RS/6000 yaboot Notes
---------------------

A. System Partitioning:
   1. Only FDISK partitioning has been tested on the RS/6000.
      However, yaboot does support mac partitions on a mac, so they should
      work on an RS/6000 if you really want to go that route.
   2. Extended FDISK partitions have not been tested and are not expected to
      work at this time.
   3. yaboot must be installed by itself in a bootable partition of type 0x41.
      This partition must be less than 10MB.

   Recommended partition configuration:
      /dev/sda1 : PREP Boot.    Type 0x41. Size = 4 MB
      /dev/sda2 : Linux swap.   Type 0x82. Size = 128 MB
      /dev/sda3 : Linux native. Type 0x83.

B. Building & Installation:
   1. See the partitioning section for notes & examples on how to configure
      your system partitions when installing Linux.
   2. Build yaboot by doing:
       make clean; make
   3. Install yaboot by doing (as root):
      dd if=yaboot of=/dev/sdax
      where x is the boot partition; for example: dd if=yaboot of=/dev/sda1
   4. Make a yaboot.conf file in /etc/yaboot.conf

C. Configuration File (/etc/yaboot.conf):
   1. See the ybin documentation for the full range of options.
   2. Options tested on an RS/6000 include:
      timeout = <time in tenths of a second>
      default = <default label>
      root= <device containing the root filesystem>
      image = <path to vmlinux kernel file>
      label = <short name for this image>

   3. Examples:

      ## example /etc/yaboot.conf for RS/6000
      ## Timeout value is in tenths of a second
      timeout=200
      default=linux

      image=/boot/vmlinux
      label=linux
      root=/dev/sda3

      image=/boot/vmlinux.new
      label=new
      root=/dev/sda3


D. Tested Configurations:
   1. RS/6000 Model 150 (PPC 604e; CHRP IBM,7043-150)

      fdisk -l /dev/sda

      Disk /dev/sda: 64 heads, 32 sectors, 8678 cylinders
      Units = cylinders of 2048 * 512 bytes

         Device Boot    Start       End    Blocks   Id  System
      /dev/sda1   *         1         9      9200   41  PPC PReP Boot
      /dev/sda2            10      2010   2049024   83  Linux
      /dev/sda3          2011      2139    132096   82  Linux swap

   2. RS/6000 Model 260 (PPC 630; CHRP IBM,7043-260)

      * Set "CONFIG_PPC64BRIDGE = y" in the Makefile!

   3. RS/6000 Model F50 (PPC 630; CHRP IBM,7025-F50)


E. Other Documentation:
   1. The ybin distribution includes addition README files and
      man pages.

F. Questions & comments can be directed to:
   engebret@us.ibm.com or
   bergner@us.ibm.com