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Re: [PATCH v2 4/5] Patch the CHRP boot script


On Sat, Nov 18, 2017 at 2:01 PM, Frank Scheiner <frank.scheiner@web.de> wrote:
> Hi Mathieu,
> On 11/18/2017 01:17 PM, Mathieu Malaterre wrote:
>> Hi Frank,
>> On Sat, Nov 18, 2017 at 11:52 AM, Frank Scheiner <frank.scheiner@web.de>
>> wrote:
>>> This patch requires the ofpath tool which is part of the yaboot package,
>>> as both ofpathname (part of powerpc-ibm-utils package) and
>>> grub-ofpathname (not available packaged but part of the GRUB source
>>> code) do not translate a given device node into a working OF path on
>>> type 11,2 and 7,3 G5 Power Macs.
>> Sorry if this sound silly, but are you sure you want to use a tool
>> from the yaboot package, while the original intent is to get rid of
>> the yaboot package ?
> I originally didn't knew that the ofpath tool was part of the yaboot
> package. It was available in-target when starting the GRUB installation in
> expert mode (i.e. despite skipping the yaboot installation) hence I assumed
> it might be part of some DEB package installed by default on ppc64 and in
> addition it also was the only device-node-to-OF-path-translation-tool that
> worked "correctly" for the tested G5 Power Macs, so I just used it.
> E.g. for /dev/sda ofpathname returned
> "/ht@0,f2000000/pci@9/k2-sata-root@c/scsi@0/sd@0,0" while devalias in OF
> says it's "/ht/pci@9/k2-sata-root/k2-sata@0/disk@0".
> And for /dev/sda2:
> * I unfortunately don't have a result for ofpathname currently
> * grub-ofpathname returned "/ht@0,f2000000/pci@9/k2-sata-root@c/disk@0:b"
> which didn't work
> * ofpath returned "/ht@0,f2000000/pci@9/k2-sata-root@c/@0/@0:2" which worked
> It's of course not ideal, and we should maybe try to fix either ofpathname
> or grub-ofpathname or include ofpath (which btw is just a shell script) in
> another package (e.g. grub-installer already has an additional tool for PReP
> boot devices or integration in powerpc-ibm-utils (for ppc64/newworld alone)
> or powerpc-utils (for both powerpc/ and ppc64/newworld).
> Up until now yaboot was the "only" boot loader for powerpc and ppc64, so it
> made some sense to include ofpath there (also because it came from the same
> developer). With an additional boot loader, it would IMHO make more sense to
> include ofpath in another DEB package to be able to share it's
> functionality.

Well that's surprising. Thanks for the detailed explanation. I've
filled #882076 and forwarded upstream. I fail to understand how people
would install grub on ppc64 if grub-ofpathname does not return the
correct path.


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