On 11/21/2017 03:27 AM, Benjamin Herrenschmidt wrote: > On Tue, 2017-11-21 at 09:56 +0100, Mathieu Malaterre wrote: >> Hi Ben, >> >> Sorry for the direct question, but I assumed you would know the >> answer. We are currently trying to replace yaboot with grub-ieee1275 >> in debian-installer, but are facing a very small issue, namely with OF >> path handling. It appears that on Apple hardware only `ofpath` from >> Yaboot returns the correct path. Are you using grub on any of your >> Apple hardware ? Thanks much for comments. > > +Nathan > > I have used grub on Apple systems in the past but it's quite possible > that I ended up fixing up the path by hand. To be honest I haven't > booted any of my Apple systems in a while, but I still have some I > can dig out to test if needed. > > Some more comments below... > >> See below for full context. >> >> On Tue, Nov 21, 2017 at 7:51 AM, Frank Scheiner <frank.schei...@web.de> >> wrote: >>> Hi Rick, >>> >>> On 11/21/2017 02:48 AM, Rick Thomas wrote: >>>> >>>> If you can tell me *exactly* what to do, and I don’t have to set up an >>>> installation environment to do it, I’ll be happy to test ofpathname vs >>>> ofpath vs devalias on my PowerPC test machine farm. >>> >>> >>> Well, to be on the safe side, I think you need to use the latest versions of >>> ofpath and ofpathname, hence running Debian Sid could be the easiest way to >>> make sure this is the case. >>> >>> You need to have a disk installed, because ofpath and IIC also ofpathname do >>> not or cannot translate non existing device aliases to OF paths. >>> >>> In general the commands I ran for the p5 520Q below should do. Assuming that >>> the output of ofpathname will always be wrong for Power Macs, it should be >>> sufficient to check only one partition. >>> >>> I think devalias does only save/return OF paths up to the disk level, but >>> not up to the partition level. But the disk level should already be >>> sufficient to detect differences to ofpath and/or ofpathname. >>> >>> You have to go to OF to run devalias, but with a glass console you won't be >>> able to copy the output. There are ways to interact with the OF via telnet >>> from another machine (see [1] and possibly [2]), but I haven't tried this >>> yet. >>> >>> [1]: >>> https://web.archive.org/web/20040202053614/http://developer.apple.com/technotes/tn/tn2004.html >>> >>> [2]: >>> https://web.archive.org/web/20040202060137/http://developer.apple.com:80/technotes/tn/tn2023.html >>> >>>> >>>> I have the following machines: >>>> Power Mac G5 11,2, >>>> Power Mac G5 7,2 (I think — it’s turned off right now) >>>> Mac mini G4 10,1 >>> >>> >>> I have these types available, too, "except" for the 7,3 which currently >>> won't start up correctly. >>> >>> Here's the output of ofpath and ofpathname for /dev/sda2 on the my Mac mini >>> (10,1): >>> ``` >>> root@mac-mini:~# ofpath /dev/sda2 >>> /pci@f4000000/ata-6@d/@0:2 >>> >>> root@mac-mini:~# ofpathname /dev/sda2 >>> /usr/sbin/ofpathname: line 812: warning: command substitution: ignored null >>> byte in input >>> /pci@f4000000/ata-6@d/scsi@0/sd@0,0 > > So here, ofpathname gets confused by the fact that Linux shows ATA > devices as scsi (which is a Linux'ism). ofpath has workarounds to deal > with that which should probably be ported over. > >>> >>> Also interesting, it looks like ofpathname cannot even give a "correct" >>> result for an IBM machine, at least not for my p5 520Q: >>> ``` >>> root@p5-520q:~# lsblk >>> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT >>> sda 8:0 0 136.7G 0 disk >>> ├─sda1 8:1 0 7M 0 part >>> ├─sda2 8:2 0 131.1G 0 part >>> ├─sda3 8:3 0 1K 0 part >>> └─sda5 8:5 0 5.6G 0 part >>> sr0 11:0 1 1024M 0 rom >>> >>> root@p5-520q:~# ofpath /dev/sda1 >>> /pci@800000020000003/pci@2,4/pci1069,b166@1/scsi@0/@3:1 >>> >>> root@p5-520q:~# ofpathname /dev/sda1 >>> /pci@800000020000003/pci@2,4/pci1069,b166@1/scsi@0/sd@3,0 >>> >>> root@p5-520q:~# ofpath /dev/sda2 >>> /pci@800000020000003/pci@2,4/pci1069,b166@1/scsi@0/@3:2 >>> >>> root@p5-520q:~# ofpathname /dev/sda2 >>> /pci@800000020000003/pci@2,4/pci1069,b166@1/scsi@0/sd@3,0 >>> ``` >>> >>> Please notice that ofpathname returns the same result for two different >>> partitions. :-/ > > Ouch. I think ofpathname is still maintained by some of our IBM guys > isn't it ? Might be worth digging there (or fixing it up !). > > Nathan, do you know anything about this ?
I haven't seen this before. I don't have access to a Mac to re-create what you're seeing above, if you can send me the output from running the script with 'set -x' at the top I will take a look. You could also do this for the command above that produces the waning on line 812. -Nathan > >>>> Mac G4 3,4 >>>> Mac G4 dual core 3,6 >>> >>> >>> Results for these machines would be helpful. It should work to >>> install/upgrade to Debian Sid on one machine only and just move the disk to >>> the other machine later on for testing. > > I can test if you are willing to fix the script :) > > Cheers, > Ben. > >
