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