* [U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled
@ 2009-05-03 18:07 Thomas Lange
2009-05-15 21:01 ` Jean-Christophe PLAGNIOL-VILLARD
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Lange @ 2009-05-03 18:07 UTC (permalink / raw)
To: u-boot
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled
2009-05-03 18:07 [U-Boot] [PATCH] ARM DaVinci: Reset with watchdog enabled Thomas Lange
@ 2009-05-15 21:01 ` Jean-Christophe PLAGNIOL-VILLARD
0 siblings, 0 replies; 2+ messages in thread
From: Jean-Christophe PLAGNIOL-VILLARD @ 2009-05-15 21:01 UTC (permalink / raw)
To: u-boot
On 20:07 Sun 03 May , Thomas Lange wrote:
> 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>
> ---
Applied to arm-next
Best Regards,
J.
^ permalink raw reply [flat|nested] 2+ messages in thread
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