diff --git a/configs/z8encore000zco/ostest/ostest.linkcmd b/configs/z8encore000zco/ostest/ostest.linkcmd
index 4c291a67eda..befb1ac7138 100755
--- a/configs/z8encore000zco/ostest/ostest.linkcmd
+++ b/configs/z8encore000zco/ostest/ostest.linkcmd
@@ -61,8 +61,7 @@ define _low_nearbss = base of NEAR_BSS
 define _len_nearbss = length of NEAR_BSS
 define _low_farbss = base of FAR_BSS
 define _len_farbss = length of FAR_BSS
-define _far_heaptop = highaddr of EDATA
-define _far_stack = highaddr of EDATA
+define _far_stacktop = highaddr of EDATA
 define _near_stack = highaddr of RDATA
 define _far_heapbot = top of EDATA
 define _near_heaptop = highaddr of RDATA
diff --git a/configs/z8encore000zco/ostest/ostest.zfpproj b/configs/z8encore000zco/ostest/ostest.zfpproj
index 0c65b6ec72a..d46a19859b4 100644
--- a/configs/z8encore000zco/ostest/ostest.zfpproj
+++ b/configs/z8encore000zco/ostest/ostest.zfpproj
@@ -1,8 +1,9 @@
 <project type="Standard" project-type="Standard" configuration="Debug" created-by="{{build_number}}" modified-by="b:4.10:06121401">
-<cpu>Z8F6423</cpu>
+<cpu>Z8F6403</cpu>
 
 <!-- file information -->
 <files>
+<file filter-key="">.\zsldevinit.asm</file>
 <file filter-key="flash">..\..\..\nuttx.hex</file>
 </files>
 
@@ -12,7 +13,129 @@
 <tools>
 <tool name="Assembler">
 <options>
-<option name="define" type="string" change-action="assemble">_Z8F6423=1,_Z8ENCORE_F642X=1</option>
+<option name="define" type="string" change-action="assemble">_Z8F6403=1,_Z8ENCORE_640_FAMILY=1,_Z8ENCORE_F640X=1</option>
+<option name="include" type="string" change-action="assemble"></option>
+<option name="list" type="boolean" change-action="none">true</option>
+<option name="listmac" type="boolean" change-action="none">false</option>
+<option name="name" type="boolean" change-action="none">true</option>
+<option name="pagelen" type="integer" change-action="none">56</option>
+<option name="pagewidth" type="integer" change-action="none">80</option>
+<option name="quiet" type="boolean" change-action="none">true</option>
+<option name="revaa" type="boolean" change-action="rebuild">true</option>
+<option name="sdiopt" type="boolean" change-action="assemble">true</option>
+</options>
+</tool>
+<tool name="Compiler">
+<options>
+<option name="codegen" type="string" change-action="none">UserDefined</option>
+<option name="const" type="string" change-action="compile">RAM</option>
+<option name="define" type="string" change-action="compile">_Z8F6403,_Z16F_SERIES,_Z8ENCORE_640_FAMILY,_Z8ENCORE_F640X</option>
+<option name="genprintf" type="boolean" change-action="compile">true</option>
+<option name="keepasm" type="boolean" change-action="none">false</option>
+<option name="keeplst" type="boolean" change-action="none">true</option>
+<option name="list" type="boolean" change-action="none">false</option>
+<option name="listinc" type="boolean" change-action="none">false</option>
+<option name="model" type="string" change-action="compile">L</option>
+<option name="optlink" type="boolean" change-action="compile">false</option>
+<option name="promote" type="boolean" change-action="compile">true</option>
+<option name="regvar" type="string" change-action="compile">Normal</option>
+<option name="regvarcache" type="string" change-action="none">Normal</option>
+<option name="reduceopt" type="boolean" change-action="compile">false</option>
+<option name="stdinc" type="string" change-action="compile"></option>
+<option name="usrinc" type="string" change-action="compile"></option>
+<option name="watch" type="boolean" change-action="none">false</option>
+</options>
+</tool>
+<tool name="Debugger">
+<options>
+<option name="target" type="string" change-action="rebuild">Z8ENCORE00ZC0</option>
+<option name="debugtool" type="string" change-action="none">Simulator</option>
+<option name="zemul_enableevents" type="boolean" change-action="none">false</option>
+<option name="zemul_brkonfull" type="boolean" change-action="none">false</option>
+<option name="usepageerase" type="boolean" change-action="none">true</option>
+</options>
+</tool>
+<tool name="FlashProgrammer">
+<options>
+<option name="erasebeforeburn" type="boolean" change-action="none">false</option>
