Hi,
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 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 driver (and possibly to the controller). Unfortunately, our endeavors, thus far, have only limited success. We would appreciate any comments that could help us to dig our way out of this hole. Thank you.
Regards,
Kow9loon