Unsuccessfull try to report a bug with fix against yaboot (orphaned) via mail
Hi,
a try to report a bug against the package yaboot,
which is orphaned, shows no success.
Any suggestions? Thank you for any hints.
The answer of mailer-daemon is following.
Bye
Peter Voigt
-------------------------------------------------------------
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Datum: 6. Juni 2006 10:17:30 GMT+02:00
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From: Peter Voigt <peter.voigt1@gmx.net>
Subject: OpenBSD can't boot via yaboot on powerpc (no dualboot possible)
Date: Tue, 6 Jun 2006 10:16:55 +0200
To: submit@bugs.debian.org
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Package: yaboot
Version: 1.3.13-5
Severity: normal
OpenBSD can't boot via yaboot on powerpc.
This bug is common to all versions of debian (stabe,
testing, unstable).
boot-procedure in general
-------------------------
After power on the bios of a new-world powerpc looks
for a nvram-variable, in order to examine, which
programm is to boot.
The powerpc-bios is called open firmware. New world
is called the architecture of the newer powerpc's.
If debian was installed, the open firmware finds the
complete path to the debian-bootlooder and boot it.
The debian-bootloader is called "ofboot.b". Notice
the last two chars ".b".
This programm is written in forth, because open
firmware is able to interpret it.
The debian-bootloader ofboot.b has to be found in
a special partition, which is called "new-world
boot-partition".
ofboot.b shows a small menu. To choose the os, which
he wants to boot, the user has to strike a single key.
The key "b" forces ofboot to load & start the openbsd
bootloader, which is called "ofwboot". You notice the
char "w".
ofwboot is the original openbsd-bootloader, a machine
code programm.
the bug
-------
ofboot.b tranfers the complete path of the openbsd-kernel
to ofwboot. This path is defined in /etc/yaboot.conf
with the parameter "bsd=3D...". yaboot.conf is the alias
of lilo.conf on powerpc.
For example:
If your openbsd-installation resides on partition 7,
ofboot.b transfers "hd0:7,/bsd" or something more
cryptical to ofwboot. ofboot.b uses a notation,
which open firmware understands. Sometimes this
notation looks very cryptical.
Transferring this parameter to ofwboot is a bug,
because ofwboot doesn't want to know a complete path.
ofwboot has a built-in automatic, to look for the
openbsd-partition.
ofwboot searches for the last openbsd-partition on
the disk and tries to boot it. It does not matter,
how much openbsd-installations exist. It does not
matter, on which partition openbsd was installed.
ofwboot allways looks for the openbsd-partition,
which is the last on the disk.
ofwboot searches only in that partition. ofwboot
needs only a path relativ to that partition.
(And now you understand, why openbsd installs per
default to the last primary partition on i386).
In the example, ofwboot finds the openbsd-partition
7 and tries to boot the kernel with the name
"hd0:7,/bsd", which is not used, because the kernel
is named "bsd" on "/". In this example the correct
path is "/bsd", which is useable by ofwboot.
workaround for the non-root-user
------------------------------
While power on hold the four keys "win/apple", "alt",
"o" and "f" at the same time. Release the keys after
appearing of the open firmware message.
On the open firmware prompt type in
"boot hd0:5,/ofwboot /bsd", if your partition "5" on
disk 0 is your new-world boot-partition and the
openbsd-partitions has a kernel named "bsd" under "/".
You don't need to specify the path to the openbsd
partition (in the example 7), because ofwboot finds
it without further help.
quick & dirty fix
-----------------
ofboot.b is no member of the debian-package yaboot.
ofboot.b is generated on the fly via running "sbin".
sbin is the alias for lilo on powerpc.
sbin calls "/usr/lib/yaboot/ofboot". Notice the
missing ".b" at the end.
ofboot generates ofboot.b on the fly and stores it
in the new-world boot-partition.
In order to change ofboot.b you have to change
ofboot.
Fixing the bug is easy.
Cut the complete-path-specification in line 114 of
"/usr/lib/yaboot/ofboot".
old & buggy line 114:
# [ "$1" =3D "ybsd" ] && BOOT=3D"load-base release-load-area \" =
${4}${5%/=20
*}/${5##*/},/bsd\" \$boot"
new & working line 114:
# [ "$1" =3D "ybsd" ] && BOOT=3D"load-base release-load-area \" =
${4},\\\\\=20
\\\ofwboot /bsd\" \$boot"
a better solution
-----------------
Change the parameter "bsd=3D..." in yaboot.conf.
Let this parameter point to the openbsd-kernel
relativ to the openbsd-partition.
In the example let the user use "bsd-kernel=3D/bsd"
and not "bsd=3D/dev/hda..).
And cut the hardcoded name of the openbsd-kernel.
ofboot allways set the name to "bsd". But that is
no good.
If you compile a new openbsd-kernel, you usually
rename the old working kernel to "bsd.generic" or
"bsd.old". If the new kernel doesn't work, you
need a fallback, but cannot use yaboot. Yaboot
is only able to boot "bsd" and not any otherwise
named openbsd-kernel.
further information
-------------------
No further information. Specification of
kernel ... doesn't matter in this case.
Tested on mac mini.
Thank you for your passion to read this long text.
Yours
Peter Voigt
peter.voigt1=E3=80=88aht=E3=80=89gmx.net=
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