CONFIG_WATCHDOG_CP1XXX is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

CP1XXX Hardware Watchdog support

modulename: cpwd.ko

configname: CONFIG_WATCHDOG_CP1XXX

Linux Kernel Configuration
└─>Device Drivers
└─>Watchdog Timer Support
└─>PCI support
└─>CP1XXX Hardware Watchdog support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This is the driver for the hardware watchdog timers present on
Sun Microsystems CompactPCI models CP1400 and CP1500.

To compile this driver as a module, choose M here: the
module will be called cpwatchdog.

If you do not have a CompactPCI model CP1400 or CP1500, or
another UltraSPARC-IIi-cEngine boardset with hardware watchdog,
you should say N to this option.

source code: