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xhci: add usage info to docs

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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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Gerd Hoffmann 2012-05-29 11:20:31 +02:00 committed by Anthony Liguori
parent 1643f2b232
commit e78bd5ab07
1 changed files with 15 additions and 0 deletions
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docs/usb2.txt
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@ -55,6 +55,21 @@ try ...
... then use "bus=ehci.0" to assign your usb devices to that bus.
xhci controller support
-----------------------
There also is xhci host controller support available. It got alot
less testing than ehci and there are a bunch of known limitations, so
ehci may work better for you. On the other hand the xhci hardware
design is much more virtualization-friendly, thus xhci emulation uses
less ressources (especially cpu). If you wanna give xhci a try
use this to add the host controller ...
qemu -device nec-usb-xhci,id=xhci
... then use "bus=xhci.0" when assigning usb devices.
More USB tips & tricks
======================