rtc实时时钟

config RTC_DRV_TEST

tristate "Test driver/device"

help

If you say yes here you get support for the

RTC test driver. It's a software RTC which can be

used to test the RTC subsystem APIs. It gets

the time from the system clock.

You want this driver only if you are doing development

on the RTC subsystem. Please read the source code

for further details.

This driver can also be built as a module. If so, the module

will be called rtc-test.

这个选项模拟了一个rtc，使用的是系统内部驱动！！