mspdebug with bus pirate: this driver does not support raw USB access

[BreakfastSerial]

I have a bus pirate:

HiZ>i                                                                                                                                                      
Bus Pirate v3b                                                                                                                                             
Firmware v5.10 (r559)  Bootloader v4.4                                                                                                                     
DEVID:0x0447 REVID:0x3046 (24FJ64GA002 B8)                                                                                                                 
http://dangerousprototypes.com   

and am trying to run mspdebug with the bus-pirate driver, which runs into the following error:

mspdebug bus-pirate
MSPDebug version 0.25 - debugging tool for MSP430 MCUs
Copyright (C) 2009-2017 Daniel Beer <dlbeer@gmail.com>
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Chip info database from MSP430.dll v3.3.1.4 Copyright (C) 2013 TI, Inc.

bp: this driver does not support raw USB access

Is this an issue with the bus pirate driver for mspdebug, or related to the bus pirate firmware?

EDIT: I've subsequently tried to specify the device -d /dev/ttyUSB0, but I believe the final problem, which I can't resolve is: bp: this driver does not support Spy-Bi-Wire. My target does not offer SBW, only 4-wire JTAG, which from what I understand does not work in this setup.