On Fri, 13 Jan 2023, Howard Spoelstra wrote:
On Fri, Jan 13, 2023 at 12:53 AM BALATON Zoltan <bala...@eik.bme.hu> wrote:
The names also show what we intend to
emulate even though the emulation may not be complete or have bugs (this
is also true for other machines in QEMU where a lot of them are not fully
emulated, only well enough to boot guest OSes).
Looks like everybody has forgotten the previous discussion and not read
the docs and deprecation patches where this is explained so I summarise
the proposed change here again:
No, I haven't forgotten that discussion. FWIW (as I cannot contribute): I
personally do not oppose a name change, the new names seem more
descriptive. I tested your patches and they behave as they should. The
functionality does not change. However, my simple point was what's in a
name when the underlying machine does not reflect what the name implies.
In case of powermac3_1 (currently mac99,via=pmu) it does resemble the
PowerMac3,1 G4 AGP machine. It's also what the device tree says and the
emulated hardware corresponds to that machine, apart from some missing
pieces (like I2C) and known bugs in some (like USB) it aims to emulate
that machine but it's currently hidden in the obscure via option of mac99
which ny default is some non-existent Mac like machine with cuda. It's
much easier for users not having inside knowledge of QEMU to get a machine
type which clearly says what it emulates. If we ever want to run firmware
ROM from the real machine we also want to make sure we emulate a real
machine. I've done some steps in that direction before and submitted RFC
patches that could get to an OF prompt with some debugger tweaking and
could eventually made to work but it needs Mark's screamer series to get
finished and some rewrite of the macio emulation to add I2C cleanly so
it's stalled currently but maybe one day we'll get there.
For powermac7,3 it is what qemu-system-ppc64 -M mac99 currently aims to
emulate evidenced by the comment at the beginning and that it adds U3
chipset instead of Uninorth but currently only Linux boots on this
machine. It may need some more fixes to get other OSes running starting
with the device tree. I think the way for that is to move device tree
creation to QEMU similar to what other PPC machines do. I have plans for
that but it's blocked by not being able to contribute to OpenBIOS as most
of my patches are disliked by Mark but I'll keep trying.
The powerboot3,2 is one hardware I could find info on having PMU and ADB
and it's the same era as the PowerMac3,1 so has similar hardware but not
sure why this combination is even there. What guest needs this that cannot
run with either mac99 or powermac3,1?
It is not my place to comment on a possible development agenda. I can only
tell you what I'd like and point out issues.
- qemu-system-ppc -M mac99 is unchanged and works like before it just
warns for the via option and when using it in qemu-system-ppc64 suggesting
using new machines instead so these could evetually be removed next year.
mac99,via=cuda is just mac99 so you can continue to use that, mac99 is
not deprecated and don't want to remove it.
- qemu-system-ppc64 -M mac99 -> powermac7_3
- qemu-system-ppc -M mac99,via=pmu -> powermac3,1
- qemu-system-ppc64 -M mac99,via=pmu-adb -> powerbook3_2
The last one is one of the rare Macs that had adb and pmu, all others with
pmu usually have USB. The PowerMac1,2 (G4 PCI) had CUDA but not with mac99
hardware but more similar to g3beige and no ADB ports according to
https://en.wikipedia.org/wiki/Power_Mac_G4#1st_generation:_Graphite
https://en.wikipedia.org/wiki/Power_Macintosh_G3_(Blue_and_White)#Hardware
The PowerMac7,3 seems to be matching the PCI device listing in the comment
at the beginning of mac_newworld.c and also this article:
https://www.informit.com/articles/article.aspx?p=606582
What is the 2 USB devices problem? Is it the one we've debugged before and
found that it's noted in a comment marked with ??? in hw/usb/hcd-ohci.c?
That could be fixed if there was somebody interested enough to provide a
patch.
It is not about passing through USB devices and active packets per
endpoint. The powermac3,1 has two 2 USB 1.1 ports. However, when booting
Mac OS 9.0.4 with via=pmu it will support only one (the kbd). When started
with via=cuda -usb -device usb-kbd -device usb-mouse it will support the
first-mentioned usb-kbd. When kbd and mouse arguments are reversed it
supports the other device ;-)
Is this something that happens on real hardware as well or is it some bug
in emulation somewhere? If the drivers on this OS keep active packets on
different endpoints then it's the same issue we've discovered with USB
pass through of audio devices that also need this feature. If it's
something else it may be fixable but we need to understand first what
causes the issue.
Regards,
BALATON Zoltan
