VFS: Cannot open root device

Hello

I've never had any issue so far recompiling the kernel for LFS.   Still
there's always a first.

After enabling some modules in an existing kernel(6.12.5) I get the following
error when rebooting:

VFS: Cannot open root device
"/dev/nvme0n1p4" or unknown block (0,0): error -6
Please append a correct "root=" boot option
List of of all bdev filesystems  etc etc

I don't know what's supposed to have changed.   I checked the partition for
errors  with gparted all ok

My grub.cfg:

# Begin /boot/grub/grub.cfg
set default=0
set timeout=5

insmod part_gpt
insmod ext2
set root=(hd0,gpt4)

insmod efi_gop
insmod efi_uga
if loadfont /boot/grub/fonts/unicode.pf2; then
  terminal_output gfxterm
fi

menuentry "GNU/Linux, Linux 6.12.5-lfs15-12.2" {
   linux  /boot/vmlinuz-6.12.5-lfs-12.2 root=/dev/nvme0n1p4 ro
}

menuentry "Firmware Setup" {
  fwsetup
}

Any ideas anyone.  Thanks

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