Re: VFS: Cannot open root device

On Fri, 2025-09-05 at 11:15 +0000, Cliff mcDiarmid wrote:
> 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

>Here the lines you replaced with "etc etc" are important, look at them
>carefully. We enabled DRM panic and VESA framebuffer in LFS
>specifically to make the kernel able to show them clearly on such a
>"cannot open root device."

>Possibilities are you incorrectly changed CONFIG_EXT4 to M, incorrectly
>changed CONFIG_NVME to M, incorrectly turned off CONFIG_EFI_PARTITION,
>or you have two NVME disks and their numbering changed between two
.boots.

Thanks Xi

It was the CONFIG_NVME.  Not configured at all.  How does that happen?

Anyway that seems the least of the problems now.   I've got a desktop that
crashes in 30sec back to login and no wifi!   Will probably return to vanilla
kernel.   May need another thread

Cliff

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