Re: Debian 7 and UEFI/GPT
Bret Busby a écrit :
>
> So, now, what happens when one operating system is installed via
> UEFI/GPT, and two are installed as BIOS/MBR, in terms of wanting to be
> able to select any one of the three operating systems, to boot?
Nothing special. Depending on its settings and priorities, the firmware
will choose one scheme. If a firmware boot menu is available, you may be
able to choose any available boot loader.
> If I try to do something, to fix it, from one of the BIOS/MBR systems,
> will that eradicate the UEFI/GPT system, or, do other harm, and,
> conversely, if I do something from the UEFI/GPT direction, what will
> that do, to the BIOS/MBR systems?
Legacy and UEFI bootloaders can co-exist on the same disk.
The UEFI bootloaders are on the EFI system partition ; the legacy
bootloader is in the MBR (and in a BIOS boot partition if GPT format is
used).
> And, can UEFI/GPT systems, see BIOS/MBR installed opperaimg systems,
> and, can BIOS/MBR installed operating systems, see UEFI/GPT operating
> systems?
Systems, maybe [1]. Bootloaders, no.
[1] The UEFI bootloader of a GNU/Linux system may be able to boot
another GNU/Linux system installed in legacy mode. But it will do so by
loading directly the kernel and intramfs instead of chainloading the
legacy bootloader. And vice versa. A bootloader can only chainload
another bootloader of the same type.
Reply to: