This utility reads/writes service tag from/to CMOS image on DELL machines.

Useful when cloning machines including CMOS settings - to preserve service tags (which would be cloned too otherwise).

Linux, GCC, Make

$ make

Can be used directly on /dev/nvram or on an image created e.g. by:

# dd if=/dev/nvram of=cmos.bin

If you don't have /dev/nvram, try:

# modprobe nvram

# dell_service_tag /dev/nvram
A123456
# dell_service_tag /dev/nvram B234567
# dell_service_tag /dev/nvram
B234567

# cat cmos.bin >/dev/nvram
# dell_service_tag /dev/nvram `dmidecode -s system-serial-number`

OptiPlex 745, OptiPlex 755, OptiPlex 760, OptiPlex 780