Bug#357538: grub is a work-around
I can now confirm that I can start the 2.6.15 kernel after switching the
loader to grub.
Note that the default setup of grub (with update-grub) uses raw disk
devices for the name of the root partition. I modified it as in the
second line below
# kopt=root=/dev/scsi/host0/bus0/target0/lun0/part8 ro
# kopt_2_6=root=/dev/evms/newroot ro
so that things worked right. I believe that with the default the same
problem (root device not recognized as evms) would recur.