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Question, USB Compliance Test of i.MX6Q

Question asked by AVNET JAPAN FAE (team share account) on Sep 29, 2016
Latest reply on Oct 4, 2016 by CarlosCasillas

Dear team,


I would like to ask about the USB compliance test of i.MX6Q.

My customer is trying to measure eye-pattern of USB signals of i.MX6Q and they have a following question.

Referring to the following community thread, they are trying to measure eye-pattern of USB signal using with your i.MX6Q-SABRE board.

But after they executed the memtool command, Linux stopped and the signal did not flow out.

Their test environment is as below;

OS: LinuxBSP

Kernel: 3.14.28


HW: Please see the attached file


After they executed following commands, Linux hung.

# memtool 0x2184184 1                           //read the register settings, address of the other USB port is 0x2184384

# memtool 0x2184184=0x18441205      // Force to output Test Packet for Eye Diagram Test   

# memtool 0x2184184=0x18411205      //Force to output J_STATE

# memtool 0x2184184=0x18421205      // Force to output K_STATE

# memtool 0x2184184=0x18431205      // Force to output SE0 (host) / NAK (device)


# memtool 0x2184384=0x18001305      // Force to output Reset

# memtool 0x2184384=0x18001285      //Ho Force to output Suspend

# memtool 0x2184384=0x18001245      // Force to output Resume

# memtool 0x2184184=0x18441205


Do you have any ideas on the cause of this phenomenon?