What is the different between Host Bios Exit type and Host EFI Exit Type?

Amerhbb

I would like to know What is the different between Host Bios Exit type and Host EFI Exit Type?
what is the discription of the different options: SANBOOT, GRUB, GRUB_Firest_HDD, GRUB_First_ CDROM, GRUB_Found_Windows?

Thanks

JJ Fullmer

@amerhbb
I’m pretty sure there’s definitions of this elsewhere in the forum or in documentation/wiki that is more thorough.

But here’s a quick overview

Exit Types

EFI exit type

Used for computers in EFI/UEFI mode. This is used in all modern computers for the last few years
Setting the efi exit type is the behavior fog will use when ‘booting to hard drive’ the pxe menu was booted to via an efi/uefi boot option

Bios

For older computers or computers using legacy/bios mode
This defines the behavior when the fog boot menu is accessed via a legacy/bios boot option and then ‘boot to hard drive’ is selected

SANBOOT

Works for bios exits by issuing a sanboot command to boot to hard drive
~~Doesn’t work with efi in my experience~~ EDIT: iPxe has since updated the behavior of SANBOOT and it now works with EFI and is the recommended option.
This is a good standard default for bios exit type

GRUB

Uses a grub boot loader hosted on fog to attempt to boot to the OS
This can work with efi or bios, but it isn’t always super reliable in my experience. It’s a good option to use when troubleshooting a computer that is having trouble exiting the fog boot menu to get to the hard drive

GRUB Sub options

The sub options like first_HDD, first_windows etc. attempt to do exactly what they say. They are just GRUB bootloader options

rEFInd

This uses a tool called rEFInd, which re-finds all efi boot options
- The fog refind conf just boots to the harddrive/os option it finds. It can be configured to give a menu of options
This can work with bios options in theory, but it’s meant for EFI exit
~~This is a good default for efi boot options~~ You can now use SANBOOT instead and it should work properly in EFI, though rEFInd is still a powerful tool

Hope that helps.

Amerhbb

@jj-fullmer Thanks alot