[SeaBIOS] [PATCH 2/2] usb-xhci: use hub portmap

[Gerd Hoffmann]

On Tue, 2017-07-18 at 13:51 +0200, Paul Menzel wrote:
> Dear Gerd,
> 
> 
> On 07/18/17 13:36, Gerd Hoffmann wrote:
> > xhci controllers have two virtual ports per (usb3 capable) physical
> > port, one for usb2 and one for usb3 devices.  Add a hub portmap
> > callback
> > to map the virtual ports to physical ports.  For now assume we
> > simply
> > have the same number of usb2 and usb3 ports.
> 
> How can the change be tested? Do you have some QEMU command?

The qemu xhci controller has the virtual usb3 ports first, then the
usb2 ports.  So this problem shows up when you try to boot from usb2
storage devices, because for the usb2 ports the virtual port numbering
differs from the physical port numbering.  Typically happens when you
pass-through usb2 sticks (via -device usb-host) and try to boot from
them.  The emulated usb-storage works fine as it has usb3 support.

cheers,
  Gerd