Reported by Nikolaus Schaller, May 1, 2010
dmesg says: drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Comment 1 by Nikolaus Schaller, May 1, 2010
The RTC appears to be a PCF8563 http://www.nxp.com/documents/data_sheet/PCF8563.pdf connected to I2C.
Comment 2 by Nikolaus Schaller, May 3, 2010
Yes, it is a PCF8563. But debugging shows that it is most likely not a driver but a i2c problem.
Comment 3 by Nikolaus Schaller, May 3, 2010
There is a special i2c bus driver for the JZ47xx CPUs from Qi Hardware: http://projects.qi-hardware.com/index.php/p/ingenic-linux-02os-linux- 2-6-31-3/source/tree/89/trunk/drivers/i2c/busses And, we have nothing comparable in our source tree.
Comment 4 by Nikolaus Schaller, May 5, 2010
RTC now initializes. Main problem was the I2C bus driver and some config problems. Remaining issues: 1. the I2C connection is a little instable (sometimes time out) 2. it looks as if the rtc is read out several hundred times (which fills the dmesg unless we disable this debug message)