[U-Boot-Users] usb problem

Markus Klotzbücher mk at denx.de
Thu Apr 19 10:49:41 CEST 2007

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?



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