I've found the problem: the USB flash drive I used was USB-3!
Everything works as expected with USB-2 devices.

On Saturday, July 1, 2017 at 2:42:30 PM UTC-6, RobertCNelson wrote:
>
> Exactly, 'it' knows... USB should be enabled and powered up by default for 
> us.. like I said.. u-boot bug...
>
> On Jul 1, 2017 1:24 PM, "Sergey Manucharian" <s...@ara-ler.com 
> <javascript:>> wrote:
>
> Most likely you're right assuming that u-boot must be aware of what 
> particular CPU it's dealing with (otherwise it's not possible since there 
> is no standard API for such things as USB power).
>
>
> On Saturday, July 1, 2017 at 9:19:42 AM UTC-6, RobertCNelson wrote:
>>
>> Then that's a u-boot bug, usb should be on after USB start.
>>
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