+<option name="eraseinfopage" type="boolean" change-action="none">false</option>
+<option name="offset" type="integer" change-action="none">0</option>
+<option name="snenable" type="boolean" change-action="none">true</option>
+<option name="sn" type="string" change-action="none">000000000000000000000000</option>
+<option name="snsize" type="integer" change-action="none">1</option>
+<option name="snstep" type="integer" change-action="none">000000000000000000000001</option>
+<option name="snstepformat" type="integer" change-action="none">0</option>
+<option name="snaddress" type="string" change-action="none">0</option>
+<option name="snformat" type="integer" change-action="none">0</option>
+<option name="snbigendian" type="boolean" change-action="none">true</option>
+<option name="singleval" type="string" change-action="none">0</option>
+<option name="singlevalformat" type="integer" change-action="none">0</option>
+<option name="usenvds" type="boolean" change-action="none">false</option>
+<option name="includeserial" type="boolean" change-action="none">false</option>
+<option name="usepageerase" type="boolean" change-action="none">false</option>
+</options>
+</tool>
+<tool name="General">
+<options>
+<option name="warn" type="boolean" change-action="none">true</option>
+<option name="debug" type="boolean" change-action="assemble">true</option>
+<option name="debugcache" type="boolean" change-action="none">true</option>
+<option name="igcase" type="boolean" change-action="assemble">false</option>
+<option name="outputdir" type="string" change-action="compile">.</option>
+</options>
+</tool>
+<tool name="Librarian">
+<options>
+<option name="outfile" type="string" change-action="build">.\ostest.lib</option>
+</options>
+</tool>
+<tool name="Linker">
+<options>
+<option name="createnew" type="boolean" change-action="build">false</option>
+<option name="directives" type="string" change-action="build"></option>
+<option name="edata" type="string" change-action="build">100-EFF</option>
+<option name="exeform" type="string" change-action="build">OMF695,INTEL32</option>
+<option name="flash" type="string" change-action="build">FF80-FFFF</option>
+<option name="fplib" type="string" change-action="build">Dummy</option>
+<option name="linkctlfile" type="string" change-action="build"></option>
+<option name="map" type="boolean" change-action="none">true</option>
+<option name="maxhexlen" type="integer" change-action="build">64</option>
+<option name="nvds" type="string" change-action="build">0-f</option>
+<option name="objlibmods" type="string" change-action="build"></option>
+<option name="of" type="string" change-action="build">.\ostest</option>
+<option name="padhex" type="boolean" change-action="build">false</option>
+<option name="pram" type="string" change-action="build">0-f</option>
+<option name="praminuse" type="boolean" change-action="build">false</option>
+<option name="quiet" type="boolean" change-action="none">false</option>
+<option name="rdata" type="string" change-action="build">20-FF</option>
+<option name="relist" type="boolean" change-action="build">false</option>
+<option name="rom" type="string" change-action="build">0-FFF</option>
+<option name="sort" type="string" change-action="none">name</option>
+<option name="startuptype" type="string" change-action="build">Standard</option>
+<option name="startuplnkcmds" type="boolean" change-action="build">true</option>
+<option name="undefisfatal" type="boolean" change-action="none">true</option>
+<option name="useadddirectives" type="boolean" change-action="build">false</option>
+<option name="usecrun" type="boolean" change-action="build">true</option>
+<option name="warnisfatal" type="boolean" change-action="none">false</option>
+<option name="warnoverlap" type="boolean" change-action="none">true</option>
+<option name="xref" type="boolean" change-action="none">false</option>
+</options>
+</tool>
+<tool name="Middleware">
+<options>
+<option name="usezsl" type="boolean" change-action="rebuild">true</option>
+<option name="zslports" type="string" change-action="rebuild"></option>
+<option name="zsluarts" type="string" change-action="rebuild"></option>
