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Re: [Qemu-ppc] Debug logs for USB on MorphOS

From: BALATON Zoltan
Subject: Re: [Qemu-ppc] Debug logs for USB on MorphOS
Date: Fri, 11 Nov 2016 01:11:24 +0100 (CET)
User-agent: Alpine 2.20 (BSF 67 2015-01-07)

On Thu, 10 Nov 2016, G 3 wrote:
I want to help, but I have an iMac G5. Every attempt I have made to boot the iso file has failed. I even tried this:
boot cd:,\mac_ppc64\boot.img debug ramdebug ed=pci

Wish I could help.

Thanks for the quick reply but you were not the first :-)
I've already got logs from the PowerMac G4 AGP so that is enough for now.

No need to send any more logs. Thanks for everyone who tried to help.

For those interested in more details it seems that the pciusb.device driver finds the OHCI chip in QEMU but does not like it and does not claim or try to initialise it for some reason. While the USB stack and most of this driver is open source this seems to happen in the MorphOS specific parts that are not open sourced, documented and do not report any errors just fail silently (like most other MorphOS drivers) in case something is not right, so this makes it a bit difficult to debug it without source. I don't expect to get it working very soon with limited time for this but may eventually get a bit further on it.

The usefulness of this activity may not be direct as MorphOS may not ever run fully on QEMU (and even when it did it would probably be only good for trying the demo in a limited way before investing in a supported hardware to run it on) but the bugs found and fixed during this do help making the device models in QEMU more accurate and help running other OSes. I think some of the bugs fixed this way in OpenBIOS and QEMU also helped to get MacOS running so I like to believe there are at least some indirect usefulness of this.


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