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Joined: 19 Nov 2006
Posts: 946
Location: Greece

PostPosted: Sat Jan 16, 2016 4:14 pm    Post subject: [SOLVED]Pure UEFI Boot Reply with quote

Hello there,

I am trying to have a pure UEFI boot with my new laptop, but I end up having the infamous
kernel panic-not syncing: VFS: unable to mount root fs on unknown block(0,0)

That being said, I am having the image properly found.

The root partition is /dev/sda2 and the kernel image is in /dev/sda1.
$  parted /dev/sda
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                           
Model: ATA SAMSUNG MZNLF128 (scsi)
Disk /dev/sda: 128GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End    Size   File system  Name    Flags
 1      1049kB  135MB  134MB  fat16        boot    boot, esp
 2      135MB   128GB  128GB  ext3         rootfs


Also my kernel configuration, if that is relevant:

Is it possible to have Gentoo running without the help of GRUB, reFIND or these other tools?

EDIT#1: Forgot to add root=/dev/sda2 to CONFIG_CMDLINE...
"Nolite arbitrari quia venerim mittere pacem in terram non veni pacem mittere sed gladium" (Yeshua Ha Mashiach)
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Joined: 09 Dec 2006
Posts: 7608
Location: Goose Creek SC

PostPosted: Sat Jan 16, 2016 5:48 pm    Post subject: Reply with quote

The kernel cannot find the root partition.
appears in your .config which tells that you did not elect to tell the kernel where to find the root partition inside the kernel. Recommend doing so as the simplest and most reliable way to specify the root partition location.
Prceed as follows: Boot the install media and the gentoo partitions and enter the chroot. .run
which will return something like
/dev/sda2: LABEL="somelabel" UUID="someUUID" TYPE="ext3" PARTUUID="somePARTUUID"

Of interest is the PARTUUID which the kernel can use.
In the chroot:
cd /user/src/linux;make menuconfig
Edit menuconfig to include:
Processor type and features --->
[*] Built-in kernel command line
(root=PARTUUID=aaaa-1111-bbbb-2222 ro) Built-in kernel command string
[*] Built-in command line overrides boot loader arguments
then run
make && make modules_install && make install
exit the chroot and reboot

aaaa-1111-bbbb-2222 is an example, replace with your PARTUUID value for /dev/sda2; NO parens
Defund the FCC.
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