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131.

Partitioning Newer PowerMacs

132.

If you are installing onto a NewWorld PowerMac you must create a special bootstrap partition to hold the boot loader. The size of this partition must have at least 819200 bytes and its partition type must be <emphasis>Apple_Bootstrap</emphasis>. If the bootstrap partition is not created with the <emphasis>Apple_Bootstrap</emphasis> type your machine cannot be made bootable from the hard disk. This partition can easily be created by creating a new partition in <command>partman</command> and telling it to use it as a <quote>NewWorld boot partition</quote>, or in <command>mac-fdisk</command> using the <userinput>b</userinput> command.

133.

The special partition type Apple_Bootstrap is required to prevent MacOS from mounting and damaging the bootstrap partition, as there are special modifications made to it in order for OpenFirmware to boot it automatically.

134.

Note that the bootstrap partition is only meant to hold 3 very small files: the <command>yaboot</command> binary, its configuration <filename>yaboot.conf</filename>, and a first stage OpenFirmware loader <command>ofboot.b</command>. It need not and must not be mounted on your file system nor have kernels or anything else copied to it. The <command>ybin</command> and <command>mkofboot</command> utilities are used to manipulate this partition.

135.

In order for OpenFirmware to automatically boot &debian; the bootstrap partition should appear before other boot partitions on the disk, especially MacOS boot partitions. The bootstrap partition should be the first one you create. However, if you add a bootstrap partition later, you can use <command>mac-fdisk</command>'s <userinput>r</userinput> command to reorder the partition map so the bootstrap partition comes right after the map (which is always partition 1). It's the logical map order, not the physical address order, that counts.

136.

Apple disks normally have several small driver partitions. If you intend to dual boot your machine with MacOSX, you should retain these partitions and a small HFS partition (800k is the minimum size). That is because MacOSX, on every boot, offers to initialize any disks which do not have active MacOS partitions and driver partitions.

137.

Make sure you create a <quote>Sun disk label</quote> on your boot disk. This is the only kind of partition scheme that the OpenBoot PROM understands, and so it's the only scheme from which you can boot. The <keycap>s</keycap> key is used in <command>fdisk</command> to create Sun disk labels.

138.

Furthermore, on &arch-title; disks, make sure your first partition on your boot disk starts at cylinder 0. While this is required, it also means that the first partition will contain the partition table and the boot block, which are the first two sectors of the disk. You must <emphasis>not</emphasis> put swap on the first partition of the boot drive, since swap partitions do not preserve the first few sectors of the partition. You can put Ext2 or UFS partitions there; these will leave the partition table and the boot block alone.

139.

It is also advised that the third partition should be of type <quote>Whole disk</quote> (type 5), and contain the entire disk (from the first cylinder to the last). This is simply a convention of Sun disk labels, and helps the <command>SILO</command> boot loader keep its bearings.