I'm facing an USB issue, wich does not appear systematically, but leads to no USB devices enumeration.
My plateform is based on P1010, using UTMI and on-chip PHY. I'm using EHCI controller.
P1010 is used in host mode, and is connected to a microchip USB2534 Hub.
My issue is a that the microchip hub is not enumerated at each boot of VxWorks 220.127.116.11.
My problem seems to come from missing SOF. They can be interpreted as a reset by the microchip hub, requested by the host controller. This reset leads to a false enumeration.
Following 3 files, with signal capture, and USB traces.
In good_start.jpg, we see the missing SOF. But is not reconised as reset by the hub. In this case, Hub is enumerated.
In traces.jpg, we see a SOF error packet #70
Could you please help me to solve this issue ? Do you know a workaround in order to have a good enumeration of USB devices at each boot ?
Thanks in advance for your reply,