+<option name="zslpramisrs" type="string" change-action="rebuild"></option>
+</options>
+</tool>
+</tools>
+</configuration>
+<configuration name="Release" >
+<tools>
+<tool name="Assembler">
+<options>
+<option name="define" type="string" change-action="assemble">_Z8F6403=1,_Z16F_SERIES=1,_Z8ENCORE_640_FAMILY=1,_Z8ENCORE_F640X=1</option>
 <option name="include" type="string" change-action="assemble"></option>
 <option name="list" type="boolean" change-action="none">true</option>
 <option name="listmac" type="boolean" change-action="none">false</option>
@@ -28,17 +151,17 @@
 <options>
 <option name="codegen" type="string" change-action="none">UserDefined</option>
 <option name="const" type="string" change-action="compile">RAM</option>
-<option name="define" type="string" change-action="compile">_Z8F6423,_Z16F_SERIES,_Z8ENCORE_F642X</option>
+<option name="define" type="string" change-action="compile">_Z8F6403,_Z16F_SERIES,_Z8ENCORE_640_FAMILY,_Z8ENCORE_F640X</option>
 <option name="genprintf" type="boolean" change-action="compile">true</option>
 <option name="keepasm" type="boolean" change-action="none">false</option>
 <option name="keeplst" type="boolean" change-action="none">true</option>
 <option name="list" type="boolean" change-action="none">false</option>
 <option name="listinc" type="boolean" change-action="none">false</option>
-<option name="model" type="string" change-action="compile">L</option>
+<option name="model" type="string" change-action="compile">S</option>
 <option name="optlink" type="boolean" change-action="compile">false</option>
 <option name="promote" type="boolean" change-action="compile">true</option>
 <option name="regvar" type="string" change-action="compile">Normal</option>
-<option name="regvarcache" type="string" change-action="none">false</option>
+<option name="regvarcache" type="string" change-action="none">Normal</option>
 <option name="reduceopt" type="boolean" change-action="compile">false</option>
 <option name="stdinc" type="string" change-action="compile"></option>
 <option name="usrinc" type="string" change-action="compile"></option>
@@ -47,8 +170,8 @@
 </tool>
 <tool name="Debugger">
 <options>
-<option name="target" type="string" change-action="rebuild">Z8F64200100KIT</option>
-<option name="debugtool" type="string" change-action="none">USBSmartCable</option>
+<option name="target" type="string" change-action="rebuild"></option>
+<option name="debugtool" type="string" change-action="none">Simulator</option>
 <option name="zemul_enableevents" type="boolean" change-action="none">false</option>
 <option name="zemul_brkonfull" type="boolean" change-action="none">false</option>
 <option name="usepageerase" type="boolean" change-action="none">true</option>
@@ -59,10 +182,10 @@
 <option name="erasebeforeburn" type="boolean" change-action="none">false</option>
 <option name="eraseinfopage" type="boolean" change-action="none">false</option>
 <option name="offset" type="integer" change-action="none">0</option>
-<option name="snenable" type="boolean" change-action="none">true</option>
-<option name="sn" type="string" change-action="none">000000000000000000000000</option>
-<option name="snsize" type="integer" change-action="none">1</option>
-<option name="snstep" type="integer" change-action="none">000000000000000000000001</option>
+<option name="snenable" type="boolean" change-action="none">false</option>
+<option name="sn" type="string" change-action="none">0</option>
+<option name="snsize" type="integer" change-action="none">0</option>
+<option name="snstep" type="integer" change-action="none">1</option>
 <option name="snstepformat" type="integer" change-action="none">0</option>
 <option name="snaddress" type="string" change-action="none">0</option>
 <option name="snformat" type="integer" change-action="none">0</option>
@@ -108,143 +231,21 @@
 <option name="quiet" type="boolean" change-action="none">false</option>
 <option name="rdata" type="string" change-action="build">20-FF</option>
 <option name="relist" type="boolean" change-action="build">false</option>
-<option name="rom" type="string" change-action="build">000000-007FFF</option>
+<option name="rom" type="string" change-action="build">0-FFF</option>
