Hey Dave!

 DV> If you want to be really adventurous try using the PiLFS
 DV> instructions to build LFS 5.0 ..

Not that I know for sure since I never actually read the PiLFS instructions,
but I am guessing it would take a bunch of very serious edits since it would
take older version of glibc which would require an older version of gcc which
may or may not have the needed patches for getting it all to run on an arm64.

 DV> I wonder if a 2.4 kernel would run on a Pi3 ..

Not without a great deal of pain.  Other than getting a purely C based system
going ala gcc-4.7 or older, what would be the incentive?

For the record I did try this targetting pure 32 bit x86 recently.  Also back
when gcc-4 first hit the scene I believe I had a pure 64 bit system going then
so it seems to me to be doable.  However I still question the incentive for
doing this at this point in time.

Life is good,
Maurice

... Don't cry for me I have vi.
--- GNU bash, version 4.4.12(1)-release (x86_64-silvermont-linux-gnu)