boot: kernel
Please wait, loading kernel...
   ELF32 kernel loaded...
(everything is fine... but)

DEFAULT CATCH!, code=300 at %SRR0: 0141146c %SSR1: 00003030
(the system goes back to open firmware...)

Then, I have no other option than rebooting the machine and loading the
generic linux-2.2.17 from the debian's ppc port.

What's wrong..?

---
Pierre Snchal
(p...@pierresenechal.qc.ca)

In article <j_Iy7.6967$uJ3.858...@news20.bellglobal.com>,
        "Pierre Snchal" <p...@pierresenechal.qc.ca> writes:

I've seen this from a few different people in a few different
places.  I'm guessing it's some sort of change in the Open
Firmware, since I've used other CHRP-BOOT scripts which load
okay (but don't do what I want).

There's another script at
http://sdb.suse.de/sdb/en/html/olh_ppc_macosx.html
which has the following excerpt:

dup 20 dump
3 + c@ 10 = if
" Booting MacOS X ..." cr " boot ultra0:11,\\:tbxi" eval
then
" get-key-map" " keyboard" open-dev $call-method
dup 20 dump
2 + c@ 80 = if
" Booting MacOS 9 ..." cr " boot ultra0:9,\\:tbxi" eval
then
" get-key-map" " keyboard" open-dev $call-method
dup 20 dump
1 + c@ 01 = if
" Booting Linux ..." cr " boot ultra0:10,\\yaboot" eval
then
" get-key-map" " keyboard" open-dev $call-method
dup 20 dump
5 + c@ 08 = if
" Booting MacOS ..." cr " boot ultra0:9,\\:tbxi" eval
else
" Booting Linux ..." cr " boot ultra0:10,\\yaboot" eval
then

As closely as I can tell, the lines like "3 + c@ 10" are
comparing the keyboard input to a certain character, and
acting if the input matches (the = if...).  The only problem
I'm having is, how do I read something like "3 + c@ 10"?
I can't for the life of me find any resources that document
what this means.  It'd be really nice, because then I could
change the meaning of the characters and add my own boot
options.

Any ideas?

- --keith

- --
kkel...@speakeasy.net
alt.os.linux.slackware FAQ:
http://wombat.san-francisco.ca.us/perl/fom

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Keith, OpenFirmware is a FORTH, so any FORTH text (if you can find one)
will tell you what's going on. What you gave as an example is fairly
simple, once you get your head around the stack-based nature of FORTH,
along with the reverse-Polish way of writing things.
e.g. dup 20 dump
means duplicate the number on the top of the stack, dump the 20 bytes
from there

3 + c@ 10 = if
" Booting MacOS X ..." cr " boot ultra0:11,\\:tbxi" eval
then

means add 3 to the number on the top of the stack fetch the byte at that
address, compare it to 10, if true do the stuff until the word 'then'
(which looks like emitting a string, folowed by a RETURN (cr) followed
by executing (eval) the boot command.

I suspect basic FORTH knowledge is required for any rational work on OF
scripts. Try comp.lang.forth or comp.forth.lang.mac.

HTH,

Michael
(take out the dots if you want my real address)

In article <3BCC5D81.600E0...@bbsrcdot.acdot.uk>,
        michaeldotba...@bbsrcdot.acdot.uk writes:

I actually had some of this figured out before posting, then got
some more of it figured out last night after posting, but the big
issue still is, what does the comparison actuall compare?  Why add
3 to the top of the stack?  Why compare to 10?

Way ahead of you--I subscribed just before reading my news this
morning.  :)

Thanks for the help,

- --keith

- --
kkel...@speakeasy.net
alt.os.linux.slackware FAQ:
http://wombat.san-francisco.ca.us/perl/fom

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