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| author | Thomas Lange <thomas@corelatus.se> | 2009-05-03 20:07:33 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2009-06-12 20:39:51 +0200 |
| commit | 2ae0f35fd60c7345446835b95a4daff356e1f031 (patch) | |
| tree | 1c7cce141811b1702b69083404f97da718189876 /cpu | |
| parent | 6cc7ba9ed43106946aa9aa868302aa2faf1d17be (diff) | |
| download | blackbird-obmc-uboot-2ae0f35fd60c7345446835b95a4daff356e1f031.tar.gz blackbird-obmc-uboot-2ae0f35fd60c7345446835b95a4daff356e1f031.zip | |
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>
Diffstat (limited to 'cpu')
| -rw-r--r-- | 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 a687d44035..ba0a7c3b4b 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 |
