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Date: Sun, 14 Sep 2003 17:13:54 +1200
From: Andrew Thompson <andy@fud.org.nz>
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To: Nate Lawson <nate@root.org>
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cc: John-Mark Gurney <gurney_j@efn.org>
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Subject: Re: USB da(4) quirks deprecated
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Nate Lawson wrote:
> On Sat, 13 Sep 2003, John-Mark Gurney wrote:
> 
>>Andrew Thompson wrote this message on Sat, Sep 13, 2003 at 16:33 +1200:
>>
>>>I have just got around to trying this pen-drive again and have been
>>>trying tracking down data corruptions.  If I mount the drive, write a
>>>file, umount/mount again the file is different.
>>>
>>Is this on an ohci controller?
>>

Yes, on a Compaq N1000v laptop (nothing but trouble)

usb0: OHCI version 1.0, legacy support
usb0: <NEC uPD 9210 USB controller> on ohci0
usb0: USB revision 1.0


>>
>>This is wierd in that it's the second page of the second transfer.
>>The ohci can do up to 8k transfers in one TD, and then chain the TD's
>>together if a larger block sized is used.
> 
> Maybe you can provide him a patch that limits transfers to a single page
> as multi-page descriptors might be broken on his controller.
> 

I have now tried the unit on my desktop at home and it works perfect, no 
corruptions. It seems to be related to my laptop usb controller as Nate 
suggests.



Andy