VFS: Cannot open root device "(null)" or unknown-block(0, 0): error -2
valdis.kletnieks at vt.edu
Sat Aug 14 20:21:00 EDT 2021
On Fri, 13 Aug 2021 18:08:38 -0600, jim.cromie at gmail.com said:
> then I added BTRFS_FS, since thats the host fs.
> of course it didnt work.
> VFS: Cannot open root device "(null)" or unknown-block(0,0): error -2
> Please append a correct "root=" boot option; here are the available partitions:
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.14.0-rc4+ #5
And it didn't find any usable btrfs (or other fs it knew about)
> Heres a working kernel (if overlarge config)
> VFS: Mounted root (9p filesystem) readonly on device 0:20.
> Anybody see any clues ?
That '9p filesystem' should be a really big clue. If that's the root fs that you
actually want to use, you need to do two things:
a) point at it with root=
b) have 9p filesystem support in the kernel
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