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Debian on Power 740: yaboot can't open device

Hello everybody!

I'm in the process of installing Debian Stable on a Power 740 system.
I'm familiar with the installation on x86 systems and the installation
process of Debian ppc thus looked familiar.

I installed using the "install64" option. Disk partition was "guided -
use whole disk, with separate /home". Installation concluded
successfully but after a reboot yaboot loads and offers the choice of
"Linux" and "old" - as per standard configuration I learned - but
booting "Linux" fails:

Config file read, 4096 bytes                                                    
Welcome to yaboot version 1.3.13                                                
Enter "help" to get some basic usage information                                
  Linux                      old                                                
Please wait, loading kernel...                                                  
Can't open device </vdevice/v-scsi@30000002/@1:0>                               
/vdevice/v-scsi@30000002/@1:2,/boot/vmlinux: Unable to open file, Invalid device

The device however is valid - I can see it in the SMS menu - and I can
successfully boot into the rescue system via the Debian cd ("rescue64")
and subsequently chroot into my installed system, no problem.
However, I can never boot straight into it with yaboot.

Some information about the system:

root@debian:/# cat /proc/partitions 
major minor  #blocks  name          
   8        0    6291456 sda        
   8        1       7168 sda1       
   8        2    1902592 sda2       
   8        3          1 sda3       
   8        5     262144 sda5       
   8        6    4115456 sda6       

root@debian:/# cat /etc/yaboot.conf             
## yaboot.conf generated by debian-installer    
## run: "man yaboot.conf" for details. Do not make changes until you have!!     
## see also: /usr/share/doc/yaboot/examples for example configurations.         
## For a dual-boot menu, add one or more of:                                    
## bsd=/dev/hdaX, macos=/dev/hdaY, macosx=/dev/hdaZ                             

root@debian:/# mount                                                            
/dev/sda2 on / type ext3 (rw,relatime,errors=remount-ro,data=ordered)           
/dev/sda6 on /home type ext3 (rw,relatime,errors=continue,data=ordered)         
tmpfs on /dev type tmpfs (rw,relatime,mode=755)                                 
proc on /proc type proc (rw,relatime)                                           
sysfs on /sys type sysfs (rw,relatime)                                          
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)                                                                          

root@debian:/# ls -lR /boot/                                                    
total 18364                                                                     
-rw-r--r-- 1 root root  1214811 Jun 14 14:44 System.map-2.6.32-5-powerpc-smp    
-rw-r--r-- 1 root root    93218 Jun 14 14:44 config-2.6.32-5-powerpc-smp        
lrwxrwxrwx 1 root root       31 Sep  7 09:44 initrd.img -> initrd.img-2.6.32-5-powerpc-smp                                                                      
-rw-r--r-- 1 root root 10216212 Sep  7 09:44 initrd.img-2.6.32-5-powerpc-smp    
lrwxrwxrwx 1 root root       28 Sep  7 09:44 vmlinux -> vmlinux-2.6.32-5-powerpc-smp                                                                            
-rw-r--r-- 1 root root  7233739 Jun 14 14:44 vmlinux-2.6.32-5-powerpc-smp       

root@debian:/# uname -a                                                         
Linux debian 2.6.32-5-powerpc64 #1 SMP Tue Jun 14 11:04:52 UTC 2011 ppc64 GNU/Linux                                                                             

I'm at a loss as to what the problem might be. The installation looks
fine within the chroot environment, I just can't get it to boot.

I also tried an install as per the wiki site
(https://www.ibm.com/developerworks/mydeveloperworks/wikis/home?lang=en#/wiki/Debian%206%20on%20Power7%20LPAR/page/Start%20installation) with updating yaboot during the install as described but without lick. The only aspect where my install differs is with regard to the use of multipath. I use a plain old scsi disk and only have one VIOS in the machine.

Any suggestions would be much appreciated.

Benedikt Wegmann
+49 (0)551 201-1870

Gesellschaft für wissenschaftliche Datenverarbeitung mbH Göttingen
Am Fassberg 11, 37077 Göttingen
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