This is partially related to bug 99449. The fact that you have to add "dolvm2" to get botting via genkernel to work is undocumented (either in the manpage or the Gentoo LVM2 HOWTO) Also, the volume in question must be passed via "real_root", and not the "root" parameters as normal (real_root would seem to be deprecated for iniotramfs anyway, as the initramfs is transpartent, and no "pivot_root games" need to be played). In other words, this has to be done: kernel /kernel-genkernel-x86-2.6.17-gentoo-r4 real_root=/dev/Gentoo/root dolvm2 Instead of: kernel /kernel-genkernel-x86-2.6.17-gentoo-r4 root=/dev/Gentoo/root dolvm2 Note the latter forms works with regular (/dev/hdax) volumes A similar paralell probably exists for evm2, as well. There are both http://gentoo-wiki.com/HOWTO_Install_Gentoo_on_an_LVM2_root_partition and lots of recent threads in the forums pointing to that, even though genkernel already has this capability; its just not documented!
Considering genkernel itself *tells* you that you need dolvm2 when you use --lvm2, I think this isn't as much of a "bug" as it is the user not reading the directions on-screen. The LVM2 guide does not cover genkernel in any way, so a bug would need to be filed with the guide's maintainers to ask them to add genkernel information. The man page does need a lot of work, as it is quite out of date. Feel free to attach a patch for the man page and we'll get it updated.
Created attachment 93618 [details, diff] Document "dolvm2" and "doevms2" in manpage This patch isn't as asthetically pleasing as I'd hoped, but it gets the job done
Created attachment 93619 [details, diff] Allow "root=" instead of "real_root=" for initramfs Since the initramfs is transparent, root= can be used instead of real_root= (which is now what is recommended for regular volumes) this patch extends this to all kinds of volumes. It tests for initrd by checking if REAL_ROOT is /dev/ram0 or not.
Fixed in 3.4.3
