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From: Thomas Lange <thomas@corelatus.se>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled
Date: Sun, 03 May 2009 20:07:33 +0200	[thread overview]
Message-ID: <49FDDD65.9010607@corelatus.se> (raw)

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 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

             reply	other threads:[~2009-05-03 18:07 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-03 18:07 Thomas Lange [this message]
2009-05-15 21:01 ` [U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled Jean-Christophe PLAGNIOL-VILLARD

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