Dear David, in message <200306191537.28949.david.jander at protonic.nl> you wrote: > > Thanks for all the answers I got over experience with the MPC852T. > One other thing I was investigating is the RTC. > What RTC solutionts are known for easy interfacing with MPC8xx processors, > that work under linux ? What's the standard ?
There is no standard. The choice is made by product requirements (price, accuracy, battery lifetime, etc). Then the driver is dapted - which usually is pretty trivial. > There are a number of PC-compatible RTC chips out there, but I don't seem to > like them much, because they're generally quite expensive, have a lot of > functionality which might be nice, but is not really needed in my case. > Any experience with smaller 1-bit (or SPI) RTC's under linux ? I'm looking > basically for a Battery-backuped time-keeping counter. See the existing driver; for example, in our kernel trees you will find support for the PCF8563, M41T11, DS12887 and similar RTCs.o This is not a big deal. Be careful though when running NTP on your system, especially when using a RTC with I2C or SPI interface. You will have to disable the 11 minute mode (see "man hwclock" for details). Best regards, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de "It is better to have tried and failed than to have failed to try, but the result's the same." - Mike Dennison ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
