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ARM DaVinci: Reset with watchdog enabled

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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>
This commit is contained in:
Thomas Lange 2009-05-03 20:07:33 +02:00 committed by Wolfgang Denk
parent 6cc7ba9ed4
commit 2ae0f35fd6
1 changed files with 4 additions and 0 deletions
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4
cpu/arm926ejs/davinci/reset.S
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@ -50,6 +50,10 @@ reset_cpu:
str r1, [r0] str r1, [r0]
ldr r1, WDTCR_VAL2 ldr r1, WDTCR_VAL2
str r1, [r0] 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 nop
nop nop