mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 13:14:27 +00:00
7e15638d60
This converts the following to Kconfig: CONFIG_SYS_DEVICE_NULLDEV Signed-off-by: Simon Glass <sjg@chromium.org>
28 lines
1.3 KiB
Text
28 lines
1.3 KiB
Text
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".
|
|
|
|
- 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:
|
|
|
|
- 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
|
|
enabling CONFIG_SYS_DEVICE_NULLDEV in your board defconfig 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. 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.
|