Arrgh!  I've just pulled down today's latest sources (well, about 1900GMT 
this evening) and rebuilt my kernel (trying to fix that kernel problem I 
posted about yesterday).

The kernel won't boot.  It dies somewhere very early on in the bootstrap 
sequence (probably not long after printing out the memory bank 
information, but I can't be sure since the screen goes blank).

I do get the whinge about not having upgraded my bootloader, but I don't 
want to do that, since I'm still occasionally wanting to boot an old 
kernel.

Also, the text that does get printed seems to shimmer on the monitor quite 
a bit -- nothing like as stable as it was.

Any clues?

R.