PPC Support in FS-UAE - Page 5

FrodeSolheim · 07 October 2014, 20:31

Quote:

Originally Posted by amigafreak68k

You know a address

I meant more testing by *me* first

-But after that, I know where you live! (actually I don't, but I know where to post an OS X binary for you to test

)

FrodeSolheim · 08 October 2014, 22:42

@amigafreak68k - version with fix for reset problem:
http://fs-uae.net/devel/2.5.18dev5/ (don't enable slirp with this version)
http://fs-uae.net/devel/plugins/qemu...osx-x86.tar.gz

amigafreak68k · 09 October 2014, 06:26

I'll try it this evening

amigafreak68k · 09 October 2014, 17:00

The issue isn't fixed at all.

what does work:

- reboot with A + A + Ctrl

what doesn't work:

- reboot after Installation of AOS 4.1 with "Reboot NOW"-button (FS-UAE-emulation hangs and I must quit FS-UAE, no cold boot possible!)
- reboot in installed workbench with "reboot"-command -> after Update 6 I get green screen. In case of green screen I can use cold boot from FS-UAE menu!

FrodeSolheim · 09 October 2014, 17:23

Quote:

Originally Posted by amigafreak68k

The issue isn't fixed at all.

Well, at least the Ctrl + A + A issue is fixed

(that was what I was testing)

Oh well, back to the drawing board.

(Btw, you mentioned green screen after update 6, does this mean you do not get a green screen in earlier AmigaOS 4.1 versions? EDIT: nevermind, AmigaOS 4.1 Update 2 gets a green screen 100% of the time when issuing the reboot command)

amigafreak68k · 09 October 2014, 20:24

I don't know! I tested with my old installed System (Update 6) and got the green screen with "reboot" command. After that I reinstalled the system to test the reboot process after the installation itself. This is where I get the system freeze.

amigafreak68k · 09 October 2014, 20:34

BTW: time to motivate you a little bit

Frode, you did a great job. For classic Amiga emulation and especially for the PPC part itself! Last but not least a great work with your own implementation of the upcoming slirp support!!

So keep up the great work and thanks for such a great piece of software!

FrodeSolheim · 09 October 2014, 23:37

amigafreak68k Don't worry, I'm not discouraged. but nice you you to consider my motivation. And the latest reset fix was a real fix for a real crash, so that wasn't a dead end. This is just something else.

Fortunately it is easy to reproduce (it happens every time I issue the "reboot" command in AmigaOS 4.1 update 2). It is also relatively easy to see what is going on. I have some leads but will have to dig some more...

FrodeSolheim · 09 October 2014, 23:52

OK, I have discovered the cause of the green screen when issuing the "reboot" command in AmigaOS 4.1, and can therefore create a "fix" / workaround. However, I may need to consult with Toni so we can figure out the correct fix.

The problem is that immediately after issuing the reboot command, Cyberstorm maprom is disabled (CyberStorm MAPROM = 0 in the log file). This causes, the when machine resets "CPUBoard MAPROM" to be mapped at FFF00000 instead of the usual "CPUBoard MAPROM2", and the end result is that the PPC tries to execute garbage instead of PPC instructions.

The (incorrect) workaround is to just ignore the request to disable maprom (then, maprom_state will not be set to 0, "CPUBoard MAPROM2" will be mapped to FFF00000 again, and AmigaOS 4.1 restarts nicely). Of course, this is just a hack. So now the job is to found out what is really supposed to happen.

And this could just be treating the symptom. It isn't necessarily a bug that the maprom is disabled, the bug could just as well be that it isn't enabled during the reset - as it is when the system cold boots for example. I'm not sure at this point.

EDIT: it is a bit random if the system resets to a green screen, or if it freezes even before the machine resets. It depends on how fast the maprom is disabled. If it is disabled fast enough it seems the PPC CPU will execute garbage - and halt - before it manages to reset the system.

