Re: Moving from a "686-pae" kernel to "amd64"?
I did exactly that several years ago with no problem.
I installed an amd64 kernel at which point grub knew about both.
Changed default boot to the new kernel and ran for a while. Once all
was well I uninstalled the pae kernel.
I did it mostly because I expect that amd64 is the dominant kernel in
the future.
Although I haven't needed to, I believe I could add 64 bits as a
foreign architecture if I wanted to run a 64 bit process.
What appears to be too hard to contemplate is changing the base
process architecture to 64 bits.
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