Hello lfs support community!
I have recently went through the majority of the lfs book, and up until
the final step, everything has gone great. At every opportunity I tested
the system, and did not experience and serious issues. However, I am
now having problems with the final step of rebooting the system.
Namely, my
problem is that after the grub menu is loaded, I am greeted by a black
screen filled with text and a message stating:
VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
Before sending this email, I checked FAQ and found this:
Kernel panic: VFS: unable to mount root fs
There are several reasons why the kernel might be unable to mount
the root filesystem.
- Did you specify the correct partition in /boot/grub/menu.lst?
- Is support for the hard drive enabled in the kernel. For SCSI
this means support for the specific SCSI adapter.
- Is support for the hard drive compiled into the kernel, not
just
as a module. (Modules are stored on the filesystem. If a driver needed
to access the filesystem is stored as a module on that filesystem, well
... you know ... ;)
- Is support for the filesystem compiled into the kernel. Again,
not a module. Support for ext2 is enabled by default, but others like
ext3, reiser, jfs, and xfs are not.
To address the first point, I am fairly certain I specified the correct
partition in /boot/grub/grub.cfg (above it is written menu.lst but I
suppose that is a minor detail). I am booting from a uefi system.
Because of this, to set up grub I followed the hint at
http://www.linuxfromscratch.org/hints/downloads/files/lfs-uefi.txt.
To address the 2nd through 4th points I tried numerous setups of the
kernel. I followed the setup exactly from the hint above, I copied
.config file of my home system, and I even tried enabling all options
through the make allyesconfig command while disabling "support for
uevent
helper". So far, no luck.
Below is all the relative information I could think of to solve the
problem. Please let me know if I should provide something else. From
here, I have really no idea how to precede. So any suggestions would
be very welcome.
Cheers,
John David
This is my grub.cfg file...
# Begin /boot/grub/grub.cfg
set default=0
set timeout=5
insmod gzio
insmod part_gpt
insmod ext4 #I tried ext2 there also, did not work...
set root=(hd0,gpt4) #I tried this without the gpt, still no result
# hd[x] is the drive of the LFS partion and gpt[y] is the partition
insmod efi_gop
insmod efi_uga
insmod font
if loadfont /grub/unicode.pf2; then
loadfont /grub/unicode.pf2
set gfxmode=auto
insmod gfxterm
set gfxpayload=keep
terminal_output gfxterm
fi
menuentry "GNU/Linux, Linux 4.9.9-lfs-8.0" {
linux /boot/vmlinuz-4.9.9-lfs-8.0; root=/dev/sda4 ro #I tried
sda4 and hda4 here...
}
Here is my etc/fstab file. As you can see, the there is a uefi
partition.
# Begin /etc/fstab
# file system mount-point type options dump fsck
# order
/dev/sda4 / ext4 defaults 1 1
/dev/sda3 swap swap pri=1 0 0
proc /proc proc nosuid,noexec,nodev 0 0
sysfs /sys sysfs nosuid,noexec,nodev 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /run tmpfs defaults 0 0
devtmpfs /dev devtmpfs mode=0755,nosuid 0 0
/dev/sda1 /boot/efi vfat defaults 0 1
efivarfs /sys/firmware/efi/efivars efivarfs defaults 0 1
# End /etc/fstab
This is from the fdisk -l command. dev/sda4 is my LFS partition
Disk /dev/loop0: 80.5 MiB, 84393984 bytes, 164832 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop1: 79.5 MiB, 83349504 bytes, 162792 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/loop2: 79.5 MiB, 83349504 bytes, 162792 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 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
Disklabel type: gpt
Disk identifier: 81486A44-3CDC-49E2-8B1B-E52C0A0596D6
Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 1834608639 1833558016 874.3G Linux filesystem
/dev/sda3 1937008640 1953523711 16515072 7.9G Linux swap
/dev/sda4 1834608640 1937008639 102400000 48.8G Linux filesystem
And finally, this is from lshw...
striker1
description: Notebook
product: Inspiron 7559 (0706)
vendor: Dell Inc.
version: 1.2.0
serial: CWY6KD2
width: 64 bits
capabilities: smbios-3.0 dmi-3.0 vsyscall32
configuration: boot=normal chassis=notebook family=Inspiron
sku=0706 uuid=44454C4C-5700-1059-8036-C3C04F4B4432
*-core
description: Motherboard
product: 0H0CC0
vendor: Dell Inc.
physical id: 0
version: A00
serial: .CWY6KD2.CN4864367J01Z8.
slot: Inspiron
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