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[Qemu-discuss] Connecting to a USB serial device on Mac

From: Brett Jackson
Subject: [Qemu-discuss] Connecting to a USB serial device on Mac
Date: Fri, 9 Oct 2015 18:47:54 -0500

I'm trying to connect a custom-built controller that connects through USB to a qemu instance for a class. The device is connects through USB but is I guess emulated as a serial device. How can I connect this to my qemu VM? I have tried 
"-usbdevice serial:vendorid=0403,productid=6001:/dev/tty.usbserial-ECE391" 
and the "-serial" option, however, it always displays this output:

"qemu-system-i386: -usbdevice serial:vendorid=0403,productid=6001:/dev/tty.usbserial-ECE391: character device backend type 'serial' not supported
qemu-system-i386: -usbdevice serial:vendorid=0403,productid=6001:/dev/tty.usbserial-ECE391: Failed to create USB device 'usb-serial'
qemu: could not add USB device 'serial:vendorid=0403,productid=6001:/dev/tty.usbserial-ECE391'"

How can I get qemu to support serial?

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