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| author | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
|---|---|---|
| committer | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
| commit | 92988a21ad4c4c9504295ccb580c9f806134471b (patch) | |
| tree | 5effc9f14170112450de05c67dafbe8d5034d595 /u-boot/doc/README.silent | |
| parent | ca2b506783b676c95762c54ea24dcfdaae1947c9 (diff) | |
| download | bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.zip bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.gz bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.bz2 | |
added boot script files to repository
Diffstat (limited to 'u-boot/doc/README.silent')
| -rw-r--r-- | u-boot/doc/README.silent | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/u-boot/doc/README.silent b/u-boot/doc/README.silent new file mode 100644 index 0000000..a26e3df --- /dev/null +++ b/u-boot/doc/README.silent @@ -0,0 +1,20 @@ +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". + + - 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 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. |