preparing yaboot/ofpath for linux 2.6

[Roland Riegel <roland.riegel.maillist@gmx.de>]

Hi all!

When upgrading my ibook to kernel 2.6 I noticed that yaboot (that means, 
ofpath) does a very bad job in guessing the OF path of the hard disk, 
resulting in a hang on next boot.

After having a discussion with Ethan Benson, I checked the current OF 
integration in sysfs of linux-2.6.1-rc1-ben1. For some devices, sysfs 
contains a file named devspec which describes the OF path. Funnily enough, on 
my iBook G4 such a devspec file only exists for the cd/dvd drive, not for the 
hard disk:
$ find /sys -name devspec
[...]
/sys/devices/pci0001:01/0001:01:17.0/0.80000000:mac-io/0.00020000:ata-3/devspec
[...]
I do not know why this is the case, probably because they are connected to 
different ide interfaces (ata-3/ata-6)?

Ethan agreed that it seems as if OF support is not properly integrated into 
sysfs yet. However, for ofpath it is needed that for every ide device (or at 
least hard disk) an OF path can be queried. Is it correct that there is no 
other way to retrieve this information than to use devspec?

Finally Ethan suggested to bring this issue on-list. So, does anybody have a 
solution for this problem?

Greetings,
Roland