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=/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. > 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=(/p...@800000020000200/pci1014\,0...@1/sas/d...@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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