PXA270에 DS1307를 사용하기 위해서 커널에서 무엇을 바꾸어 주어야 하나요 ?

다음과 같이 설정을 했는데, 안되네요... 무엇이 잘못되었나요?

# make menuconfig
Device Drivers  --->
 Real Time Clock  --->
  <*> RTC class
  [*]   Set system time from RTC on startup
  (rtc1)  The RTC to read the time from
  <*>   sysfs
  <*>   proc
  <*>   dev
  <*>   Dallas/Maxim DS1307 and similar I2C RTC chips

부팅로그 메시지.

wm9712ts registe complete irq=116
i2c /dev entries driver
i2c: error: exhausted retries
i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
i2c: ICR: 000007e0 ISR: 00000002
i2c: log: [00000446:000007e0]
I2C: i2c-0: PXA I2C adapter
i2c: error: timeout
i2c: msg_num: 1 msg_idx: 0 msg_ptr: 0
i2c: ICR: 000007e9 ISR: 00000004
i2c: log:
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c: error: exhausted retries
i2c: msg_num: 1 msg_idx: 0 msg_ptr: 0
i2c: ICR: 000007e9 ISR: 00000004
i2c: log:
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c_adapter i2c-1: i2c_pxa: timeout waiting for bus free
i2c: error: exhausted retries
i2c: msg_num: 1 msg_idx: 0 msg_ptr: 0
i2c: ICR: 000007e9 ISR: 00000004
i2c: log:
i2c_adapter i2c-1: Client creation failed at 0x68 (-5)
I2C: i2c-1: PXA I2C adapter
SD Card initial
Advanced Linux Sound Architecture Driver Version 1.0.14rc3.