Re: [gentoo-user] ...recreating exactly the same applications on a new harddisc?

[Marc Joliet <marcec@gmx.de>]

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Am Dienstag, 7. April 2020, 01:38:01 CEST schrieb Michael:
> On Monday, 6 April 2020 22:15:20 BST Neil Bothwick wrote:
> > On Mon, 6 Apr 2020 22:02:04 +0100, antlists wrote:
> > > > This isn't strictly true, the ESP must be vfat, but you can still
> > > > have an ext? /boot.
> > >
> > > This isn't true at all - you've got the cart before the horse. The
> > > original (U)EFI spec comes from Sun, I believe, with no vfat in sight.
> > >
> > > A standards-compliant factory-fresh Mac boots using UEFI with no vfat
> > > in sight.
> >
> > That's true, but firmware on commodity PC motherboards can only be relied
> > upon to handle vfat. So while my use of "must" is a bit strong, it should
> > be vfat if you want to be sure it will boot on a PC.
>
> Perhaps older UEFI specifications allowed Mac-baked filesystems, or perhaps
> Apple were/are doing their own thing.  The current UEFI specification
> *requires* a FAT 12/16/32 filesystem type on an ESP partition to boot an OS
> image/bootloader from - see section '13.3 File System Format':
>
> https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf
>
> I can't recall the ESP partition format last time I installed and
> dual-booted Linux on a MacBookPro, c.2014, but I'd wager it was VFAT.

I checked my 2007 Mac Mini and its ESP is vfat.  Of course, newer Macs or
other models might use something else.

--
Marc Joliet
--
"People who think they know everything really annoy those of us who know we
don't" - Bjarne Stroustrup

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