HI, we have a problem with several USB-Storage. Sometimes the U-Boot cannot access to our used USB Storage.
Sometimes in five of six times the USB Storage works fine. in other Cases the Same USB works in one of six times.
i did not remove the Stick from the USB Port during the Tests. i only rebooted the system by reseting the hardware.
The Terminal gives the error massage if we try to flash the Colbri-Module with our OS.
The os is a Yocto Angstrom distribution.
"epis iMX7 # run setupdate
** Unrecognized filesystem type **
USB0: USB EHCI 1.00
scanning bus 0 for devices… EHCI timed out on TD - token=0x80008c80
unable to get device descriptor (error=-1)
2 USB Device(s) found
USB1: USB EHCI 1.00
scanning bus 1 for devices… 2 USB Device(s) found
scanning usb for storage devices… 0 Storage Device(s) found
** Bad device usb 0 **
FEC0 Waiting for PHY auto negotiation to complete… TIMEOUT !
Could not initialize PHY FEC0
Using FEC0 device
TFTP from server 192.168.10.1; our IP address is 192.168.10.2
Load address: 0x80800000
ARP Retry count exceeded; starting again
epis iMX7 #
The routing of the USB is from colibri module to a USB hub SMSC2512 and from the Hub tu the USB A Ports.
I encountered Problems like this one before and very often it signal integrity issues.
can you please provide your schematic for a review. your can send them to firstname.lastname@example.org.
please include a reference to this ticket in the email.
There is a rash of USB 2 stuff out there that only works some of the time. It’s lower-end/cheaper and I encounter it on eBay quite often. Some of the USB 2 drives I bought on there were so thin you could put them in upside down. I have bought thumb drives that would work in 3 out of 4 desktop computers on the project. Not “generic” desktop computers, mind you, HP and Lenovo. Adding insult to injury, it wasn’t always the same machine that was picky.
I’ve even had the USB 2 finicky problem with name brand media.
I do not encounter this problem with USB 3. Not to say it isn’t possible, just saying I’ve never encountered it. I think they tightened up the specifications, at least for sizes. I’ve encountered a few generic USB 3 devices that will not successfully fall back to USB 2 but I’ve never had the finicky port problem.
the USB-Stick, who does not work very well on our custom carrier board, works all fine at an PC (HP Probook).
it seams to be that the fault is only in U-Boot mode at High speed funktionality. In kernel mode or on the OS the Stick works. But it seamst the speed is only Full Speed.
with file attachments it gets filtered out sometimes.
So like link we sent you to upload is the better way.
And this way we received your upload file which you uploaded to our server and will check it.
The USB works fine in User Space with 12 Mbit/s.
this problem is only in u-Boot with 480MBit/s
i have also desoldered the inductions in the ground line of the USB-Devices. Now the current back path have low induction. the USB signal get a sharper edge but the problem is still available.