I have the same problem with two different USB memory devices. I am using U-boot 1.1.3 (I can not update it) on Freescale Media5200
One USB memory device is "Cruiser Micro USB Flash Drive". I do not know type of another USB device. One device does not work at all. Another works very unstable. This message may start appearing at any time. USB is virtually useless under U-boot in my case.
Both of these USB memory devices works well with any other computers and devices. Moreover any of them work well even with Media5200 when other system is running. So I suspect that it is more probable that U-boot USB driver has poor quality and probably violates USB specification. Isn't?
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