add directory Minix

Minix/1.7.4/upgrade-1.7.4

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+How to upgrade from 1.7.2 to 1.7.4.
+
+First, the 'setup' script that used used for a normal installation now
+notices that a Minix system is already present and will offer to "upgrade"
+it.  This means that is will save the contents of /usr/ in /usr/.old/ and
+then install normally.  So the root file system is replaced, /usr is filled
+with new stuff, and you can rescue some old files from /usr/.old/.
+If you'd rather replace the source and recompile like real programmers do,
+then here is the list of steps to take:
+
+Note: Things you have to do as root are marked with a # sign.  The ! sign
+marks the actions of bin.
+
+# Replace the sources, that's /usr/include, /usr/man, and /usr/src, with
+  the 1.7.4 sources by extracting the SYS.nn images in the normal way.
+  (Don't forget to move or remove the 1.7.2 stuff.)
+
+! All 1.7.4 commands can run under 1.7.2, and all 1.7.2 commands can run
+  under 1.7.4 if BINCOMPAT and SRCCOMPAT are set to 1 in <minix/config.h>.
+  Nothing really interesting changed in this upgrade to make things difficult.
+
+! Move to /usr/src/lib and type 'make install'.  You need new libraries
+  for the new kernel.
+
+! Customize /usr/include/minix/config.h to add or remove drivers.  In
+  /usr/src/tools type 'make hdboot'.  The /minix file should automatically
+  be transformed into a directory containing both the old 1.7.2 and the
+  new 1.7.4 kernel.  The newest of these two is chosen on boot.  Try it.
+  If it doesn't work then 'image=minix/old-image' is the way to recover if
+  it fails.
+
+! If it works then halt the system again to return to the boot monitor
+  prompt.  Now set 'rootdev' to the same value as 'ramimagedev'.  If your
+  system is a 286 then set the RAM disk size with 'ramsize' to as much as
+  you can spare up to 512 Mb for the so-called "second level cache".
+  (Minix-386 should have been configured with a large primary block cache.)
+  Type 'save' to record the changes.  Boot the system.
+
+! Your system should now be running 1.7.4.  Install the commands from CMD.nn
+  and use 'make install' in /usr/src to recompile the rest of the system.
+
+# Run 'checkhier' to check your top level directory tree.  It suggest
+  commands to execute to fix descrepancies in the top level directory
+  tree.
+
+# Compare all files in /usr/src/etc with those in /etc.  Some may have
+  changed and should be replaced.  Be careful not to lose changes you
+  have made to files in /etc.