Dear David,
in message [ref] 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@denx.de
"It is better to have tried and failed than to have failed to try,
but the result's the same." - Mike Dennison
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