Re: grub2 on power6 box.

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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On 07/23/2010 05:39 PM, Lennart Sorensen wrote:
> On Fri, Jul 23, 2010 at 09:57:37AM -0400, Lennart Sorensen wrote:
>   
>> On Fri, Jul 23, 2010 at 07:56:27AM +0200, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>     
>>> On 07/22/2010 11:23 PM, Lennart Sorensen wrote:
>>>       
>>>> I am trying to use grub2 to boot an IBM p520 power6 box.  I know yaboot
>>>> can do the job, but it doesn't deal with software raid, ext4, LVM or
>>>> anything else useful.
>>>>
>>>> I have managed to get as far as booting to a grub prompt from disk.
>>>> Unfortunately it doesn't appear to be seeing any disks at that point.
>>>>
>>>> The way I got it this far was to create an 8MB (smallest cfdisk would
>>>> make) PReP boot partition, and then run grub-mkimage -n -o /tmp/grub -O
>>>> powerpc-ieee1275 *.mod in the ieee1275 grub directory.  I then dd'd
>>>> /tmp/grub to /dev/sda1 (the PReP boot partition).
>>>>
>>>>   
>>>>         
>>> You need to add -p "<your /boot/grub in grub notation>". Also avoid the
>>> raid and lvm-related modules you don't need. OFW exposes ghost devices
>>> so assembling raids which involves looking at all devices is slow
>>>       
>> I will try that (although I think I did).
>>
>> I can't even get it to do ls on any disk or anything.  It really seems
>> to be behaving as if it doesn't detect any disks.
>>     
> So I fixed ofpathname (it was not working because it did find /sys -name
> $device, which mathes multiple things on modern kernels).  I changed the
> find to find /sys -type d -name $device and now that works.  So now I
> can run grub-install, but of course that just creates a /boot/grub/grub
> file with the main grub and a filesystem module attached.  It doesn't
> actually boot.
>
> It set the
> boot_device=/pci@800000020000200/pci1014,02BD@1/sas/disk@20000:4,\grub
>
> /dev/sda4 is a fat16 partition mounted as /boot/grub.  Unfortunately I
> am not convinced the IBM boxes know how to read filesystems or boot
> files.  It seems it only wants to read raw from a PReP boot partition.
> So when I dd /boot/grub/grub to /dev/sda1 (an 8MB PReP boot partition)
> the system does start grub, but of course since grub was only the core
> plus the fat module, it just says:
>
> Welcome to GRUB!                                                                                                                                                                                                                                                               
>                                                                                                                                                                                                                                                                                
> error: no device is set.
> Entering rescue mode...                                                                                                                                                                                                                                                        
> grub rescue>
>
> So what do I do then to get it to know what device to use?
>
>   
Right now grub2 lists only aliased devices. You can either alias your
disk or directly use:

prefix=(/pci@800000020000200/pci1014\,02BD@1/sas/disk@20000,4)/
I have some code on ls issue but the problem is to reliably determine if 2 nodes are really the same device




-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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