Hi, I faced the same problem yesterday and solved it by taking the kernel of debian testing.
I took the kernel deb file and the corresponding aufs-modules deb (not sure if this was needed) and installed it in the nfsroot (mount proc, dev, sys,...; chroot ...). I then copied the kernel and initrd files from $NFSROOT/boot to /srv/tftp/fai and updated the pxe boot configs. We also have our own debian ubuntu repositories where we added some deb files and now a custom vanilla kernel that is installed by the fai-clients, so that the installed system can boot with network support. BTW. we had a lot of 'SOFT LOCKUP' problems with kernel versions < 2.6.28, on SuperMicro systems, caused by multi-threaded programms (especially on recent Opterons but also on recent Nehalem Xeons). So far everything works fine for us. Chriss
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