4 ms·

So does uefi support multi boot or not?

by Aardwolf 9y ago

zootboy 9y ago
Yes, UEFI supports multiboot.
- tripletmass 9y ago
  Meh, unsigned! No good without UEFI mode 3+ (where 0 looks like a legacy BIOS, 3 is signed, 3+ is signed/enforcing) per OP-article. New Intel site (uefi.org still OK) uefidk.com/develop/development-kit/ is...down? [People not making a machine key, so they can get back to setup mode...no mention of signing:) https://communities.intel.com/thread/118403?wapkw=uefi+signing https://communities.intel.com/thread/118403?wapkw=uefi+signi... https://www-ssl.intel.com/content/www/us/en/security/practical-uefi-secure-boot-part-3-video.html https://www-ssl.intel.com/content/www/us/en/security/practic... --2013 video showing unleaded dual-boot Linux Foundation has wboot for signing, it mentions... UEFI (seemed to) promise to offer: suspend/hibernate in each OS, seamless secure power mode switching from each OS, multiple default displays and diagnostics...
0xcde4c3db 9y ago
The standard supports multiple bootloaders, but specific implementations may be locked down to a single one. Even on systems that support multiple bootloaders, it's pretty common to bypass the built-in menu in favor of a more configurable chainloader like GRUB or rEFInd.
- deleted 9y ago
  [deleted]
- snuxoll 9y ago
  I mean, basically every UEFI implementation I've worked with supports any number of boot entries - but I'm forced to hit a key during startup to even get to the menu to select one. All it would take is an option to present a selection menu every boot (unless the operating system has asked to boot a specific one during a reboot) and I would set my grub timeout to like 2 seconds with no menu by default.
josteink 9y ago
> So does uefi support multi boot or not? UEFI was pretty much designed to solve the multi boot issue in a clean way where different OSes don’t step on each other’s toes and creates issues. This has worked fine from day one, even from a single physical volume.
- Celarnor 9y ago
  It works fine except when it doesn't, which is most of the time (either secureboot, or the EFI boot manager, or the Windows 8+ "fast startup" thing that can turn itself on during an update and sets the EFI next-boot option, permanently overriding any GRUB selection until you turn it back off from inside Windows..) Compared to how hassle-free multiple operating systems is to do via legacy boot, UEFI feels incredibly backward. It feels unfinished, is fragile and breaks far too easily for something so critical. I'm not looking forward to it being taken away. Guess I'll have to ditch my other OSes and do my important work in a VM.
  - josteink 9y ago
    > It works fine except when it doesn't That can be said about anything. > which is most of the time Not to come off snarky, but citation needed. > either secureboot, or the EFI boot manager What issues do they cause? Really? > Windows 8+ "fast startup" thing that can turn itself on during an update and sets the EFI next-boot option Clearly annoying, but easily fixed. I'd rather have this once a year than Windows deciding it has the right to write to my MBR, and overwrite GRUB, causing my Linux installation to be unbootable without a recovery-disk. > Compared to how hassle-free multiple operating systems is to do via legacy boot That may be true for multi-volume scenarios. For systems with one volume only however (like most laptops), it's absolute the opposite. > It feels unfinished, is fragile and breaks far too easily for something so critical My experience is quite the opposite. With UEFI I feel I can fearlessly dual/multi boot several operating systems without fear that one OS is going to mess up another one. And I know that if something happens once a leap year or so, EFI has proper tooling so it's easy to fix, unlike black-boxed MBR bootloaders and the hacks involved with chain-loading different OSes on top of them.

So does uefi support multi boot or not?

zootboy 9y ago

Yes, UEFI supports multiboot.

tripletmass 9y ago
Meh, unsigned! No good without UEFI mode 3+ (where 0 looks like a legacy BIOS, 3 is signed, 3+ is signed/enforcing) per OP-article. New Intel site (uefi.org still OK) uefidk.com/develop/development-kit/ is...down? [People not making a machine key, so they can get back to setup mode...no mention of signing:) https://communities.intel.com/thread/118403?wapkw=uefi+signing https://communities.intel.com/thread/118403?wapkw=uefi+signi... https://www-ssl.intel.com/content/www/us/en/security/practical-uefi-secure-boot-part-3-video.html https://www-ssl.intel.com/content/www/us/en/security/practic... --2013 video showing unleaded dual-boot Linux Foundation has wboot for signing, it mentions... UEFI (seemed to) promise to offer: suspend/hibernate in each OS, seamless secure power mode switching from each OS, multiple default displays and diagnostics...

0xcde4c3db 9y ago

The standard supports multiple bootloaders, but specific implementations may be locked down to a single one. Even on systems that support multiple bootloaders, it's pretty common to bypass the built-in menu in favor of a more configurable chainloader like GRUB or rEFInd.

deleted 9y ago
[deleted]
snuxoll 9y ago
I mean, basically every UEFI implementation I've worked with supports any number of boot entries - but I'm forced to hit a key during startup to even get to the menu to select one. All it would take is an option to present a selection menu every boot (unless the operating system has asked to boot a specific one during a reboot) and I would set my grub timeout to like 2 seconds with no menu by default.

josteink 9y ago

> So does uefi support multi boot or not? UEFI was pretty much designed to solve the multi boot issue in a clean way where different OSes don’t step on each other’s toes and creates issues. This has worked fine from day one, even from a single physical volume.

Celarnor 9y ago
It works fine except when it doesn't, which is most of the time (either secureboot, or the EFI boot manager, or the Windows 8+ "fast startup" thing that can turn itself on during an update and sets the EFI next-boot option, permanently overriding any GRUB selection until you turn it back off from inside Windows..) Compared to how hassle-free multiple operating systems is to do via legacy boot, UEFI feels incredibly backward. It feels unfinished, is fragile and breaks far too easily for something so critical. I'm not looking forward to it being taken away. Guess I'll have to ditch my other OSes and do my important work in a VM.
- josteink 9y ago
  > It works fine except when it doesn't That can be said about anything. > which is most of the time Not to come off snarky, but citation needed. > either secureboot, or the EFI boot manager What issues do they cause? Really? > Windows 8+ "fast startup" thing that can turn itself on during an update and sets the EFI next-boot option Clearly annoying, but easily fixed. I'd rather have this once a year than Windows deciding it has the right to write to my MBR, and overwrite GRUB, causing my Linux installation to be unbootable without a recovery-disk. > Compared to how hassle-free multiple operating systems is to do via legacy boot That may be true for multi-volume scenarios. For systems with one volume only however (like most laptops), it's absolute the opposite. > It feels unfinished, is fragile and breaks far too easily for something so critical My experience is quite the opposite. With UEFI I feel I can fearlessly dual/multi boot several operating systems without fear that one OS is going to mess up another one. And I know that if something happens once a leap year or so, EFI has proper tooling so it's easy to fix, unlike black-boxed MBR bootloaders and the hacks involved with chain-loading different OSes on top of them.