Detecting the device :
$ ./papilio-prog -v -c
Could not access USB device 0403:6010.
If you receive this error message, then the user isn’t part of the plugdev
group.
$ ./papilio-prog -v -c
Using built-in device list
JTAG chainpos: 0 Device IDCODE = 0x11c1a093 Desc: XC3S250EISC_Done = 0
ISC_Enabled = 0
House Cleaning = 1
DONE = 0
USB transactions: Write 4 read 3 retries 6