Sharkoon QuickPort XT USB3.0 at full speed only
Franz Schwartau
franz at electromail.org
Sun Oct 23 08:31:59 UTC 2011
Hi again,
meanwhile I did some debugging.
QuickPort dump_device_desc:
http://pastebin.com/h62jLHui
QuickPort dump_curr_config_desc:
http://pastebin.com/6rheBiMi
Debug messages (hw.usb.debug=4):
http://paste2.org/p/1733421
I found an external HDD enclosure (Sharkoon Rapid-Case 3.5" SATA USB3.0)
which uses the same SATA bridge chip (ASM1051, Vendor 0x174C, Product
0x55AA). Attached to an USB port it uses high speed instead of full
speed of the QuickPort.
Rapid-Case dump_device_desc:
http://pastebin.com/B7suMZG7
Rapid-Case dump_curr_config_desc:
http://pastebin.com/D6xPyYUp
The only difference I could find is wMaxPacketSize in Endpoint 0 and
Endpoint 1 is set to 0x40 for the QuickPort. The Rapid-Case external
enclosure has set wMaxPacketSize to 0x200.
Having a look at lsusb's output under Linux wMaxPacketSize is set to
0x200 even for the QuickPort:
http://pastebin.com/fMcxhKax
If more debug information is needed don't hesitate to ask. :-)
Best regards
Franz
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