[U-Boot-Users] usb problem

[kow9loon]

Hi Markus,

At this point, we have not yet identified the location of the driver where
it gets hung. Just everything got frozen once the 128 MB mark  was reached.
By the way, where could I get hold of the patch from Rodolfos? I did a
serach and followed the link provided by Rodolfos, but the link when
NOWHERE. Did Rodolfos submitted his patches to be incorporated to the U-boot
trunk? If he did, where could I get hold of his patches such that I could
better understand it and try it out? Thank you in advance for your help. 

Regards,

Kow9loon


Markus Klotzbücher-2 wrote:
> 
> 
> kow9loon <easter8 at hotmail.com> writes:
> 
>> We have problems reading/writing from/to a USB NAND flash having a
>> capacity
>> of 512 MB. What we dicovered was: up to a capacity of 128 MB, the
>> operations
>> looked 'koche', thereafter, the system hanged. Our hardware setup are
>> as
> 
> Where does it hang?
> 
>> follows: (1) a MPC8544E CPU; (2) a ISP 1564 PCI-USB 2.0 Host Controller;
>> (3)
>> a ST72681 Flash Driver Controller; and (4) a 512 MB Nand flash. 
>>
>> We also understand that support of the OHCI driver in U-boot is only
>> limited
>> to support of "Mass Storage Device" class device, and rapid reading and
>> writing could post a potential problem. We deliberately slow down the
>> read/write traffic in an attempt to give some breathing rooms to the
>> the
> 
> Some so called "crappy" USB sticks are known to have some timing
> problems and require additional delays, but so far no real fix has been
> found. Search the archives for Rodolfos "crappy Usbkeys" patch. Does
> this fix solve you problem?
> 
> Regards
> 
> 	Markus
> 
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