#265 `usb_blaster` driver has no way to select USB device, if multiple programmers are connected.

[Pawel Kraszewski]

OpenOCD has no way to select a particular USB-Blaster device, if more than one is connected to a host system. Especially, adapter usb location contents is not consulted by driver.

I've created a patch for today's tip v0.10.0-1241-gdadf46f6, that adds usb_blaster_port STRING config option, that accepts string compatible with ftdi_usb_open_string() function.

This allows selection of suitable programmer via d:bus/device pair and via i:vid:pid:index triple.

Hope this helps.