[U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled
Thomas Lange
thomas at corelatus.se
Sun May 3 20:07:33 CEST 2009
Once the Davinci watchdog has been enabled, the timeout
value cannot be changed. If the timeout in use is long,
it can take a long time for card to reset. By writing
an invalid service key, we can trigger an immediate reset.
Signed-off-by: Thomas Lange <thomas at corelatus.se>
---
cpu/arm926ejs/davinci/reset.S | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/cpu/arm926ejs/davinci/reset.S b/cpu/arm926ejs/davinci/reset.S
index a687d44..ba0a7c3 100644
--- a/cpu/arm926ejs/davinci/reset.S
+++ b/cpu/arm926ejs/davinci/reset.S
@@ -50,6 +50,10 @@ reset_cpu:
str r1, [r0]
ldr r1, WDTCR_VAL2
str r1, [r0]
+ /* Write an invalid value to the WDKEY field to trigger
+ * an immediate watchdog reset */
+ mov r1, $0x4000
+ str r1, [r0]
nop
nop
nop
--
1.5.6.5
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