Re: Need help with Booting to LFS

On 9/13/25 03:32, Xi Ruoyao ([email protected] via lfs-support Mailing 
List) wrote:

> On Sat, 2025-09-13 at 02:54 -0500, Bruce Dubbs wrote:
>> This should have been sent to LFS-support.
>>
>> On 9/13/25 1:31 AM, Vansh Mittal wrote:
>>> Hello,
>>>
>>> I recently completed building *LFS 12.3 (sysv)* by following the book instructions,
>>> but I am stuck at the final step: booting into the LFS system.
>>>
>>> On boot, I get the following error:
>>>
>>>> /dev/root: can't openblockdev |
>>> My setup:
>>>
>>>    *
>>>
>>>      Booting via *UEFI*
>>>
>>>    *
>>>
>>>      Using an *NVMe SSD*
>>>
>>>    * Host*- 22.04 ubuntu*
>>>
>>> I have already checked the FAQ and tried the suggested fixes, but the issue persists.
>>>
>>> I tired getting help from LinuxQuestions but nothing fixed the issue. I think the
>>> issue is in kernel config but i cant figure it our
>>>
>>> For reference, I have uploaded my *GRUB config, fstab, and kernel .config* here:
>>> https://drive.google.com/drive/folders/1jW1_ulSu0qupzM5N4Qv1p0Yxqi67hjof<https:// 
>>> drive.google.com/drive/folders/1jW1_ulSu0qupzM5N4Qv1p0Yxqi67hjof>
>>>
>>> Could you please take a look and suggest what I might be missing or misconfigured?
> See
> https://lists.linuxfromscratch.org/sympa/arc/blfs-support/2025-09/msg00017.html
> for some hints.

  The LFS grub.cfg has:

cat > /boot/grub/grub.cfg << "EOF"
|# Begin /boot/grub/grub.cfg set default=0 set timeout=5 insmod part_gpt 
insmod ext2 set root=(hd0,2) set gfxpayload=1024x768x32 menuentry 
"GNU/Linux, Linux 6.16.1-lfs-r12.4-16" { linux 
/boot/vmlinuz-6.16.1-lfs-r12.4-16 root=/dev/sda2 ro }|
EOF

Note "insmod ext2" in it?

You may need:

CONFIG_EXT4_USE_FOR_EXT2=y


Note that I have this, and it works:

#
# File systems
#
CONFIG_DCACHE_WORD_ACCESS=y
CONFIG_VALIDATE_FS_PARSER=y
CONFIG_FS_IOMAP=y
CONFIG_FS_STACK=y
CONFIG_BUFFER_HEAD=y
CONFIG_LEGACY_DIRECT_IO=y
# CONFIG_EXT2_FS is not set
# CONFIG_EXT3_FS is not set
CONFIG_EXT4_FS=y
CONFIG_EXT4_USE_FOR_EXT2=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
# CONFIG_EXT4_DEBUG is not set
CONFIG_JBD2=y
# CONFIG_JBD2_DEBUG is not set
CONFIG_FS_MBCACHE=y
CONFIG_JFS_FS=m
CONFIG_JFS_POSIX_ACL=y

I also have the following because I have a removable NVME on that 
interface on one machine:

CONFIG_SATA_AHCI=y

-- 
http://lists.linuxfromscratch.org/sympa/info/lfs-support
Unsubscribe: See the above information page