mmc: omap_hsmmc: make it possible to compile out ADMA support

[people/ms/u-boot.git] / doc / README.silent

diff --git a/doc/README.silent b/doc/README.silent
index f2628a6bf8bc721eb8438cb8ea8a6e7321ca56a1..6d90a0ec40376d87f87c2ed549bd26fc6b0d07e2 100644 (file)
--- a/doc/README.silent
+++ b/doc/README.silent
@@ -1,22 +1,28 @@
 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:
 
  - 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.
+   #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.