Indeed, the device appears added to the UHCI in both crashing cases and to EHCI in the working case. Also, sometimes instead of BSOD of guest OS I get abort of QEMU:
qemu-system-i386: hw/usb/core.c:735: usb_ep_get: Assertion `pid == 0x69 || pid == 0xe1' failed. /usr/bin/qemuxp: line 4: 13514 Aborted (core dumped) qemu-system-i386 /home/ruslan/iso/Windoze/qemuxp.img -m 512 -display sdl -vga vmware -enable-kvm -usb -device usb-ehci $* here $* stands for -snapshot -hdb ~/iso/ntfs-data.img and the crash was triggered by using usb_add command in QEMU terminal and then attempting to access the device from WinXP. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1440843 Title: Guest WinXP crashes when trying to use a USB spectrometer Status in QEMU: New Bug description: I'm using Amadeus spectrometer (OceanOptics USB250) via Windows-based software "Quantum". I've tried six ways of attaching it to QEMU: 1. command line parameter "-device usb-host,hostbus=3,hostaddr=25" 2. command line parameter "-device usb-host,vendorid=0x2457,productid=0x1030" 3. command line parameter "-usbdevice host:2457:1030 4. command line parameter "-usbdevice host:3.25" 5. qemu console command "usb_add host:2457:1030" 5. qemu console command "usb_add host:3.25" From these, only "-device ..." options work, i.e. numbers 1 and 2 in the list above, and all others lead to IRQL_NOT_LESS_OR_EQUAL BSOD in usbuhci.sys when I launch Quantum, which tries to start acquiring spectra. I've also tried to reproduce the crash with a flash drive, but couldn't — it seems to work reliably in this case. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1440843/+subscriptions
