Cosmetic: Updates to TODO anre README text

TODO

@@ -2265,7 +2265,7 @@ o z16 (arch/z16)
                reliable Windows native build.  As of this writing, the Cygwin
                based build has not been re-verified.
   Status:      Open
-  Priority:    Low -- I don't think anyone uses the Z16 port.
+  Priority:    Low -- I don't think anyone uses the Z16 port with the native build.
 
 o mc68hc1x (arch/hc)
   ^^^^^^^^^^^^^^^^^^

configs/sim/README.txt

@@ -248,6 +248,18 @@ mount
     cd <nuttx-directory>/tools
     ./configure.sh sim/mount
 
+  NOTES
+  -----
+
+  1. This configuration uses the mconf-based configuration tool.  To
+     change this configuration using that tool, you should:
+
+     a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+        and misc/tools/
+
+     b. Execute 'make menuconfig' in nuttx/ in order to start the
+        reconfiguration process.
+
 mtdpart
 
   This is the apps/examples/mtdpart test using a MTD RAM driver to
@@ -268,6 +280,12 @@ nettest
   - The NuttX network is not, however, functional on the Linux TAP
     device yet.
 
+    UPDATE:  The TAP device does apparently work according to a NuttX
+    user (provided that it is not used with NSH: NSH waits on readline()
+    for console input.  When it calls readline(), the whole system blocks
+    waiting from input from the host OS).  My failure to get the TAP
+    device working appears to have been a cockpit error.
+
   - As of NuttX-5.18, when built on Windows, this test does not try
     to use the TAP device (which is not available on Cygwin anyway), 
     but inside will try to use the Cygwin WPCAP library.  Only the

configs/z16f2800100zcog/README.txt

@@ -1,10 +1,10 @@
 README.txt
-^^^^^^^^^^
+==========
 
 This is the README file for the NuttX port to the ZiLog ZNEO MCU.
 
 ZDS-II Compiler Versions
-^^^^^^^^^^^^^^^^^^^^^^^^
+========================
 
 Version 4.10.2
 
@@ -54,11 +54,12 @@ Other Versions
   5.0.1 to whatever.
 
 Issues
-^^^^^^
+======
 
-There are several, important open issues with the ZNEO port (8 as of this writing).
+There are several, important open issues with the ZNEO port (9 as of this writing).
 See the TODO file in the top-level NuttX directory.  One of these should be
-mentioned here because it causes a failure to compile Nuttx:
+mentioned here because it causes a failure to compile with older versions of
+Nuttx:
 
   Description: The file drivers/mmcsd/mmcsd_sdio.c generates an internal compiler
                error like:
@@ -68,18 +69,17 @@ mentioned here because it causes a failure to compile Nuttx:
                    File <c3>, Args(562,46)
 
   Status:     Open.  Recommended workaround: remove mmcsd_sdio.c from
-              drivers/mmcsd/Make.defs.  There is no SDIO support for the Z16 anyway
+              drivers/mmcsd/Make.defs.  There is no SDIO support for the Z16
+              anyway
   Priority:   Low
 
 This is bug in ZDS-II.  It was discovered in version 4.11.0 and still exists
-in version 4.11.1.
+in version 4.11.1.  I don't know about 5.0.1.  It is not a problem with recent
+versions of NuttX using any version because the file mmcsd_sdio.c is no longer
+built unconditionally.
 
-Configuration Subdirectories
+Selecting Configurations
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+========================
-
-- source/ and include/
-    These directories contain common logic for all z16f2800100zcog
-    configurations.
 
 Variations on the basic z8f162800100zcog configuration are maintained
 in subdirectories.  To configure any specific configuration, do the
@@ -92,7 +92,16 @@ following steps:
 
 Where <sub-directory> is the specific board configuration that you
 wish to build.  The following board-specific configurations are
-available:
+available.
+
+Configuration Sub-directories
+=============================
+
+source/ and include/
+--------------------
+
+  These directories contain common logic for all z16f2800100zcog
+  configurations.
 
 nsh
 ---