Re: [Qemu-devel] How to make USB work with Mac OS X

Re: [Qemu-devel] How to make USB work with Mac OS X

[Programmingkid]

On Sep 18, 2015, at 2:14 AM, Alexander Graf wrote:

> 
> 
>> Am 17.09.2015 um 14:42 schrieb Programmingkid <programmingkidx@gmail.com>:
>> 
>> 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? 

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?

Re: [Qemu-devel] How to make USB work with Mac OS X

[Alexander Graf]

> Am 18.09.2015 um 15:55 schrieb Programmingkid <programmingkidx@gmail.com>:
> 
> 
>> On Sep 18, 2015, at 2:14 AM, Alexander Graf wrote:
>> 
>> 
>> 
>>> Am 17.09.2015 um 14:42 schrieb Programmingkid <programmingkidx@gmail.com>:
>>> 
>>> 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

Re: [Qemu-devel] How to make USB work with Mac OS X

[Programmingkid]

On Sep 18, 2015, at 2:33 PM, Alexander Graf wrote:

> 
> 
>> Am 18.09.2015 um 15:55 schrieb Programmingkid <programmingkidx@gmail.com>:
>> 
>> 
>>> On Sep 18, 2015, at 2:14 AM, Alexander Graf wrote:
>>> 
>>> 
>>> 
>>>> Am 17.09.2015 um 14:42 schrieb Programmingkid <programmingkidx@gmail.com>:
>>>> 
>>>> 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...

I think you may be right. 

Do you have any more information on this problem?

> 
>> 
>> 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.

I did make a patch that makes the hcDoneHead register writable. I can't say I noticed a difference in Mac OS 9 or Mac OS X in QEMU with it. 

Re: [Qemu-devel] How to make USB work with Mac OS X

[Alexander Graf]

> Am 18.09.2015 um 20:38 schrieb Programmingkid <programmingkidx@gmail.com>:
> 
> 
>> On Sep 18, 2015, at 2:33 PM, Alexander Graf wrote:
>> 
>> 
>> 
>>> Am 18.09.2015 um 15:55 schrieb Programmingkid <programmingkidx@gmail.com>:
>>> 
>>> 
>>>> On Sep 18, 2015, at 2:14 AM, Alexander Graf wrote:
>>>> 
>>>> 
>>>> 
>>>>> Am 17.09.2015 um 14:42 schrieb Programmingkid <programmingkidx@gmail.com>:
>>>>> 
>>>>> 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...
> 
> I think you may be right. 
> 
> Do you have any more information on this problem?

Unfortunately not. Ben had a quick look at it a while back but also did not get it functional. You're more than welcome to give it a try as well.

Alex