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

Starfire RTC

modulename: rtc-starfire.ko

configname: CONFIG_RTC_DRV_STARFIRE

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Starfire RTC
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
If you say Y here you will get support for the RTC found on
Starfire systems.

source code:
drivers/rtc/rtc-starfire.c