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-rw-r--r--README11
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diff --git a/README b/README
index 3182df3..9ad3b23 100644
--- a/README
+++ b/README
@@ -30,6 +30,17 @@ How to Build:
. to test param_array.c
- make EXTRA_DEBUG_MSG=yes async_test
. to test async_veri.c
+ - make EXTRA_DEBUG_MSG=yes redtty_test
+ . to test redirect_ttyprintk.c
+
+4. redtty_test is a useful tool to assist STM Dummy driver testing. It uses
+ /dev/ttyprintk as the message output channel for STM Dummy device. When
+ enabled (./redtty_test on), all message to STM Dummy driver will be
+ redirect to /dev/ttyprintk, who will then write these message to kernel log.
+ And user can view these messages using kernel log tool, such as dmesg.
+
+Usage: please run ./redtty_test with no args:
+$ ./redtty_test
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How to use: