I revived UML/x86_64 by fixing the bugs that had me stymied the last time I
looked at it. It's not in mainline yet, but you can get a working UML by
taking stock 2.6.12-rc3, and adding the incrementals up to and including
skas0 (see http://user-mode-linux.sf.net/patches.html - you'll see a note to
x86_64 users in the skas0 comments).
Feel free to keep adding incrementals, but I'm pretty sure that some of the
later ones need x86_64 stuff that isn't there yet.
As for a filesystem to boot, I used UML to build an LFS filesystem, and that
filesystem is available for now at
http://www.user-mode-linux.org/~jdike/lfs-x86_64.ext3.bz2
It weighs in at 222M, compressed, and expands to 1G. It's fairly minimal,
focussing on development tools, but light on everything else.
I boot it as follows:
./linux ubd0=lfs-x86_64.ext3 mem=2G devfs=nomount umid=lfs con1=none
con=pts con0=fd:0,fd:1
It has some udev issues. The block devices and ttys don't show up, so I
fiddled the udev rc script to just unpack a tar file with them in it. It will
appear to hang at udev, but fear not, as it just takes a while and continues
booting.
Jeff
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