 <option name="sort" type="string" change-action="none">name</option>
-<option name="startuptype" type="string" change-action="build">1</option>
+<option name="startuptype" type="string" change-action="build">Standard</option>
 <option name="startuplnkcmds" type="boolean" change-action="build">true</option>
 <option name="undefisfatal" type="boolean" change-action="none">true</option>
 <option name="useadddirectives" type="boolean" change-action="build">false</option>
 <option name="usecrun" type="boolean" change-action="build">true</option>
 <option name="warnisfatal" type="boolean" change-action="none">false</option>
-<option name="warnoverlap" type="boolean" change-action="none">false</option>
+<option name="warnoverlap" type="boolean" change-action="none">true</option>
 <option name="xref" type="boolean" change-action="none">false</option>
 </options>
 </tool>
 <tool name="Middleware">
 <options>
-<option name="usezsl" type="boolean" change-action="rebuild">false</option>
-<option name="zslports" type="string" change-action="rebuild"></option>
-<option name="zsluarts" type="string" change-action="rebuild"></option>
-<option name="zslpramisrs" type="string" change-action="rebuild"></option>
-</options>
-</tool>
-</tools>
-</configuration>
-<configuration name="Release" >
-<tools>
-<tool name="Assembler">
-<options>
-<option name="define" type="string" change-action="assemble">_Z8F6423=1,_Z16F_SERIES=1,_Z8ENCORE_F642X=1</option>
-<option name="include" type="string" change-action="assemble"></option>
-<option name="list" type="boolean" change-action="none">true</option>
-<option name="listmac" type="boolean" change-action="none">false</option>
-<option name="name" type="boolean" change-action="none">true</option>
-<option name="pagelen" type="integer" change-action="none">56</option>
-<option name="pagewidth" type="integer" change-action="none">80</option>
-<option name="quiet" type="boolean" change-action="none">true</option>
-<option name="revaa" type="boolean" change-action="rebuild">false</option>
-<option name="sdiopt" type="boolean" change-action="assemble">true</option>
-</options>
-</tool>
-<tool name="Compiler">
-<options>
-<option name="codegen" type="string" change-action="none">UserDefined</option>
-<option name="const" type="string" change-action="compile">RAM</option>
-<option name="define" type="string" change-action="compile">_Z8F6423,_Z16F_SERIES,_Z8ENCORE_F642X</option>
-<option name="genprintf" type="boolean" change-action="compile">true</option>
-<option name="keepasm" type="boolean" change-action="none">false</option>
-<option name="keeplst" type="boolean" change-action="none">false</option>
-<option name="list" type="boolean" change-action="none">false</option>
-<option name="listinc" type="boolean" change-action="none">false</option>
-<option name="model" type="string" change-action="compile">S</option>
-<option name="optlink" type="boolean" change-action="compile">false</option>
-<option name="promote" type="boolean" change-action="compile">true</option>
-<option name="regvar" type="string" change-action="compile">true</option>
-<option name="regvarcache" type="string" change-action="none">false</option>
-<option name="reduceopt" type="boolean" change-action="compile">false</option>
-<option name="stdinc" type="string" change-action="compile"></option>
-<option name="usrinc" type="string" change-action="compile"></option>
-<option name="watch" type="boolean" change-action="none">false</option>
-</options>
-</tool>
-<tool name="Debugger">
-<options>
-<option name="target" type="string" change-action="rebuild"></option>
-<option name="debugtool" type="string" change-action="none">ZPAKII</option>
-<option name="zemul_enableevents" type="boolean" change-action="none">false</option>
-<option name="zemul_brkonfull" type="boolean" change-action="none">false</option>
-<option name="usepageerase" type="boolean" change-action="none">true</option>
-</options>
-</tool>
-<tool name="FlashProgrammer">
-<options>
-<option name="erasebeforeburn" type="boolean" change-action="none">false</option>
-<option name="eraseinfopage" type="boolean" change-action="none">false</option>
