svn commit: r261043 - head/sys/conf

[Warner Losh]

Author: imp
Date: Wed Jan 22 22:25:48 2014
New Revision: 261043
URL: http://svnweb.freebsd.org/changeset/base/261043

Log:
  Document EARLY_PRINTF

Modified:
  head/sys/conf/NOTES

Modified: head/sys/conf/NOTES
==============================================================================
--- head/sys/conf/NOTES	Wed Jan 22 22:19:53 2014	(r261042)
+++ head/sys/conf/NOTES	Wed Jan 22 22:25:48 2014	(r261043)
@@ -446,6 +446,15 @@ options 	DEBUG_MEMGUARD
 options 	DEBUG_REDZONE
 
 #
+# EARLY_PRINTF enables support for calling a special printf (eprintf)
+# very early in the kernel (before cn_init() has been called).  This
+# should only be used for debugging purposes early in boot.  Normally,
+# it is not defined.  It is commented out here because this feature
+# isn't generally available. And the required eputc() isn't defined.
+#
+#options	EARLY_PRINTF
+
+#
 # KTRACE enables the system-call tracing facility ktrace(2).  To be more
 # SMP-friendly, KTRACE uses a worker thread to process most trace events
 # asynchronously to the thread generating the event.  This requires a