linux-kernel - Weirdness with EFI boot and partition tables...

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Date:	Wed, 28 Aug 2013 20:49:01 -0400
From:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:	linux-kernel@...r.kernel.org
Subject: Weirdness with EFI boot and partition tables...

So I'm trying to debug a problem with my Dell Latitude booting in EFI
mode, that looks like a "can't find the initrd", when I stumbled across this:

<4>[    2.831325] VFS: Cannot open root device "mapper/turing--police-froot" or unknown-block(0,0): error -6
<4>[    2.831329] Please append a correct "root=" boot option; here are the available partitions:

<4>[    2.831338] 0800       488386584 sda  driver: sd
<4>[    2.831344]   0801          305368 sda1 5288e82d-f5e3-4f57-a7f9-e29f87149240
<4>[    2.831348]   0802         3150112 sda2 42eb87e8-1e6a-477e-8b66-2255ac98b27d
<4>[    2.831351]   0803          512000 sda3 6c7a5919-61bc-498e-b26a-9c2aa27e65d1
<4>[    2.831355]   0805       293795840 sda5 52e421a3-78df-48ac-877f-9362b50af20f
<4>[    2.831358]   0806         4100096 sda6 ebaf21a2-a1aa-4685-8788-e962b6aad18c
<4>[    2.831364] 0b00         1048575 sr0  driver: sr

Note the entry for sda6.  Boot a Fedora kernel, and:

# fdisk -l /dev/sda
WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

Disk /dev/sda: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: gpt


#         Start          End    Size  Type            Name
 1        16072       626807  298.2M  Linux filesyste Linux filesystem
 2       626808      6927031      3G  Microsoft basic Microsoft basic data
 3      6928384      7952383    500M  Linux filesyste Linux filesystem
 5      7954432    595546111  280.2G  Linux LVM       Linux LVM
 6    595546112    976773134  181.8G  Linux LVM       Linux LVM


Any ideas why the size discrepancy?

(No, this probably not relevant to my original issue - my root is on the
LVM on sda5, which is OK, and the problem is the initrd doesn't fire up at all)


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