Here's some log output leading up to maprom state being disabled:

Code:

CS IO XBPUT 00f60018 81 PC=00f8014c
CS: Flash writable = 1
oldval: 0x3e regval: 0x3f v: 0x81
CyberStorm MAPROM = 0

FrodeSolheim · 11 October 2014, 10:31

Good news, I found the underlying issue. The problem was that when maprom is turned of, the chip memory bank isn't restored to it's original state. Therefore, the reboot sequence isn't complete, maprom isn't enabled during booting, and AmigaOS cannot load.

So a proper fix for the green screen is right around the corner

Regarding the occasional freeze-on-reboot issue, it turns out that this is a completely separate issue. The freeze occurs when maprom is disabled and the PPC CPU just after decides to jump to an interrupt handler / exception vector to handle for example an external interrupt. This does not work, as the exception vector routine has disappeared when maprom was disabled. Perhaps it just "accidentally" works on real Amigas due to tiny timing differences - or perhaps there's some other unknown factor which prevents the PPC CPU from executing an exception routine between maprom disable and reset - or even some other "magic" which lets the PPC CPU access the exception vectors also when maprom is disabled.

FrodeSolheim · 11 October 2014, 14:21

Current status: The underlying issue is confirmed to be the problem. I sent a proof-of-concept fix to Toni, and he has done a more thorough fix for it. I've already integrated this patch into FS-UAE

@amigafreak68k if you have time to test today I can provide an OS X build!

Regarding the freeze, this is still unresolved. Someone is doing some testing on real hardware for reference. If it turns out the issue cannot easily be resolved (i.e. it just accidentally works on real hardware because of CPU cache or something), then we can probably add a simply hack instead (like doing an immediate reset when maprom is disabled if the m68k is stopped).

For now, when the freeze occurs, a manual soft reset fixes it.

amigafreak68k · 11 October 2014, 14:31

Quote:

Originally Posted by FrodeSolheim

@amigafreak68k if you have time to test today I can provide an OS X build!

No problem, but today I'm very busy. For tomorrow it looks better

FrodeSolheim · 11 October 2014, 15:12

Quote:

Originally Posted by amigafreak68k

No problem, but today I'm very busy. For tomorrow it looks better

Sounds like a plan, there's a third PPC issue still resolved anyway

(but that's seems to hit WarpOS harder then AmigaOS 4...)

mulder77 · 11 October 2014, 19:29

Any timeline of the SLIRP support for Linux hosts?

amigafreak68k · 12 October 2014, 16:11

Quote:

Originally Posted by FrodeSolheim

Sounds like a plan, there's a third PPC issue still resolved anyway

(but that's seems to hit WarpOS harder then AmigaOS 4...)

BTW... I'm ready

FrodeSolheim · 12 October 2014, 18:05

Quote:

Originally Posted by amigafreak68k

BTW... I'm ready

Go ahead (also includes a fix for the third issue I mentioned yesterday)

-You need to update both FS-UAE and the QEMU-UAE plugin:

http://fs-uae.net/devel/2.5.18dev6/ (non-slirp-version)
http://fs-uae.net/devel/plugins/qemu...osx-x86.tar.gz

(I have only tested the fixes on Linux)

Quote:

Originally Posted by mulder77

Any timeline of the SLIRP support for Linux hosts?

A bit offtopic for this thread, but it will be included in regular dev. versions when I'm satisfied everything works as it should. Right now I've been occupied with PPC issues.

amigafreak68k · 12 October 2014, 18:38

Hi Frode,

I'd tested the latest dev build!

What's working:

- A + A + Ctrl
- Reboot after Installation(s) (sometimes, I'd tested twice. one works, the another one not)
- Reboot with "reboot" command (sometimes, I'd tested twice. one works, the another one not)

As you see, no "What's not working" section!

All not working reboots we can reset with the Cold-/Warm reboot menu entries from FS-UAE without emulation freeze at all!

