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Diffstat (limited to 'docs/usb-storage.txt')
| -rw-r--r-- | docs/usb-storage.txt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/docs/usb-storage.txt b/docs/usb-storage.txt new file mode 100644 index 0000000000..ff9755920d --- /dev/null +++ b/docs/usb-storage.txt @@ -0,0 +1,38 @@ + +qemu usb storage emulation +-------------------------- + +Qemu has two emulations for usb storage devices. + +Number one emulates the classic bulk-only transport protocol which is +used by 99% of the usb sticks on the marked today and is called +"usb-storage". Usage (hooking up to xhci, other host controllers work +too): + + qemu ${other_vm_args} \ + -drive if=none,id=stick,file=/path/to/file.img \ + -device nec-usb-xhci,id=xhci \ + -device usb-storage,bus=xhci.0,drive=stick + + +Number two is the newer usb attached scsi transport. This one doesn't +automagically create a scsi disk, so you have to explicitly attach one +manually. Multiple logical units are supported. Here is an example +with tree logical units: + + qemu ${other_vm_args} \ + -drive if=none,id=uas-disk1,file=/path/to/file1.img \ + -drive if=none,id=uas-disk2,file=/path/to/file2.img \ + -drive if=none,id=uas-cdrom,media=cdrom,file=/path/to/image.iso \ + -device nec-usb-xhci,id=xhci \ + -device usb-uas,id=uas,bus=xhci.0 \ + -device scsi-hd,bus=uas.0,scsi-id=0,lun=0,drive=uas-disk1 \ + -device scsi-hd,bus=uas.0,scsi-id=0,lun=1,drive=uas-disk2 \ + -device scsi-cd,bus=uas.0,scsi-id=0,lun=5,drive=uas-cdrom + + +enjoy, + Gerd + +-- +Gerd Hoffmann <kraxel@redhat.com> |