On Fri, 2010-07-23 at 11:39 -0400, 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=/p...@800000020000200/pci1014,0...@1/sas/d...@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. OF can read FAT12 filesystem. you could format it with fat 12 and then mount it at /boot/grub. then you can use grub-install and grub-mkconfig to create a grub.cfg I think the easiest way is to set a devalias in OF to point to you device: devalias hd /p...@800000020000200/pci1014,0...@1/sas/d...@20000 then it should appear when you use the 'ls' command. you could also set boot-device to hd:<parnumber>,grub since OF can read FAT12 filesystem it will be able to find grub there.
> 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? > -- Best Regards, Manoel Rebelo Abranches Software engineer IBM - Linux Technology Center - Brazil _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
