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Diffstat (limited to 'doc/README.silent')
| -rw-r--r-- | doc/README.silent | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/doc/README.silent b/doc/README.silent new file mode 100644 index 0000000000..f2628a6bf8 --- /dev/null +++ b/doc/README.silent @@ -0,0 +1,22 @@ +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. + +The following actions are taken if "silent" is set at boot time: + + - Until the console devices have been initialized, output has to be + suppressed by testing for the flag "GD_FLG_SILENT" in "gd->flags". + Currently only the messages for the TRAB board are handled in this + way. + + - 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. + + - 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. |