Tauno Voipio wrote on 3/27/21 5:13 PM:

> Just a guess: the built-in file system starts up before
> the /proc filesystem is mounted.

Still doesn't explain why the exact same options are working on a x85-64 system

>
> You should return to a module and set it up into the initrd.
>
on my laptop (t430) I'm using slackwares Kernel, which has almost everything
compiled in,
there's no initrd, there  root (/) is on a btrfs and /proc is fine.
  So I'm guessing I may miss some 'helper' / glue option in the kernel config
to make this work as
builtin ... (I don't like initrds as I tend to forget to update them :-) )

     -rasp

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