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39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
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USB 2.0 Quick Start
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===================
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The QEMU EHCI Adapter does *not* support companion controllers. That
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implies there are two completely separate USB busses: One USB 1.1 bus
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driven by the UHCI controller and one USB 2.0 bus driven by the EHCI
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controller. Devices must be attached to the correct controller
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manually.
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The '-usb' switch will make qemu create the UHCI controller as part of
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the PIIX3 chipset. The USB 1.1 bus will carry the name "usb.0".
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You can use the standard -device switch to add a EHCI controller to
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your virtual machine. It is strongly recommended to specify an ID for
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the controller so the USB 2.0 bus gets a individual name, for example
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'-device usb-ehci,id=ehci". This will give you a USB 2.0 bus named
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"ehci.0".
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I strongly recomment to also use -device to attach usb devices because
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you can specify the bus they should be attached to this way. Here is
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a complete example:
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qemu -M pc ${otheroptions} \
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-drive if=none,id=usbstick,file=/path/to/image \
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-usb \
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-device usb-ehci,id=ehci \
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-device usb-tablet,bus=usb.0 \
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-device usb-storage,bus=ehci.0,drive=usbstick
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This attaches a usb tablet to the UHCI adapter and a usb mass storage
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device to the EHCI adapter.
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enjoy,
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Gerd
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--
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Gerd Hoffmann <kraxel@redhat.com>
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