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SAMA5 WDT: Miss watchdog fixes

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This commit is contained in:
Gregory Nutt 2013-10-20 08:24:05 -06:00
parent 3f81f62b4b
commit 01ae0331a0
1 changed files with 14 additions and 3 deletions
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17
configs/sama5d3x-ek/README.txt
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@ -1006,7 +1006,7 @@ Configurations
5. The Real Time Clock/Calendar RTC) is enabled. These are the relevant
settings:
System Type:
CONFIG_SAMA5_RTC=y : Enable the RTC driver
@ -2152,7 +2152,7 @@ Configurations
Defaults should be okay for all related settings.
17. The Real Time Clock/Calendar RTC) may be enabled with these settings:
System Type:
CONFIG_SAMA5_RTC=y : Enable the RTC driver
@ -2182,13 +2182,24 @@ Configurations
CONFIG_WATCHDOG=y : Enables watchdog timer driver support
Application Configuration -> Eamples
CONFIG_EXAMPLES_WATCHDOG=y : Enable the apps/examples/watchdog
CONFIG_EXAMPLES_WATCHDOG=y : Enable apps/examples/watchdog
The WDT timer is driven off the slow, 32768Hz clock divided by 128.
As a result, the watchdog a maximum timeout value of 16 seconds. The
SAMA5 WDT may also only be programmed one time; the processor must be
reset before the WDT can be reprogrammed.
The SAMA5 always boots with the watchdog timer enabled at its maximum
timeout (16 seconds). In the normal case where no watchdog timer driver
has been configured, the watchdog timer is disabled as part of the start
up logic. But, since we are permitted only one opportunity to program
the WDT, we cannot disable the watchdog time if CONFIG_SAMA5_WDT=y. So,
be forewarned: You have only 16 seconds to run your watchdog timer test!
NOTE: If you are using the norboot program to run from FLASH as I did,
beware that the default version also disables the watchdog. You will
need a special version of norboot with CONFIG_SAMA5_WDT=y.
STATUS:
PCK FREQUENCY