I also guss it is a device issue,but AMI works well.

> Date: Thu, 27 Aug 2015 11:16:29 -0400
> From: kevin@koconnor.net
> To: fishbaoz@hotmail.com
> CC: seabios@seabios.org
> Subject: Re: [SeaBIOS] Unremovable USB3 device can not be detected after reboot
>
> On Thu, Aug 27, 2015 at 03:47:02AM +0000, Zheng Bao wrote:
> > Fist time: Power up, SeaGate USB hard drive can be detected.
> > ------------------------------------------------------   start
> > SeaBIOS (version rel-1.8.0-0-g4c59f5d-dirty-20150826_232532-supersrv)
> [...]
> > -----------------------------------------------------------------------------  end
> >
> > Second time: Press reset button. The SeaGate USB3 hard drive can not be detected.
> > --------------------------------------------------------------------------------- start
> > SeaBIOS (version rel-1.8.0-0-g4c59f5d-dirty-20150826_232532-supersrv)
> [...]
> > |aff4a000| xhci_alloc_pipe: usbdev 0xaff4f520, ring 0xaff9e100, slotid 0, epid 1
> > |aff4a000| xhci_cmd_enable_slot:
> > |aff4a000| xhci_trb_queue: ring 0xaff9ed00 [nidx 1, len 0]
> > |aff4a000| xhci_process_events: status change port #5
> > |aff4a000| xhci_process_events: status change port #1
> > |aff4a000| xhci_process_events: status change port #5
> > |aff4a000| xhci_process_events: ring 0xaff9ed00 [trb 0xaff9ed00, evt 0xaff9ee00, type 33, eidx 1, cc 1]
> > |aff4a000| xhci_alloc_pipe: enable slot: got slotid 1
> > |aff4a000| xhci_cmd_address_device: slotid 1
> > |aff4a000| xhci_trb_queue: ring 0xaff9ed00 [nidx 2, len 0]
> > |aff4a000| xhci_process_events: ring 0xaff9ed00 [trb 0xaff9ed10, evt 0xaff9ee00, type 33, eidx 2, cc 4]
> > |aff4a000| xhci_alloc_pipe: address device: failed (cc 4)
> > \aff4a000/ End thread
>
> A cc=4 is a "USB Transaction Error". So, it looks like the device is
> being quirky.
>
> Is it possible you could try different types of USB3 drives in this
> machine?
>
> Ideally, SeaBIOS would have generic USB retry logic to try and handle
> weird errors like this. It's a bit of work to implement that though.
>
> -Kevin