I2C real time clock (RTC) again.

Michael, here is everything I could mine from the old thread. There's not much I can do about the length; it is what it is.

Hi all,

I am having trouble getting uClinux to recognize the DS1338 RTC on my hardware.

The device is functioning and I can read and set the time with the i2c utils and it is keeping time, so I think the hardware I/F is ok.

I have the following options checked in the kernel config:

--- Real Time Clock

[*] Set system time from RTC at startup and resume

[rtc0] RTC used to set the system time

[*] /sys/class/rtc/rtcN (sysfs)

[*] /proc/driver/rtc (procfs for rtc0)

[*] /dev/rtcN (character devices)

<*> Dallas/Maxim DS1307/37/38/39/40, ST M41T00

When the system boots I get the following error message:

.

Linux version 2.6.27-rc4 ...

.

.

/home/chris/nios2-linux/linux-2.6/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

.

.

/> ls -al /dev/rtc*

crw-r----- 1 0 0 10, 135 Nov 29 16:00 /dev/rtc

/>

Thanks and

Good Huntin&#39;

cb

hi cb,

I&#39;ve been following this thread as I am having trouble with the RTC also. I have managed to reproduce all of your data using a different RTC chip and with the same result I&#39;m sorry to say. At the moment this issue has become a priority so I will be continuing to look at it. Please post anything you find and I will do the same.. Alex

Hi cb and halfdome,

Please check if you added i2c board info in arch/nios2/kernel/config.c, like that of arch/blackfin/mach-bf527/boards/ezkit.c.

i2c_register_board_info() and I2C_BOARD_INFO("ds1307", 0x68)

Cheer,

Hippo