You can define devices and their order in device.map but it is not necessary. yast2-bootloader checks the devices during the installation and proposes a device.map by itself. It can happen that the order of the devices is wrong or you have defined a different order than it is in the BIOS (please take care about changes there. it can leads to unbootable system).

<device_map config:type="list">
     <device_map_entry>
       <firmware>hd0</firmware> <!-- order of devices in target map  -->
       <linux>/dev/disk/by-id/ata-ST3500418AS_6VM23FX0</linux> <!-- name of device (disk)  -->
     </device_map_entry>
</device_map>

This is an important part where you can define where to install GRUB and also how the boot process will work. It is not necessary to define this part as mentioned before, yast2-bootloader proposes a configuration by itself and so this is optional. Usually the AutoYaST profile includes only this part and all other parts are added automatically during installation by yast2-bootloader. Unless you have some special needs, you don't have to specify the bootloader config in the XML file.

 <global>
     <activate>true</activate>
     <default>openSUSE 11.2 - 2.6.31.5-0.1</default>
     <gfxmenu>(hd0,1)/boot/message</gfxmenu>
     <lines_cache_id>4</lines_cache_id>
     <timeout config:type="integer">10</timeout>
 </global>

<activate>true</activate>

<default>openSUSE 11.2 - 2.6.31.5-0.1</default>

<gfxmenu>(hd0,1)/boot/message</gfxmenu>

<timeout config:type="integer">10</timeout>

<generic_mbr>false</generic_mbr>

<boot_mbr>false</boot_mbr>

<boot_boot>false</boot_boot>

<boot_root>false</boot_root>

<boot_extended>false</boot_extended>

<boot_custom>/dev/sda3</boot_custom>

<trusted_grub>false</trusted_grub>

This is a list of initrd modules. It is not necessary to add this part it should be added automatically. Please don't modify it if you are not sure what the initrd modules are.

This part defines the type of the bootloader. It could be grub, lilo, ppc or elilo.

<loader_type>grub</loader_type>
    

This includes the configuration of the boot sections in the menu.lst. This part is added by yast2-bootloader during installation automatically. It is good to know that yast2-bootloader deletes boot sections with no valid kernel and initrd path. It also deletes such boot sections.

   <sections config:type="list">
     <section>
       <append>resume=/dev/disk/by-id/raid-sil_ajacccbhejai-part2 splash=silent quiet showotps</append>
       <image>(hd0,0)/vmlinuz-2.6.31-10-default</image>
       <initial>1</initial>
       <initrd>(hd0,0)/initrd-2.6.31-10-default</initrd>
       <lines_cache_id>0</lines_cache_id>
       <name>openSUSE 11.2 Milestone 8 - 2.6.31-10 (default)</name>
       <original_name>linux</original_name>
       <root>/dev/mapper/sil_ajacccbhejai_part3</root>
       <type>image</type>
       <vgamode>0x31a</vgamode>
     </section>
     <section>
       <append>resume=/dev/disk/by-id/raid-sil_ajacccbhejai-part2 splash=silent quiet showopts</append>
       <image>(hd0,0)/vmlinuz-2.6.31-10-xen</image>
       <initrd>(hd0,0)/initrd-2.6.31-10-xen</initrd>
       <lines_cache_id>2</lines_cache_id>
       <name>Xen -- openSUSE 11.2 Milestone 8 - 2.6.31-10</name>
       <nounzip>0</nounzip>
       <original_name>xen</original_name>
       <root>/dev/mapper/sil_ajacccbhejai_part3</root>
       <type>xen</type>
       <vgamode>0x31a</vgamode>
       <xen>(hd0,0)/xen.gz</xen>
       <xen_append></xen_append>
     </section>
     <section>
       <blockoffset>1</blockoffset>
       <chainloader>/dev/fd0</chainloader>
       <lines_cache_id>3</lines_cache_id>
       <name>Floppy</name>
       <noverifyroot>true</noverifyroot>
       <original_name>floppy</original_name>
       <type>other</type>
     </section>
   </sections>

the options depend on the type.

<append>splash=silent quiet showopts</append>

<image>(hd0,0)/vmlinuz-2.6.31-10</image>

<initrd>(hd0,0)/my-initrd</initrd>

<name>Productive System</name>

<original_name>linux</original_name>

<root>/dev/mapper/sil_ajacccbhejai_part3</root>

<type>xen</type>

<vgamode>0x31a</vgamode>

<xen>(hd0,0)/xen.gz</xen>

<xen_append></xen_append>

<name>Floppy</name>

<original_name>linux</original_name>

<type>other</type>

<blockoffset>1</blockoffset>

<chainloader>/dev/fd0</chainloader>

<noverifyroot>true</noverifyroot>

<remap>false</remap>

<makeactive>false</makeactive>

<name>Floppy</name>

<original_name>linux</original_name>

<type>other</type>

<configfile>1</configfile>

<root>/dev/sda1</root>