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| author | Rasmus Villemoes <rasmus.villemoes@prevas.dk> | 2019-06-05 16:06:43 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2019-07-08 20:04:13 +0200 |
| commit | 487e4e08221debb1ccf9cb2c249fac379b74cbb2 (patch) | |
| tree | f3d6d4c22f5debc716a315572b127bcf4835b6f9 /Documentation/watchdog | |
| parent | watchdog: introduce watchdog.open_timeout commandline parameter (diff) | |
| download | linux-487e4e08221debb1ccf9cb2c249fac379b74cbb2.tar.xz linux-487e4e08221debb1ccf9cb2c249fac379b74cbb2.zip | |
watchdog: introduce CONFIG_WATCHDOG_OPEN_TIMEOUT
This allows setting a default value for the watchdog.open_timeout
commandline parameter via Kconfig.
Some BSPs allow remote updating of the kernel image and root file
system, but updating the bootloader requires physical access. Hence, if
one has a firmware update that requires relaxing the
watchdog.open_timeout a little, the value used must be baked into the
kernel image itself and cannot come from the u-boot environment via the
kernel command line.
Being able to set the initial value in .config doesn't change the fact
that the value on the command line, if present, takes precedence, and is
of course immensely useful for development purposes while one has
console acccess, as well as usable in the cases where one can make a
permanent update of the kernel command line.
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'Documentation/watchdog')
| -rw-r--r-- | Documentation/watchdog/watchdog-parameters.txt | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt index 32d3606caa65..ec919dc895ff 100644 --- a/Documentation/watchdog/watchdog-parameters.txt +++ b/Documentation/watchdog/watchdog-parameters.txt @@ -11,10 +11,10 @@ modules. The watchdog core parameter watchdog.open_timeout is the maximum time, in seconds, for which the watchdog framework will take care of pinging a running hardware watchdog until userspace opens the corresponding -/dev/watchdogN device. A value of 0 (the default) means an infinite -timeout. Setting this to a non-zero value can be useful to ensure that -either userspace comes up properly, or the board gets reset and allows -fallback logic in the bootloader to try something else. +/dev/watchdogN device. A value of 0 means an infinite timeout. Setting +this to a non-zero value can be useful to ensure that either userspace +comes up properly, or the board gets reset and allows fallback logic +in the bootloader to try something else. ------------------------------------------------- |