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Old 29 June 2016, 21:17   #1
headkase
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List of valid PPC processors in WinUAE

In a PPC configuration for a setup there is a variable called ppc_model. Which defaults to automatic. Is there a list of the QEMU models you can override that with? And does it actually make any difference?
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Old 29 June 2016, 21:35   #2
Romanujan
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See the QEMU plugin source, file target-ppc/cpu-models.c

If I remember correctly, long time ago choosing some non-default value was a workaround for some bug. Some time ago I have tried several ones with OS 4.1 FE, but I didn't observe any benefits. With some settings, the OS didn't boot.
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Old 29 June 2016, 21:49   #3
Toni Wilen
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It basically selects supported CPU features. There is (far) too many PPC feature levels and more..
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Old 29 June 2016, 22:21   #4
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Is the QEMU processor speed selection tied to a specific model? Because on BPPC I get a reported speed of just under 100Mhz and with CSPPC I get a reported speed of just under 300Mhz. These speed reports come from the Ranger utility which is part of AmigaOS 4.1 Extras (on the installation CD).
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Old 30 June 2016, 00:54   #5
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This MHz counter is probably just some measurement over a simple loop calibrated against known real hardware.

Its utterly meaningless on emulation.
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Old 30 June 2016, 02:47   #6
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In my BPPC, setting ppc_model to this:

ppc_model=604e_v2.4

AMAZINGLY speeds everything up. Night and day. I will have to use it some more to establish a stability evaluation but making that exact one change has made a huge difference.

Edit: And Ranger still reports 98Mhz so I'll ignore that going forward.

Last edited by headkase; 30 June 2016 at 03:12.
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Old 30 June 2016, 06:37   #7
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Ok, I've been using the BPPC emulation with the specified processor since I made my last post. Works perfect. Just as good or better than the CSPPC setup.

And I made a quick video of it for someone else:

[ Show youtube player ]
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