The config option CONFIG_SILENT_CONSOLE can be used to quiet messages
on the console. If the option has been enabled, the output can be
-silenced by setting the environment variable "silent". The variable
-is latched into the global data at an early stage in the boot process
-so deleting it with "setenv" will not take effect until the system is
-restarted.
+silenced by setting the environment variable "silent".
+
+- CONFIG_SILENT_CONSOLE_UPDATE_ON_SET
+ When the "silent" variable is changed with env set, the change
+ will take effect immediately.
+
+- CONFIG_SILENT_CONSOLE_UPDATE_ON_RELOC
+ Some environments are not available until relocation (e.g. NAND)
+ so this will make the value in the flash env take effect at
+ relocation.
The following actions are taken if "silent" is set at boot time:
- When the console devices have been initialized, "stdout" and
"stderr" are set to "nulldev", so subsequent messages are
suppressed automatically. Make sure to enable "nulldev" by
- #defining CFG_DEVICE_NULLDEV in your board config file.
+ #defining CONFIG_SYS_DEVICE_NULLDEV in your board config file.
- When booting a linux kernel, the "bootargs" are fixed up so that
the argument "console=" will be in the command line, no matter how
- it was set in "bootargs" before.
+ it was set in "bootargs" before. If you don't want the linux command
+ line to be affected, define CONFIG_SILENT_U_BOOT_ONLY in your board
+ config file as well, and this part of the feature will be disabled.