From 2ae0f35fd60c7345446835b95a4daff356e1f031 Mon Sep 17 00:00:00 2001
From: Thomas Lange <thomas@corelatus.se>
Date: Sun, 3 May 2009 20:07:33 +0200
Subject: [PATCH] ARM DaVinci: Reset with watchdog enabled

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@corelatus.se>
---
 cpu/arm926ejs/davinci/reset.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cpu/arm926ejs/davinci/reset.S b/cpu/arm926ejs/davinci/reset.S
index a687d44035c..ba0a7c3b4ba 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
-- 
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