Does the machine run Debian natively?
Yes.
Is there a Debian kernel you can use in your LAVA submissions (with modules and ramdisk)?
No.
Yes, however, to debug what is going on, you should switch to known working files so that you have a valid comparison with known working test jobs.
I couldn't find such files. Though I have files that I could load manually (from iPXE console as in first letter or from USB flash drive).
rootfs.cpio.gz does not exist when the machine boots.
Before that I have tried `rootfs.cpio`. In manual runs I have entered " imgargs bzImage console=ttyS0,115200n8 initrd=/rootfs.cpio root=/dev/ram0" into iPXE console and that works.
/dev/ram0 shouldn't be needed with modern kernels.
My kernel is 4.10.4.
At best, it would seem that these options are ignored.
Without that option I couldn't load kernel even manually.
Running x86_64-nfs.sh in an empty directory will provide access to the config of the kernel itself as well as the initramfs and supporting tools.
Thank you very much. I will try.