at91sam9: add watchdog support
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/doc/README.at91 b/doc/README.at91
index e460e66..9b4eae6 100644
--- a/doc/README.at91
+++ b/doc/README.at91
@@ -2,6 +2,7 @@
http://atmel.com/dyn/products/tools.asp?family_id=605#1443
+I. Board mapping & boot media
------------------------------------------------------------------------------
AT91SAM9260EK, AT91SAM9G20EK & AT91SAM9XEEK
------------------------------------------------------------------------------
@@ -86,3 +87,13 @@
make at91sam9263ek_config - use data flash (spi cs0) (default)
make at91sam9263ek_nandflash_config - use nand flash
make at91sam9263ek_dataflash_cs0_config - use data flash (spi cs0)
+
+II. Watchdog support
+
+ For security reasons, the at91 watchdog is running at boot time and,
+ if deactivated, cannot be used anymore.
+ If you want to use the watchdog, you will need to keep it running in
+ your code (make sure not to disable it in AT91Bootstrap for instance).
+
+ In the U-Boot configuration, the AT91 watchdog support is enabled using
+ the CONFIG_AT91SAM9_WATCHDOG and CONFIG_HW_WATCHDOG options.