Here is my output
-------------------------I  have added at NX: the changes from your paste 
-------------------------http://pastebin.ca/839887
#   cu -l /dev/ttyACM0
Connected.
In:    usbtty
Out:   usbtty
Err:   usbtty
GTA01Bv4 # DEVICE_CONFIGURED: 1
Enabling automatic fast charge
printenv
baudrate=115200
bootargs_base=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 logl
evel=8

NX:
bootargs_base=rootfstype=jffs2 root=/dev/mtdblock4 console=tty0 dynticks=enable
                                                   ----------------------------

bootcmd=setenv bootargs ${bootargs_base} ${mtdparts}; nand read.e 0x32000000 kernel; bootm 
0x32000000
bootdelay=1
menu_1=Set console to USB: setenv stdin usbtty; setenv stdout usbtty; setenv stderr usbtty
menu_2=Set console to serial: setenv stdin serial; setenv stdout serial; setenv stderr seri
al
menu_3=Power off: neo1973 power-off

menu_4=Boot from SD: setenv bootargs root=/dev/mmcblk0p1 rootdelay=5 console=ttySAC0,115200
 console=tty0 loglevel=8 ${mtdparts} ro; mmcinit; ext2load mmc 0 0x32000000 /boot/${sd_imag
e_name}; bootm 0x32000000

NX:
menu_4=Boot from SD: setenv bootargs root=/dev/mmcblk0p1 rootdelay=5 console=tty0 dynticks=
enable ${mtdparts} ro; mmcinit; ext2load mmc 0 0x32000000 /boot/${sd_image_name}; bootm 0x3
2000000
------------------------------------------------------------------- diff here
-------last part same in both

NX:
mtddevname=u-boot
mtddevnum=0
----------------------both these missing from Clare's

mtdids=nand0=neo1973-nand
mtdparts=mtdparts=neo1973-nand:0x00040000(u-boot),0x00004000(u-boot_env),0x00200000(kernel)
,0x000a0000(splash),0x03d1c000(rootfs)

NX:
partition=nand0,0
pcf50606_int1=0x4a
--------------------both these missing from Clare's
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
--------------------and here are those missing lines the last one has a different value.
partition=nand0,0
mtddevnum=0
mtddevname=u-boot
pcf50606_int1=0x5a

Environment size: 1051/16380 bytes
GTA01Bv4 # cu: Got hangup signal