Cannot enumerate/read USB mass storage if Linux booted from USB

Further developments:

Indications are that u-boot leaves USB initialized in some way that makes it unusable to Linux.

If I simply do a 'usb start' then I get the "NOT-WORKING" results in my previous post regardless from where the zImage/dtb files are loaded.

Can anybody comment on how to 'un-initialize' the USB subsystem in u-boot so that Linux can later use it?? (I tried 'usb reset', 'usb stop', and 'usb stop f' - these did not help).

Thanks,

George Broz

Moog Industrial Group