http://ubuntuforums.org/showthread.php?t=1107066
They indicate that, for whatever reason, the Mac OpenFirmware sometimes loses track of exactly which device the CD really lives on. My TiBook seems to suffer from this fault; here's the "devalias" output:
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hd /pci@f2000000/mac-io@17/ata-4@1f000/disk@0
cd /pci@f2000000/mac-io@17/ata-3@20000/disk@0
zip /pci@f2000000/mac-io@17/ata-3@20000/disk@1
ide0 /pci@f2000000/mac-io@17/ata-3@20000/disk@0
ide1 /pci@f2000000/mac-io@17/ata-3@20000/disk@1
ultra0 /pci@f2000000/mac-io@17/ata-4@1f000/disk@0
ultra1 /pci@f2000000/mac-io@17/ata-4@1f000/disk@1
Note that "cd" points at "disk@0", while "ide1" (and "zip") point at disk@1. Sure enough, there's an issue:
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0 > dir cd:\ can't OPEN the DIR device
ok
0 > dir ide1:\
Fedora 11 ppc DVD
Size/ GMT File/Dir
bytes date time TYPE CRTR Name
36 6/ 2/ 9 18:22:39 ???? ???? .discinfo
1917 6/ 2/ 9 18:22:49 ???? ???? .treeinfo
1/ 1/ 4 0: 0: 0 etc
18363 7/ 3/ 7 18: 6:50 ???? ???? GPL
1/ 1/ 4 0: 0: 0 images
95 6/ 2/ 9 18:27: 7 ???? ???? media.repo
1/ 1/ 4 0: 0: 0 Packages
1/ 1/ 4 0: 0: 0 ppc
10581 5/14/ 9 0:59:28 TEXT ttxt README-BURNING-ISOS-en_US.txt
1/ 1/ 4 0: 0: 0 repodata
1653 5/11/ 9 18:45:33 ???? ???? RPM-GPG-KEY-fedora-11-primary
1694 5/11/ 9 18:45:33 ???? ???? RPM-GPG-KEY-fedora-ia64
ok
(Yes, I know this is the Fedora 11 PPC DVD and not YDL 6.x, but I think that this might have something to do with the core problem seen on YDL as well.)
I'm going to try to boot off the "ide1" alias, to see if I get any further. I guess that the other option is to try to make a permanent change to the "cd" drive alias, as this machine certainly doesn't have a zip drive installed in it...
Hope this helps,
t.