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-rw-r--r--sys/conf/NOTES9
1 files changed, 9 insertions, 0 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index b537797..9d74130 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -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
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