efibootmgr help

[Gordon Messmer]

On 08/30/2015 10:18 AM, Paul Cartwright wrote:
> On 08/30/2015 12:17 PM, Gordon Messmer wrote:
>>> Boot0005* Fedora
>>> HD(8,GPT,ac2fc695-5de9-47d0-a19b-01e236404130,0x5ae5d800,0x2f800)/File(\EFI\FEDORA\shim.efi)
>>>
>>> Boot0009* UEFI OS
>>> HD(8,GPT,ac2fc695-5de9-47d0-a19b-01e236404130,0x5ae5d800,0x2f800)/File(\EFI\BOOT\BOOTX64.EFI)
>>>   
> 0005 & 0009 are both fedora.. same UUID, hd(8..

Both of those entries identify a boot loader located on the same 
partition.  Everything before "/File" is part of the device path.

> how do you boot different files shim vs bootx64..

I'm not sure how to make that more clear than it is.  You have a FAT32 
filesystem which contains many files.  One of them is 
\EFI\Fedora\shim.efi, which verifies and loads grubx64.efi.  The other 
file is \EFI\BOOT\BOOTx64.EFI.

When you select a boot option from the UEFI menu, or as a result of 
searching the list for a valid boot loader, the firmware will load the 
file into memory and begin execution of whatever code is in that file.