a third question about device node /dev/usb_jtag

[youxiaojie]

[13660.160162] usb 3-1.2: new high-speed USB device number 5 using ehci-pci
[13660.892885] usb 3-1.2: config 1 interface 0 altsetting 0 bulk endpoint 0x1 has invalid maxpacket 64
[13660.892889] usb 3-1.2: config 1 interface 0 altsetting 0 bulk endpoint 0x81 has invalid maxpacket 64
[13660.893637] usb 3-1.2: New USB device found, idVendor=1443, idProduct=0001, bcdDevice= 0.00
[13660.893640] usb 3-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[13660.893642] usb 3-1.2: Product: USB JTAG Cable
[13660.893643] usb 3-1.2: Manufacturer: Digilent
root@debian:/media/allan/home_data/ixo-usb-jtag# ls /dev/
Display all 187 possibilities? (y or n)
autofs hugepages/ rfkill sg1 tty18 tty4 tty61 vcsa4
block/ hwrng rtc sg2 tty19 tty40 tty62 vcsa5
bsg/ initctl rtc0 sg3 tty2 tty41 tty63 vcsa6
btrfs-control input/ sda sg4 tty20 tty42 tty7 vcsu
bus/ kmsg sda1 sg5 tty21 tty43 tty8 vcsu1
cdrom kvm sda2 sg6 tty22 tty44 tty9 vcsu2
cdrw log sda3 shm/ tty23 tty45 ttyS0 vcsu3
char/ loop-control sda4 snapshot tty24 tty46 ttyS1 vcsu4
console mapper/ sda5 snd/ tty25 tty47 ttyS2 vcsu5
core mei0 sda6 sr0 tty26 tty48 ttyS3 vcsu6
cpu/ mem sda7 stderr tty27 tty49 uhid vfio/
cpu_dma_latency memory_bandwidth sda8 stdin tty28 tty5 uinput vga_arbiter
cuse mqueue/ sdb stdout tty29 tty50 urandom vhci
disk/ net/ sdb1 tty tty3 tty51 vcs vhost-net
dri/ network_latency sdb2 tty0 tty30 tty52 vcs1 vhost-vsock
drm_dp_aux0 network_throughput sdb3 tty1 tty31 tty53 vcs2 watchdog
dvd null sdb4 tty10 tty32 tty54 vcs3 watchdog0
dvdrw port sdb5 tty11 tty33 tty55 vcs4 watchdog1
fb0 ppp sdb6 tty12 tty34 tty56 vcs5 zero
fd/ psaux sdc tty13 tty35 tty57 vcs6
full ptmx sdd tty14 tty36 tty58 vcsa
fuse ptp0 sde tty15 tty37 tty59 vcsa1
hidraw0 pts/ sdf tty16 tty38 tty6 vcsa2
hpet random sg0 tty17 tty39 tty60 vcsa3
root@debian:/media/allan/home_data/ixo-usb-jtag# cat Makefile
boot: std.hex
-test -e /dev/usb_jtag && /sbin/fxload -D /dev/usb_jtag -I std.hex -t fx2

   -D devpath
          Specifies the "usbfs" path name for the device in question, such as /proc/bus/usb/004/080.  This takes precedence over any DEVICE environment  variable  that
          may be set.

I see the Makefile it should be a new device and use fxload to transfer firmware.this is my log when plug my digilent jtag-usb to computer, no new device found! no /proc/bus/usb/.....