I'd installed, to be more precise: 1. Extracted all sets that I want in root. 2. Configured, /etc/fstab and /etc/rc.conf (missing something ?) 2. Pointed GRUB2 of Arch Linux to load NetBSD kernel.
after this kernel is loaded correctly, but theres a problem in mount root device, tried --root=/dev/Vol0/netbsd and --root=Vol0/netbsd and no success. I think that the problem is because the LVM module (dm ?) isn't loaded earlier root mount. On linux it can be done adding module to initrd/initramfs on FreeBSD can be done recompiling kernel. So I think for boot correctly a I've to recompile NetBSD kernel with LVM module, if I'm correct, is possible compile NetBSD kernel from linux or from FreeBSD ? obviously if have other way of LVM module be loaded earlier root mount instead of recompile kernel will be great!
