[UrJTAG-dev] more than one Altera Usb Blaster; how to specify which one?

[Adam M. <me...@cs...>]

Hello, all.

Most of the libftdi-based drivers let me do things like:

  jtag> cable gnICE+ DESC=XYZ

where XYZ is some string of characters found in the SerialNumber field 
of /proc/bus/usb/devices.  This way I can have multiple JTAG cables 
attached to the same host machine and be specific about which one I 
would like to use.

Sadly, the Altera USB Blaster always lists its serial number as 
00000000 (I have several of them).  Is there any way to specify which 
cable to control?  I suppose the only way to do it would be by USB 
device address -- that's ugly, but I don't mind.  How do I do this?

At first I thought the "interface=2" option would let me select the 
third USB Blaster (0, 1, 2) but apparently "interface" refers to which 
interface on a single USB device that has multiple JTAG outputs.

Thanks,

  - a