New findings:
The problem is different, it happens only with USB 3 flash drives, USB 2 devices are powered properly. I don't have real statistics, but the newest SanDisk's drives won't work.
However, it's hard to believe that a tiny USB drive requests more than 500mA to assume that the controller and/or u-boot decide to not provide power to it.
Sergey
Excerpts from Lokesh Vutla's message from Mon 10-Jul-17 18:47:
On 7/8/2017 8:50 AM, Sergey Manucharian wrote:
(sorry for top posting, sending from a phone)
I would agree it's intentional at the first stage: we don't want to power external devices which we may not need, however, the "usb start" command must enable it, otherwise it's useless...
Right. Any chance you bisected to the commit which caused the issue?
Thanks and regards, Lokesh
-S. Original Message From: Tom Rini Sent: Friday, July 7, 2017 18:41 To: sm; Lokesh Vutla Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] USB power is not enabled fro BeagleBone Black
On Sat, Jul 01, 2017 at 12:51:41PM -0700, sm wrote:
Hi all,
The latest git version does not turn on USB power on BeagleBone Black: "usb start" reports that the port is not accessible, but with external power provided it detects the plugged in device.
Yes, I think this may be intentional?