yaffs Added a README to direct/timothy_tests/mirror_tests

Signed-off-by: Timothy Manning <tfhmanning@gmail.com>

diff --git a/direct/timothy_tests/mirror_tests/README.txt b/direct/timothy_tests/mirror_tests/README.txt
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+Made by Timothy Manning on 24/12/10 <timothy@yaffs.net>
+
+
+       mirror_tests is designed to check that yaffs behaves the same way as linux.
+       This is done by applying the same command to both linux and yaffs and 
+       then checking the output of the functions.
+       The default place for creating linux files is direct/timothy_tests/mirror_tests/tests/
+       This directory is removed and is recreated at the beginning of each test, 
+       However some of the files may be read only and cannot be deleted.
+       It is much better to remove this directory via the command line.
+
+       rm test/*;rmdir test/;./mirror_tests -n 100 -v
+
+Command line arguments
+       -yaffs_path [PATH] //sets the path for yaffs.
+       -linux_path [PATH] //sets the path for linux.
+       -p [NUMBER] //sets the print level for mirror_tests.
+       -v //verbose mode everything is printed
+       -q //quiet mode nothing is printed.
+       -n [number] //sets the number of random tests to run.
+       -s [number] //seeds rand with the number
+       -t [number] //sets yaffs_trace to the number
+       -clean //removes emfile and test dir
+