load. I think this should help:
https://noobient.com/2017/09/27/fixing-the-efi-bootloader-on-centos-7/
Boot into rescue mode, and run:
efibootmgr --create --label CentOS --disk /dev/sda1 --loader "\EFI\centos\shim.efi"
I think you then should end up in a happy place. You can probably add that entry by hand within the UEFI config itself.
Just wondering, will it still boot if he then puts the disk back to the other machine?
Regards, Simon
On Thu, 19 Sep 2019, Simon Matter via CentOS wrote:
Just wondering, will it still boot if he then puts the disk back to the other machine?
My understanding is yes, as this is just updating the EFI Boot Manager, which is stored in non-volatile storage on the motherboard.
If anyone knows better, feel free to poke holes in my limited understanding.
jh
My experience with UEFI is that it is a black art. Fought with it until a deadline forced me to non-UEFI. In my case a drive-based UEFI partition (FAT32) was required. See if efibootmgr is available and would help you. I should note that, in the process. I discovered that the UEFI standard makes no provision for RAID if it is disk-based. I would love to hear someone contradict me on that and point me to documentation on how to do it without resorting to exotic maneuvers. ________________________________ From: CentOS centos-bounces@centos.org on behalf of Jerry Geis jerry.geis@gmail.com Sent: Thursday, September 19, 2019 6:42 AM To: CentOS mailing list centos@centos.org Subject: [EXTERNAL] [CentOS] UEFI booting
I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
Thanks
Jerry _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
On Sep 19, 2019, at 7:42 AM, Jerry Geis jerry.geis@gmail.com wrote:
I installed my first UEFI disk yesterday. Seemed to go fine. CentOS 7.6 x86_64 I then took that disk "out" of that machine and put it another machine - it seems to not even boot. I put the original disk back in that machine and it boots fine.
I put the UEFI disk back in the machine I built it on and it works fine. They are similar machines either and i3 and i7.
Shouldn't that work? Build a UEFI disk on machine A - move it to machine B?
UEFI isn’t really a *disk* but a hardware firmware setting on the computer’s motherboard. Instead of looking for a boot configuration in the Master Boot Record of the disk, the UEFI firmware looks for it on a specially labelled FAT32 partition with an EFI directory on it.
If your motherboard’s firmware can boot UEFI, then it can boot off the UEFI executables on that disk. If the motherboard is too old and only supports MBR (legacy) boot mode, it’ll look for the MBR on the disk. If you’ve got a newer motherboard, but it’s set to boot in legacy mode (which is just a specialized UEFI boot service that emulates the old boot method) it’ll only look for the legacy boot bits.
I would not be surprised that your other system would not immediately detect a UEFI disk if it was set to look for the legacy boot method.
-- Jonathan Billings billings@negate.org
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