Booting the PREEMPT_RT kernel
Hello,
I am trying to build a netboot image (squashfs) of Debian Wheezy with
live-build which shall be used as nonpersistent remote bootable
live-system. Everything worked fine so far. Now I want to try the
PREEMPT patched linux-kernel installed by the metapackage
"linix-image-rt-amd64" from the Debian repository. Building the image
worked but I am not able to boot it on my testmachine. I got an error
message "mount overlay on /root/ failed with option -o...". I found some
conversation on the mailing list that state that there are problems with
the overlay filesystem (aufs) and the rt-kernel. Does anybody have some
more informations about the technical details or is there already a
solution for this?
I also tried Jessie with the backported rt-kernel which didn't work, but
stretch worked with the current rt-kernel (linux-image-4.4.0-1-rt-amd64)
so it doesn't seem to be generally impossible. Having a look at the
kernel configs the rt-kernel of wheezy hasn't set the "CONFIG_AUFS_FS"
option while the stretch rt-kernel doesn't even list this option but has
a option "CONFIG_OVERLAY_FS=m" set. If there is no solution to get the
rt-kernel from the Debian repository to work in a netboot image, is it
at least possible to use a custom build and PREEMPT patched kernel for
Wheezy if I set these options?
Thanks and best regards,
Christoph
________________________________
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
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