I managed to make my own cape (for two XBee modules). It works very well 
(even sending between the two modules and to the third one on the 
computer), but:

if I use node ./eeprom.js

I suspect that my cape is expected to be connected to the fourth (or third 
if you start counting at 0) i2c bus:

/sys/bus/i2c/drivers/at24/3-0057/eeprom instead of 
/sys/bus/i2c/drivers/at24/1-0057/eeprom 

So should I fix that in my cape (my cape is default at 
/sys/bus/i2c/drivers/at24/1-0057 
but can be configured to go from /sys/bus/i2c/drivers/at24/1-0054 .. 
/sys/bus/i2c/drivers/at24/1-0057)

Apart from that, I managed to program the eeprom and get it working, but 
since it uses UART 2 and UART 5 I needed to change /boot/uboot/uEnv.txt to 
get that working (BBB Rev B so that is why I needed to 
change /boot/uboot/uEnv.txt instead of /media/BEAGLEBONE/uEnv.txt), but do 
I need to supply that with my final version somewhere or is it enough to 
put that in the manual?

Sincerely,
Johan

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