http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml?part=1&chap=4#doc_chap4 Creating the BIOS Boot Partition We first create a very small BIOS boot partition. Type n to create a new partition, then p to select a primary partition, followed by 1 to select the first primary partition. When prompted for the first sector, make sure it starts from 2048 (which is needed for the boot loader) and hit enter. When prompted for the last sector, type +32M to create a partition 32 Mbyte in size: This incorrectly tells to user to create a 32 Mbyte BIOS boot partition. It should be a 2 Mbyte partition since that is the size that is used throughout the guide.
Indeed, my bad. Should be fixed now in CVS and will show up on the site in an hour or so. Thanks for reporting!