【linux内核的rtc时钟配置】linux内核的rtc时钟配置，见Device Drivers--->Real Time Clock 。我们的RTC主要是有三种接口配置，一种是I2C接口，一种是SPI接口，还有就是CPU自带RTC时钟芯片。推荐配置如下：
I2C接口RTC时钟支持芯片
Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025
Dallas/Maxim DS1374
Dallas/Maxim DS1672
Dallas/Maxim DS3232
Maxim MAX6900
Ricoh R2025S/D, RS5C372A/B, RV5C386, RV5C387A
Intersil ISL1208
Intersil ISL12022
Xicor/Intersil X1205
Philips PCF8563/Epson RTC8564
Philips PCF8583
ST M41T62/65/M41T80/81/82/83/84/85/87
TI BQ32000
Seiko Instruments S-35390A
Ramtron FM3130
Epson RX-8581
Epson RX-8025SA/NB
EM Microelectronic EM3027
Micro Crystal RTC
SPI接口RTC时钟支持芯片
PC-style 'CMOS'
Dallas DS1286
Dallas DS1511
Maxim/Dallas DS1553
Maxim/Dallas DS1742/1743
Simtek STK17TA8
ST M48T86/Dallas DS12887
ST M48T35
ST M48T59/M48T08/M48T02
Oki MSM6242
TI BQ4802
Ricoh RP5C01
EM Microelectronic V3020
CPU自带RTC时钟芯片
ARM AMBA PL030 RTC
ARM AMBA PL031 RTC
NS2816 RTC
