Trying to understand efibootmgr
When I type "efibootmgr -v" in Slackware, I get:
Code:
BootCurrent: 0005 If I boot from a CD and run the same command, I get: Code:
BootCurrent: 0006 |
UEFI BIOS may seem mixed up more easily or often than we like, but they aren't stupid. When there is bootable removable media during POST, they would normally include it among boot selections, unless some option in BIOS setup directs it be ignored or disabled.
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What surprised me was that there isn't a permanent entry for the cdrom drive. After all, the UEFI chip must be able to detect that there is a second SATA drive in the machine. Having an entry for the empty drive surely wouldn't do any more harm than those empty Windows entries. As far as I can see, UEFIs treat non-functioning boot entries the same way that BIOS's do: just try the next one on the list!
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BIOS differ. My newest are two Kaby Lakes. The Asus' BIOS doesn't remember as much as my Gigabyte's does, which includes hard disks (2), NVME (1) devices, and labels of unattached OM and USB sticks. How many it's capable of I can't say. There are 7 total ATM (4 removables).
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UEFI boot seems to grow.
sudo efibootmgr to view is fine usually. To remove entries sdo efibootmgr -Bb 009 for example. Everyone has to monitor their systems if they have one that never seems to stop adding entries. I have one that will get up to 400 or so before I have to do a mass delete. |
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