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Re: [Qemu-ppc] How to make USB work with Mac OS X
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From: |
Alexander Graf |
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Subject: |
Re: [Qemu-ppc] How to make USB work with Mac OS X |
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Date: |
Fri, 18 Sep 2015 20:33:05 +0200 |
> Am 18.09.2015 um 15:55 schrieb Programmingkid <address@hidden>:
>
>
>> On Sep 18, 2015, at 2:14 AM, Alexander Graf wrote:
>>
>>
>>
>>> Am 17.09.2015 um 14:42 schrieb Programmingkid <address@hidden>:
>>>
>>> Is there a way to make USB work with Mac OS X on qemu-system-ppc? I used
>>> the -usb option, but mounting a flash drive didn't work. Would you know
>>> anything that could help?
>>
>> Nothing of the top of my head. It did work on x86, so maybe the ohci
>> emulation is broken? OS9 doesn't boot because of USB breakage in ohci...
>
> Just looked at Cormac's GSOC page. He said Mac OS 9 is attempting to write to
> the OHCI's HcDoneHead register. Is there anything stopping us from changing
> the HcDoneHead register so that it can be written to?
Iirc the problem is deeper...
>
> My other idea is that the operating system thinks the root hub is made by
> Apple. If we changed the device descriptor so that the software thinks it is
> made by someone else, then the operating system might use the register
> correctly. I'm thinking that Apple made their own root hub that can do things
> a standard OHCI USB controller can't do. What are your thoughts?
I doubt that this is the reason.
Alex