Release ISOs

> there have been docs for building bootable CD's for ages at 
> http://www.netbsd.org/docs/bootcd.html

How do I create a bootable NetBSD/amd64 CD with mkisofs? It seems there is 
already a small bootable ISO but it doesn't include the stuff I need on our 
installation CDs.

How can I create my own _bootable_ CD, i.e. what is the boot image to use with 
mkisofs?


backup:/autobuild/netbsd-4/rel/amd64/amd64/installation> ls -lh cdrom/ floppy/
cdrom/:
total 6.5M
-rw-r--r--  1 root  wheel   44B Sep 30 06:36 BSDSUM
-rw-r--r--  1 root  wheel   60B Sep 30 06:36 CKSUM
-rw-r--r--  1 root  wheel  104B Sep 30 06:36 MD5
-rw-r--r--  1 root  wheel  302B Sep 30 06:36 SHA512
-rw-r--r--  1 root  wheel   42B Sep 30 06:36 SYSVSUM
-r--r--r--  1 root  wheel  3.2M Sep 30 06:36 boot-com.iso
-r--r--r--  1 root  wheel  3.2M Sep 30 06:36 boot.iso

floppy/:
total 5.8M
-rw-r--r--  1 root  wheel  128B Sep 30 06:36 BSDSUM
-rw-r--r--  1 root  wheel  176B Sep 30 06:36 CKSUM
-rw-r--r--  1 root  wheel  312B Sep 30 06:36 MD5
-rw-r--r--  1 root  wheel  906B Sep 30 06:36 SHA512
-rw-r--r--  1 root  wheel  130B Sep 30 06:36 SYSVSUM
-r--r--r--  1 root  wheel  1.4M Sep 30 06:36 boot-com1.fs
-r--r--r--  1 root  wheel  1.4M Sep 30 06:36 boot-com2.fs
-r--r--r--  1 root  wheel  104K Sep 30 06:36 boot-com3.fs
-r--r--r--  1 root  wheel  1.4M Sep 30 06:36 boot1.fs
-r--r--r--  1 root  wheel  1.4M Sep 30 06:36 boot2.fs
-r--r--r--  1 root  wheel  104K Sep 30 06:36 boot3.fs