Great work!

Should I look for another issue in this build??

FrodeSolheim · 12 October 2014, 22:53

Quote:

Originally Posted by amigafreak68k

As you see, no "What's not working" section!

Excellent

Quote:

Originally Posted by amigafreak68k

Should I look for another issue in this build??

No, not really. And regarding the reset freeze issue, the problem is fairly well understood. It looks like the reboot program may just "accidentally" work on real hardware, and that it should have disabled interrupts before disabling maprom. A disassembly of the reboot program may yield more information. There's several possible workaround, so it's just a matter of deciding which one is least likely to have any negative effects.

jbl007 · 17 October 2014, 16:45

I compiled fs-uae 2.5.19dev and qemu-uae from git but PPC emulation refuses to start: "WARNING: PPC: Wanted qemu-uae version 2.x (got 3.x)".
How can I fix this?

FrodeSolheim · 17 October 2014, 16:46

Quote:

Originally Posted by jbl007

I compiled fs-uae 2.5.19dev and qemu-uae from git but PPC emulation refuses to start: "WARNING: PPC: Wanted qemu-uae version 2.x (got 3.x)".
How can I fix this?

Doublecheck that you are infact running 2.5.19dev!

09 October 2014, 23:52	#89
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	OK, I have discovered the cause of the green screen when issuing the "reboot" command in AmigaOS 4.1, and can therefore create a "fix" / workaround. However, I may need to consult with Toni so we can figure out the correct fix. The problem is that immediately after issuing the reboot command, Cyberstorm maprom is disabled (CyberStorm MAPROM = 0 in the log file). This causes, the when machine resets "CPUBoard MAPROM" to be mapped at FFF00000 instead of the usual "CPUBoard MAPROM2", and the end result is that the PPC tries to execute garbage instead of PPC instructions. The (incorrect) workaround is to just ignore the request to disable maprom (then, maprom_state will not be set to 0, "CPUBoard MAPROM2" will be mapped to FFF00000 again, and AmigaOS 4.1 restarts nicely). Of course, this is just a hack. So now the job is to found out what is really supposed to happen. And this could just be treating the symptom. It isn't necessarily a bug that the maprom is disabled, the bug could just as well be that it isn't enabled during the reset - as it is when the system cold boots for example. I'm not sure at this point. EDIT: it is a bit random if the system resets to a green screen, or if it freezes even before the machine resets. It depends on how fast the maprom is disabled. If it is disabled fast enough it seems the PPC CPU will execute garbage - and halt - before it manages to reset the system. Here's some log output leading up to maprom state being disabled: Code: CS IO XBPUT 00f60018 81 PC=00f8014c CS: Flash writable = 1 oldval: 0x3e regval: 0x3f v: 0x81 CyberStorm MAPROM = 0 Last edited by FrodeSolheim; 10 October 2014 at 00:28.

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08 October 2014, 22:42	#82
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	@amigafreak68k - version with fix for reset problem: http://fs-uae.net/devel/2.5.18dev5/ (don't enable slirp with this version) http://fs-uae.net/devel/plugins/qemu...osx-x86.tar.gz

09 October 2014, 06:26	#83
amigafreak68k Registered User Join Date: Apr 2013 Location: Engelsdorf / Germany Posts: 468	I'll try it this evening

09 October 2014, 17:00	#84
amigafreak68k Registered User Join Date: Apr 2013 Location: Engelsdorf / Germany Posts: 468	The issue isn't fixed at all. what does work: - reboot with A + A + Ctrl what doesn't work: - reboot after Installation of AOS 4.1 with "Reboot NOW"-button (FS-UAE-emulation hangs and I must quit FS-UAE, no cold boot possible!) - reboot in installed workbench with "reboot"-command -> after Update 6 I get green screen. In case of green screen I can use cold boot from FS-UAE menu!

