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#1 2012-04-28 18:29:31

dhave
Arch Linux f@h Team Member
From: Outside the matrix.
Registered: 2005-05-15
Posts: 1,112

[SOLVED] "efibootmgr -v" output question

When I use the "-v" (verbose) option for efibootmgr, I get some nice info about my uefi boot entries. I have one question, though.

Here's an example of the part of my "efibootmgr -v" output that corresponds to one of my boot entries:

Boot001D* Arch-SSD60    HD(1,800,200000,56203ae7-9129-430f-85c3-143ec253860e)File(\boot\efi\arch\vmlinuz-linux.efi)i.n.i.t.r.d.=.\.b.o.o.t.\.e.f.i.\.a.r.c.h.\.i.n.i.t.r.a.m.f.s.-.l.i.n.u.x...i.m.g. .r.o.o.t.=./.d.e.v./.d.i.s.k./.b.y.-.u.u.i.d./.c.4.e.7.c.a.d.8.-.1.8.a.6.-.4.2.d.2.-.a.a.d.d.-.0.d.e.f.5.f.0.7.7.1.1.f. .r.o. .q.u.i.e.t...

The info in parentheses following "HD" clearly pertains to my hard drive, but I'm confused about the "56203ae7-9129-430f-85c3-143ec253860e" string included there. That is *not* the UUID of any of the three partitions on that drive, nor is it the GUID of the hard drive itself.

It's obviously a UID of some sort, but I can't figure out what sort. Can anyone advise?

BTW, if there are other people on the steep part of the learning curve for UEFI booting, you'll probably find the -v option of efibootmgr to be helpful.

Thanks.

Last edited by dhave (2012-04-28 19:52:17)


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#2 2012-04-28 18:52:13

dhave
Arch Linux f@h Team Member
From: Outside the matrix.
Registered: 2005-05-15
Posts: 1,112

Re: [SOLVED] "efibootmgr -v" output question

Well, I think I found out something, anyway.

When I go into the UEFI shell, access the booting hard drive with "fs1:", then enter the command "map", I get a device mapping table. The string in question is the unique identifier for my booting hard drive. Since it's *not* the UUID of any partition nor the GUID of the disk itself, I don't know how that i.d. is assigned, but at least I can see a bit of what's going on.

I've read a fair amount about UEFI, but apparently I missed this bit of info.

Last edited by dhave (2012-04-28 18:53:05)


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#3 2012-04-28 18:55:03

dhave
Arch Linux f@h Team Member
From: Outside the matrix.
Registered: 2005-05-15
Posts: 1,112

Re: [SOLVED] "efibootmgr -v" output question


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#4 2012-04-28 18:59:33

the.ridikulus.rat
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From: Indiana, USA
Registered: 2011-10-04
Posts: 765

Re: [SOLVED] "efibootmgr -v" output question

https://bbs.archlinux.org/viewtopic.php … 4#p1083424

EDIT: It is the Unique GUID/UUID of the partition in the GPT table.

Last edited by the.ridikulus.rat (2012-04-28 19:03:18)

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#5 2012-04-28 19:51:50

dhave
Arch Linux f@h Team Member
From: Outside the matrix.
Registered: 2005-05-15
Posts: 1,112

Re: [SOLVED] "efibootmgr -v" output question

the.ridikulus.rat wrote:

https://bbs.archlinux.org/viewtopic.php … 4#p1083424

EDIT: It is the Unique GUID/UUID of the partition in the GPT table.

You're right. Thanks. I finally found it as "Partition unique GUID" when I requested detailed partition info using gdisk. Too bad it doesn't correspond to the blkid of the partition. I guess that would be too simple.

Thread marked "solved".

Last edited by dhave (2012-04-28 19:52:42)


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#6 2012-04-29 11:23:12

the.ridikulus.rat
Member
From: Indiana, USA
Registered: 2011-10-04
Posts: 765

Re: [SOLVED] "efibootmgr -v" output question

dhave wrote:

I finally found it as "Partition unique GUID" when I requested detailed partition info using gdisk. Too bad it doesn't correspond to the blkid of the partition. I guess that would be too simple.

You are talking about FSUUID which is given by

blkid  -o value -s UUID /dev/sda3

The PARTUUID (Unique GPT GUID) of the partition is given by (enabled by "blkid -p" option)

blkid -p  -o value -s PART_ENTRY_UUID /dev/sda3

Last edited by the.ridikulus.rat (2012-04-29 11:29:49)

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#7 2012-04-30 04:32:24

dhave
Arch Linux f@h Team Member
From: Outside the matrix.
Registered: 2005-05-15
Posts: 1,112

Re: [SOLVED] "efibootmgr -v" output question

the.ridikulus.rat wrote:
dhave wrote:

I finally found it as "Partition unique GUID" when I requested detailed partition info using gdisk. Too bad it doesn't correspond to the blkid of the partition. I guess that would be too simple.

You are talking about FSUUID which is given by

blkid  -o value -s UUID /dev/sda3

The PARTUUID (Unique GPT GUID) of the partition is given by (enabled by "blkid -p" option)

blkid -p  -o value -s PART_ENTRY_UUID /dev/sda3

Thank you! I didn't know about PARTUUID. That's very helpful.


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