ghost ~ # cu -l /dev/ttyACM0
Connected.
In:    usbtty
Out:   usbtty
Err:   usbtty
DEVICE_CONFIGURED: 1
Enabling automatic fast charge
GTA01Bv4 # printenv
baudrate=115200
bootargs_base=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 loglevel=8 regular_boot
bootcmd=setenv bootargs ${bootargs_base} ${mtdparts}; nand read.e 0x32000000 kernel; bootm 0x32000000
bootdelay=1
menu_1=Boot from microSD: setenv bootargs ${bootargs_base} rootfstype=ext2 rootfs=/dev/mmcblk0p1 rootdelay=5 ${mtdparts} ro; mmcinit; ext2load mmc 0 0x32000000 /boot/${sd_image_name}; bootm 0x32000000
menu_2=Set console to USB: setenv stdin usbtty; setenv stdout usbtty; setenv stderr usbtty
menu_3=Set console to serial: setenv stdin serial; setenv stdout serial; setenv stderr serial
menu_4=Power off: neo1973 power-off
mtdids=nand0=neo1973-nand
quiet=1
sd_image_name=uImage
splashimage=nand read.e 0x32000000 splash 0x5000; unzip 0x32000000 0x33d00000 0x96000
stderr=usbtty
stdin=usbtty
stdout=usbtty
usbtty=cdc_acm
mtdparts=mtdparts=neo1973-nand:0x00040000(u-boot),0x00004000(u-boot_env),0x00200000(kernel),0x000a0000(splash),0x03d1c000(rootfs)
partition=nand0,0
mtddevnum=0
mtddevname=u-boot
pcf50606_int1=0x4a

Environment size: 1057/16380 bytes