drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

linux-2.6.35在fs2410开发板启动后,通过nfs挂载文件系统,但是rtc不能用,也会在挂载文件系统之前打印如下提示信息:

TCP cubic registered

NET: Registered protocol family 1

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

drivers/rtc/hctosys.c: unable to open rtc device (rtc0)


IP-Config: Complete:

device=eth0, addr=192.168.20.253, mask=255.255.255.0, gw=192.168.20.1,
     host=thomas_fs2410, domain=, nis-domain=(none),
     bootserver=192.168.20.192, rootserver=192.168.20.192, rootpath=
Looking up port of RPC 100003/2 on 192.168.20.192
Looking up port of RPC 100005/1 on 192.168.20.192
VFS: Mounted root (nfs filesystem).
Mounted devfs on /dev
Freeing init memory: 184K

解决方案:

1.   内核配置选项


 --- Real Time Clock                                                                                        
                    [*]   Set system time from RTC on startup and resume                                                   
                     (rtc0)  RTC used to set the system time                                                        
                    [ ]   RTC debug support                                                                                   
                      *** RTC interfaces ***                                                                             
                    [*]   /sys/class/rtc/rtcN (sysfs)                                                                  
                    [*]   /dev/rtcN (character devices)                                                                
                    [ ]     RTC UIE emulation on dev interface      
      *** on-CPU RTC drivers ***                                                               
                    <*>   Samsung S3C series SoC RTC  

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