Re: RTC woes

Marc LeFevre schrieb:

I’m new to the list.

Welcome! :-)

 > I have an e500-based embedded Linux system running

a 2.6.22 kernel.  I have a PCF8563T i2c based RTC chip attached to the 
PPC i2c bus.  In my kernel config file I have selected 
CONFIG_RTC_INTF_DEV=y and CONFIG_RTC_DRV_PCF8563=y.  I do a mknod  for 
/dev/rtc as c 10 135 (standard Linux) and link /dev/rtc0 to it.

  > When I boot, get the following message:

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

2.6.22.x and 2.6.23.x i2c rtc code was quite messy around PCF8563.

3)       Does the PPC have some quirks regarding i2c operation that are 
at the root of this problem?

The RTC subsystem was improved quite a bit lately. Try 2.6.24' powerpc
architecture with a proper device tree instead. It works over here on
mpc8540 / mpc8548 whereas the older ones were just a waste of time.

Regards,

Clemens