Hello Tobias... I was hoping that you would jump in here. I would be
thrilled to have whatever info you could offer on the powerbook. I
didn't mean any offence by my posts, I just wanted to figure out what
changes had been made.... you are right: what is in the kernel is
correct. i just wanted to cross-check the kernel code against my
actual machine and then provide some useful information with the
specific pointers that were not in the code in case anyone else wants
to jump in and check them out. I checked out all the addresses in
nbpmac_node.h in the kernel and In the original code that you did not
fix up, there seem to be a few pointers to nothing for sound and
floppy left over from 7 years ago, followed by /* XXX Where is it?
*/ with no reference in the interrupt_info section. Those are what I
am trying to help with. You all know a lot more about this than i
do, but I have some time to kill, so I did a bunch of research.
I am just trying help anyone passing through here wit as much
information as I can to see if i hit on anything new that might be
useful. My primary concerns are getting sound to work and maybe
getting the floppy to work and maybe help with the power-off issue...
I have not looked into the SCSI at all. I re-traced all the I/O in
Macsbug, TMON and Macnosy based on known addresses from 68k-style
machines working on a similar ROM, and then guessed the rest and
dissassembled the low memory addresses to make sure... and indeed
confirmed that what is in the kernel now is correct... I am just
looking for a way to get the other features working.
You are absolutely right that there is only one VIA, and the other is
emulated in the same manner as the RBV virtual VIA2 on other
machines. i know that Apple had problems with that... so I am sure
that is part of the issue. I also know that on some of those old
machines, the 68k emulator was used to switch the status register
through the OS since the powerpc itself could send commands in
supervisor mode... it had to clue-in the 68k emulator to do it, and
then execute some instructions to translate from the 7 interrupt
levels of 68k to the single register of the powerpc... but that is
all old Apple stuff that you all already know and is easily available
in Apple's hardware developer notes, as well as all the low mwmory
pointers to hardware addresses from the ROM and very detailed notes
about interrupt handling on the x100 series.
I am also trying to figure out how the kernel polls the ADB/PMU timer
since the countdown is what seemed to keep the machine from shutting
off in MacOS... I have not found it yet, so maybe I am looking for
the wrong thing.
I have run MkLinux... from the first developer release through the
newest revision. I have it installed on a machine right now
actually. You are right... it is buggy, but my floppy and sound
"work" and it did not randomly shut the machine down except when it
crashed... which happened a lot... so I was hoping to pull some code
from them and the m68k people to see if it helps. I even have the
MkLinux book if anyone needs any information from that. The later
kernels seem to fix the powerbook ide timeout problem, but you can't
get them online anymore. I think I am running the last generic
kernel-9 version something or other. My first install I tried an old
kernel through the CD drive and had to deal with hitting a cmnd-pwr
NMI every few seconds, so I know what you are talking about there...
BIG pain in the butt!
Anyway, I won't step on anyone's toes since I am no Linux guru, but
if you need it, I am good with old mac hardware, and I have support
on my old machines for Apple's old MPW developer kits, lots of
debuggers and can compile and debug old mac programs, and I am
running machines with about 6 different versions of MacOS classic as
well as OSX. I am happy to help with whatever is needed.-------------------------------------------------------------------------
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