Re: Pegasos2 hangs during usb_discover()

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Hello,

On Dec 15, 2010, at 5:25 PM, Frank Wille wrote:

> Some more information on this problem. Maybe somebody has an idea:
>
> The Pegasos enters an infinite loop in usb_allocmem() due to a  
> corrupted
> usb_frag_freelist entry, which was just allocated in the previous  
> call.
>
> Probably caused by a USB DMA transfer, the block, offs and next  
> fields of
> the head usb_frag_dma node are trashed. This is an uhci controller.
>
> Is it possible to do USB transfers without DMA for testing? I see  
> not many
> possibilities to debug it further.
>
> USB worked some months ago. No other PPC port seems to be affected.  
> Are
> other ofppc (non-Pegasos) machines affected? Any information is  
> welcome.

This may be because all PowerMacs with onboard USB use OHCIs. Most USB  
cards sold these days seem to be OHCIs as well, in fact I have only  
one UHCI card which did have some trouble with sparc64.
So, any chance to see if you have the same problem with an ohci card?

have fun
Michael

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