http://d-i.alioth.debian.org/manual/en.i386/ch05.html has this link: 5.1.7. i386 Boot Parameters which leads to the top of http://d-i.alioth.debian.org/manual/en.i386/ch05s01.html#id2513778The info I expected to see is at http://d-i.alioth.debian.org/manual/en.i386/ch05s02.html
5.2. Boot Parameters