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Re: [vfio-users] USB enumeration (uPD720201)

On December 4, 2015 at 02:38:36, Brett Foster (fosterb edgeandvertex org) wrote:
Switched to a 2-port ASMedia controller and I was able to attach a hub out of the box. Yay! So the Renesas card is garbage.

Hi Brett,

Is there any possibilities that your specific card is broken? I’ve googled around before buying the card, and it seems that Renesas uPD720201 cards are better performant than ASMedia ones.

On December 4, 2015 at 04:12:00, Alex Williamson (alex l williamson gmail com) wrote:
Hmm, let me offer another data point; if I assign the onboard ASMedia USB3 controller to my VM, I often get hangs when OVMF enumerates attached devices and it's a crap shoot whether devices will work after a VM reboot.  On the other hand, my Renesas card works much more reliably.  However, I've also found that TI based USB3 chips work far more reliably than either of those for non-VM, bare metal use (no VM experience on those).  The early versions of the Renesas chips are pretty crappy, but I infer that newer ones are more well behaved.  Personally I'm not a fan of any ASMedia components and avoid them in my purchasing decisions.  Thanks,


Hi Alex,

I just noticed that Texas Instruments also makes USB 3.0 chipset. Are you referring to TUSB7340 like this [1]. The new item price listed almost as twice as Renesas’ :D 

[1] http://www.ebay.com/itm/4-port-USB-3-1-3-0-USB3-1-USB3-0-GEN-1-5G-celi-connector-PCI-Express-PCIe-Card-/252193889668?hash=item3ab7ed5d84:g:qVUAAOSwAYtWKfMb

Best regards,

Okky Hendriansyah

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