VirtualBox

Changes between Initial Version and Version 1 of Ticket #20442, comment 4


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Timestamp:
Jul 5, 2021 7:25:06 AM (3 years ago)
Author:
lerdmann

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  • Ticket #20442, comment 4

    initial v1  
    1 From what I can tell, the port status and control registers show sensible values if I attach a device (device speed, connection state etc.). For a USB2 protocol port, the enable bit (PED) will never switch to 1.
     1From what I can tell, the port status and control registers show sensible values if I attach a device (device speed, connection state, port power state, port link state etc.). For a USB2 protocol port, the enable bit (PED) will never switch to 1.
    22I guess that's a HC driver problem (for some reason it does not initiate the necessary USB2 sequence to enable a port).
    33For USB3 protocol port, the PED bit will switch to 1 but that is done in HW (according to XHCI spec), without involvement of the HC driver.

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