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Discussion Groups | AT91SAM ARM | AT91SAM9260 (Rev. B) and RTT in Linux as RTC ?
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
AT91SAM9260 (Rev. B) and RTT in Linux as RTC ? - "manuel.sahm" - Jun 16 8:39:14 2008
Hello,
what should I have to do, to use the RTT of the At91SAM9260 as a
buffered RTC ?
If I set the date with "date 061611342008" the time is reseted after
reboot !!!!
Thank you very much
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
what should I have to do, to use the RTT of the At91SAM9260 as a
buffered RTC ?
If I set the date with "date 061611342008" the time is reseted after
reboot !!!!
Thank you very much
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: AT91SAM9260 (Rev. B) and RTT in Linux as RTC ? - 42Bastian - Jun 16 8:47:53 2008
manuel.sahm schrieb:
> what should I have to do, to use the RTT of the At91SAM9260 as a
> buffered RTC ?
>
> If I set the date with "date 061611342008" the time is reseted after
> reboot !!!!
Did you look into the driver-source ? It should tell you what happens.
--
42Bastian
Note: SPAM-only account, direct mail to bs42@...
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
> what should I have to do, to use the RTT of the At91SAM9260 as a
> buffered RTC ?
>
> If I set the date with "date 061611342008" the time is reseted after
> reboot !!!!
Did you look into the driver-source ? It should tell you what happens.
--
42Bastian
Note: SPAM-only account, direct mail to bs42@...
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: AT91SAM9260 (Rev. B) and RTT in Linux as RTC ? - twgbonehead - Jun 17 15:47:46 2008
Hi!
It's kind of hard to answer this question without a little more context.
When you say "After a restart" are you talking about doing a "shutdown
-r now" kind of command, or a power-cycle? If you're cycling the
power, what's your backup supply, and where's it going to?
If the time gets reset on a soft restart, such as a "shutdown"
command, you need to look at both the low-level hardware
initialization, as well as the higher-level system init (either
inittab or the init.d or rc.d stuff depending on how your particular
kernel handles initialization).
--- In A...@yahoogroups.com, "manuel.sahm" wrote:
>
> Hello,
>
> what should I have to do, to use the RTT of the At91SAM9260 as a
> buffered RTC ?
>
> If I set the date with "date 061611342008" the time is reseted after
> reboot !!!!
>
> Thank you very much
>
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
It's kind of hard to answer this question without a little more context.
When you say "After a restart" are you talking about doing a "shutdown
-r now" kind of command, or a power-cycle? If you're cycling the
power, what's your backup supply, and where's it going to?
If the time gets reset on a soft restart, such as a "shutdown"
command, you need to look at both the low-level hardware
initialization, as well as the higher-level system init (either
inittab or the init.d or rc.d stuff depending on how your particular
kernel handles initialization).
--- In A...@yahoogroups.com, "manuel.sahm"
>
> Hello,
>
> what should I have to do, to use the RTT of the At91SAM9260 as a
> buffered RTC ?
>
> If I set the date with "date 061611342008" the time is reseted after
> reboot !!!!
>
> Thank you very much
>
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )