Root filesystem is not mounted at boot,

Lomig · 12-19-2020, 01:55 AM

Hi.

LFS Version : 10 SysVInit
Hard disk : Samsung Portable SSD T5

I try to boot on my LFS since 2 days, but I got a problem with the root filesystem mount

When I boot, It was stopping, saying the disk supposed to contain the root filesystem does not exist. I had to do a Ctrl-C to get a prompt. So I made another compilation of the kernel, putting

Code:

Device Drivers
[*] USB Support
____<*> xHCI*HCD (USB 3.0) support 
____<*> USB Mass Storage support
____<*> USB Type-C Support
NVME Support 
____<*> NVM Express block device
____[*] NVMe multipath support

that were before compiled as module
I precise that I tried With USB Type C and USB 2.0 on the mainboard, the result is the same

By doing this the boot doesn't stopped, I got a prompt, but It seem the error message appears quickly, but I am not sure. But when I do

Code:

sh5.0# mount
none / roofs

* For /proc, /sysfs /dev they are mounted
* /usr/bin is a link to /bin
* no /var

Here is my /boot/grub/grub.cfg

Code:

set default=0
set timeout=5

insmod ext2
set root=(hd0,2)

menuentry 'GNU/Linux Gwen Erminig', Linux 5.8.3-gwen-erminig-9  {
	echo	'Chargement : Linux 5.8.3-gwen-erminig-9 ...'
	linux	/vmlinuz-5.8.3-gwen-erminig-9 root=UUID=09005fe5-0f72-4967-8bf9-ec5e13d6ef83 ro  
	echo	'Chargement : initial ramdisk ...'
	initrd	/initrd.img-5.8.3-gwen-erminig-9
}

and my /etc/fstab

Code:

/dev/sda4	/		ext4		defaults		1	1
/dev/sda2	/boot		ext2		defaults		1	1
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

I didn't put UUID in fstab, but when I try a mount /dev/sda4 in a test folder, there is no problems.

Hope you can help me.
Thanks

lougavulin · 12-21-2020, 06:15 PM

Hello,

Did you check that the UUID in grub.conf match /dev/sda4's UUID ?

arch-linq · 12-23-2020, 11:42 AM

Shouldn't mix device names uuid's during boot. Use device names in grub.cfg and fstab.
If you want uuid's you will need an initramfs and use gpt. It's all explained in arch wiki -grub and blfs Sec5. There's more I can say but new builders overcomplicate their setups and get your scenario. I don't unravel issues that happen due to poor research and bad decisions on setups. Noobs just get more confused.

A first time builder should use a spinner hdd on real hardware not a vm, mbr for partitions like sda1 as / and sda2 as swap. Then you build a simple kernel per book install grub to /dev/sda and viola ya get lfs booted easily.