-<option name="offset" type="integer" change-action="none">0</option>
-<option name="snenable" type="boolean" change-action="none">false</option>
-<option name="sn" type="string" change-action="none">0</option>
-<option name="snsize" type="integer" change-action="none">0</option>
-<option name="snstep" type="integer" change-action="none">1</option>
-<option name="snstepformat" type="integer" change-action="none">0</option>
-<option name="snaddress" type="string" change-action="none">0</option>
-<option name="snformat" type="integer" change-action="none">0</option>
-<option name="snbigendian" type="boolean" change-action="none">true</option>
-<option name="singleval" type="string" change-action="none">0</option>
-<option name="singlevalformat" type="integer" change-action="none">0</option>
-<option name="usenvds" type="boolean" change-action="none">false</option>
-<option name="includeserial" type="boolean" change-action="none">false</option>
-<option name="usepageerase" type="boolean" change-action="none">false</option>
-</options>
-</tool>
-<tool name="General">
-<options>
-<option name="warn" type="boolean" change-action="none">true</option>
-<option name="debug" type="boolean" change-action="assemble">false</option>
-<option name="debugcache" type="boolean" change-action="none">true</option>
-<option name="igcase" type="boolean" change-action="assemble">false</option>
-<option name="outputdir" type="string" change-action="compile">.</option>
-</options>
-</tool>
-<tool name="Librarian">
-<options>
-<option name="outfile" type="string" change-action="build"></option>
-</options>
-</tool>
-<tool name="Linker">
-<options>
-<option name="createnew" type="boolean" change-action="build">false</option>
-<option name="directives" type="string" change-action="build"></option>
-<option name="edata" type="string" change-action="build">100-EFF</option>
-<option name="exeform" type="string" change-action="build">OMF695,INTEL32</option>
-<option name="flash" type="string" change-action="build">FF80-FFFF</option>
-<option name="fplib" type="string" change-action="build">Dummy</option>
-<option name="linkctlfile" type="string" change-action="build"></option>
-<option name="map" type="boolean" change-action="none">true</option>
-<option name="maxhexlen" type="integer" change-action="build">64</option>
-<option name="nvds" type="string" change-action="build">0-f</option>
-<option name="objlibmods" type="string" change-action="build"></option>
-<option name="of" type="string" change-action="build">.\ostest</option>
-<option name="padhex" type="boolean" change-action="build">false</option>
-<option name="pram" type="string" change-action="build">0-f</option>
-<option name="praminuse" type="boolean" change-action="build">false</option>
-<option name="quiet" type="boolean" change-action="none">false</option>
-<option name="rdata" type="string" change-action="build">20-FF</option>
-<option name="relist" type="boolean" change-action="build">false</option>
-<option name="rom" type="string" change-action="build">000000-007FFF</option>
-<option name="sort" type="string" change-action="none">name</option>
-<option name="startuptype" type="string" change-action="build">1</option>
-<option name="startuplnkcmds" type="boolean" change-action="build">true</option>
-<option name="undefisfatal" type="boolean" change-action="none">true</option>
-<option name="useadddirectives" type="boolean" change-action="build">false</option>
-<option name="usecrun" type="boolean" change-action="build">true</option>
-<option name="warnisfatal" type="boolean" change-action="none">false</option>
-<option name="warnoverlap" type="boolean" change-action="none">false</option>
-<option name="xref" type="boolean" change-action="none">false</option>
-</options>
-</tool>
-<tool name="Middleware">
-<options>
-<option name="usezsl" type="boolean" change-action="rebuild">false</option>
+<option name="usezsl" type="boolean" change-action="rebuild">true</option>
 <option name="zslports" type="string" change-action="rebuild"></option>
 <option name="zsluarts" type="string" change-action="rebuild"></option>
 <option name="zslpramisrs" type="string" change-action="rebuild"></option>