System requirements - Was: Out of Space

[Oliver Grawert]

hi,
On Mi, 2016-08-10 at 13:37 +0200, Ralf Mardorf wrote:
> On Wed, 10 Aug 2016 13:02:49 +0200, Oliver Grawert wrote:
> > 
> > hi,
> > Am Dienstag, den 09.08.2016, 22:33 +0200 schrieb Oliver Grawert:
> > > 
> > > hi,
> > > On Di, 2016-08-09 at 20:14 +0200, Ralf Mardorf wrote:  
> > ...
> > 
> > oh, and who brought up that myth that the BIOS would have anything
> > to
> > do with being able to GPT boot or not? 
> > 
> > it definitely has not ... thats a bootloader thing ...
> 
> https://lists.ubuntu.com/archives/ubuntu-users/2016-August/286767.htm
> l

hmm, yeah ... 

the MBR always needs *some* first stage bootloader in the first 440
bytes to have a bootable system at all (grubs stage 1 blob, the windows
bootloader, open firmware, coreboot, uboot or whatever other thing)
... 
even if you boot off a partition that holds the second stage ...

an MBR is 512 bytes big and the partition table only starts at byte 446
...

while windows can *only* boot from GPT when in UEFI mode, linux can
boot from whatever partition table you want ...

the partition table handling is a matter of the bootloader and the OS,
not a matter of BIOS or UEFI, though if you have a dual boot with
windows you re indeed enforced to use GPT with UEFI to keep the windows
side functional. the same thing goes for secure boot scenarios where
GPT is a requirement
... 
but a default linux-only boot can use any combo here.

ciao
	oli
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