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did you install the mint 19 distro first or did you only load the kernel into debian9

Does the machine still boot with the earlier kernel selected?
What was that kernel?

Have you tried running a pre-compiled kernel package?
Does Mint find any such realtime kernels in the package manager? If not then you could try adding the debian 9 repositories to see what you can find.

The kernel panic hints that something went wrong during your kernel compile.
Out of interest, how long did you have to wait after the "make" command, and were there any error messages generated?

andypugh wrote: Does the machine still boot with the earlier kernel selected?
What was that kernel?

I want to say I didn't even see options for the old kernel. I'll report back on this asap.

andypugh wrote: Have you tried running a pre-compiled kernel package?
Does Mint find any such realtime kernels in the package manager? If not then you could try adding the debian 9 repositories to see what you can find.

Honestly I didn't even think to look in the repos for a precompiled kernel. It didn't occur to me that would be an option. Does anyone happen to know if the rt-preempt kernel is available in the mint 19.1 repos? If I can quickly get this install repaired I'll look for it, otherwise I'll just go back to a linuxcnc iso.

andypugh wrote: The kernel panic hints that something went wrong during your kernel compile.
Out of interest, how long did you have to wait after the "make" command, and were there any error messages generated?

I don't know. From previous experience I didn't bother waiting around to find out. I went to bed and when I came back there were no error messages on the terminal at that time.

I feel like you've asked lots of good questions and I've had zero helpful answers. I'll explore grub more thoroughly and see if another kernel will load and report back.

Linuxmint 19.1 when compiling now compiles and installs all modules and keeps symbols making the image way too big so it cant boot.

You have to strip the symbols and compile it so just the modules required. check the image compared to the original, it will probably be like 10 times bigger.

I tried all kinds of stuff to fix it and couldn't get it to compile small enough.

So I installed debian 9. it has preempt RT kernel in the repo. But this has watchdog reboot issue.

Would be nice and very appreciative if some kernel guru on here and help us on how to configure so the kernel is a decent size so grub will load it.

bevins wrote: Linuxmint 19.1 when compiling now compiles and installs all modules and keeps symbols making the image way too big so it cant boot.

You have to strip the symbols and compile it so just the modules required. check the image compared to the original, it will probably be like 10 times bigger.

I tried all kinds of stuff to fix it and couldn't get it to compile small enough.

So I installed debian 9. it has preempt RT kernel in the repo.

I'm curious, did you try to install the preempt kernel from the debian repo into your mint installation? I gather that was what andypugh was suggesting here "Does Mint find any such realtime kernels in the package manager? If not then you could try adding the debian 9 repositories to see what you can find."