09 October 2014, 20:24	#86
amigafreak68k Registered User Join Date: Apr 2013 Location: Engelsdorf / Germany Posts: 468	I don't know! I tested with my old installed System (Update 6) and got the green screen with "reboot" command. After that I reinstalled the system to test the reboot process after the installation itself. This is where I get the system freeze.

09 October 2014, 20:34	#87
amigafreak68k Registered User Join Date: Apr 2013 Location: Engelsdorf / Germany Posts: 468	BTW: time to motivate you a little bit Frode, you did a great job. For classic Amiga emulation and especially for the PPC part itself! Last but not least a great work with your own implementation of the upcoming slirp support!! So keep up the great work and thanks for such a great piece of software!

09 October 2014, 23:37	#88
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	amigafreak68k Don't worry, I'm not discouraged. but nice you you to consider my motivation. And the latest reset fix was a real fix for a real crash, so that wasn't a dead end. This is just something else. Fortunately it is easy to reproduce (it happens every time I issue the "reboot" command in AmigaOS 4.1 update 2). It is also relatively easy to see what is going on. I have some leads but will have to dig some more...

11 October 2014, 10:31	#90
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	Good news, I found the underlying issue. The problem was that when maprom is turned of, the chip memory bank isn't restored to it's original state. Therefore, the reboot sequence isn't complete, maprom isn't enabled during booting, and AmigaOS cannot load. So a proper fix for the green screen is right around the corner Regarding the occasional freeze-on-reboot issue, it turns out that this is a completely separate issue. The freeze occurs when maprom is disabled and the PPC CPU just after decides to jump to an interrupt handler / exception vector to handle for example an external interrupt. This does not work, as the exception vector routine has disappeared when maprom was disabled. Perhaps it just "accidentally" works on real Amigas due to tiny timing differences - or perhaps there's some other unknown factor which prevents the PPC CPU from executing an exception routine between maprom disable and reset - or even some other "magic" which lets the PPC CPU access the exception vectors also when maprom is disabled.

11 October 2014, 14:21	#91
FrodeSolheim FS-UAE Developer Join Date: Dec 2011 Location: Førde, Norway Age: 43 Posts: 4,043	Current status: The underlying issue is confirmed to be the problem. I sent a proof-of-concept fix to Toni, and he has done a more thorough fix for it. I've already integrated this patch into FS-UAE @amigafreak68k if you have time to test today I can provide an OS X build! Regarding the freeze, this is still unresolved. Someone is doing some testing on real hardware for reference. If it turns out the issue cannot easily be resolved (i.e. it just accidentally works on real hardware because of CPU cache or something), then we can probably add a simply hack instead (like doing an immediate reset when maprom is disabled if the m68k is stopped). For now, when the freeze occurs, a manual soft reset fixes it.

11 October 2014, 19:29	#94
mulder77 Registered User Join Date: Aug 2014 Location: Germany Posts: 58	Any timeline of the SLIRP support for Linux hosts?

12 October 2014, 18:38	#97
amigafreak68k Registered User Join Date: Apr 2013 Location: Engelsdorf / Germany Posts: 468	Hi Frode, I'd tested the latest dev build! What's working: - A + A + Ctrl - Reboot after Installation(s) (sometimes, I'd tested twice. one works, the another one not) - Reboot with "reboot" command (sometimes, I'd tested twice. one works, the another one not) As you see, no "What's not working" section! All not working reboots we can reset with the Cold-/Warm reboot menu entries from FS-UAE without emulation freeze at all! Great work! Should I look for another issue in this build??

17 October 2014, 16:45	#99
jbl007 Registered User Join Date: Mar 2013 Location: Leipzig/Germany Posts: 466	I compiled fs-uae 2.5.19dev and qemu-uae from git but PPC emulation refuses to start: "WARNING: PPC: Wanted qemu-uae version 2.x (got 3.x)". How can I fix this?

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