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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] UEFI booting
Date: Fri, 26 Aug 2016 12:33:47 +0100
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On Friday 26 Aug 2016 09:32:25 Peter Humphrey wrote:
> Hello list,
>=20
> In my search for a suitable boot method, I'm trying Mike G's systemd-=
boot
> ebuild. I've installed it with no problem, and now I reach the heart-=
in-
> mouth stage of actually replacing gummiboot with it. But first, the b=
ackup,
> including dd of what used to be called the MBR (what is it now?).
>=20
> # parted -l
> Model: Unknown (unknown)
> Disk /dev/nvme0n1: 256GB
> Sector size (logical/physical): 512B/512B
> Partition Table: gpt
> Disk Flags:
>=20
> Number  Start   End     Size    File system     Name       Flags
>  1      1049kB  3146kB  2097kB                  uefi       bios_grub
>  2      3146kB  144MB   141MB   fat32           boot       boot, esp
>  3      144MB   4504MB  4360MB  linux-swap(v1)  swap
>  4      4504MB  15.0GB  10.5GB  ext4            rescuesys
>  5      15.0GB  32.2GB  17.2GB  ext4            gentoo
>  6      32.2GB  36.5GB  4295MB  ext4            var
>  7      36.5GB  45.1GB  8590MB  ext4            home
> [...]
>=20
> That start block of the uefi partition looks odd to me.=20

The 'Name' of the 1st partition is the label you have provided when you=
=20
created it.  It is NOT the type of the partition, which is shown under =
the=20
'Flags' column as 'bios_grub'.  The 1st partition was created to accomm=
odate=20
Grub's boot code.   It starts on the first cylinder (change the units i=
n parted=20
to cyl and you'll see it starts at '0 cyl') and has no fs on it.

> I'm pretty sure I
> didn't specify a start position to parted when I was constructing the=

> partition layout six months ago, preferring to let the program choose=
 a
> value itself.=20

Parted and friends will create this partition for Grub at the very star=
t of=20
the disk, when you use GPT.  If you stay with a conventional msdos part=
ition=20
table, then the first partition starts at cylinder 63 allowing enough s=
pace for=20
MBR to store its boot code in the unallocated cylinders 0 to 62.


> I do remember, though, that parted had a strange idea of what
> 2MB meant: it's turned out to be 2097kB.

You are mixing decimal and binary.  2MiB =3D 2 x 1024^2 =3D 2,097,152


> My question for the panel is whether I need to do anything about that=

> partition layout. What do you think?

You don't have to do something about it, if you want to retain the abil=
ity to=20
use Grub.  If you will no longer use grub then you probably do not need=
 the=20
first grub-specific partition. =20


As shown above the second partition is your EFI partition. 141MB may no=
t be=20
enough to store many kernel images, but it depends on how many kernel i=
mages=20
and initramfs you keep in there at any time.

=2D-=20
Regards,
Mick
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