diff --git a/boards/sim/sim/sim/configs/nsh2/Make.defs b/boards/sim/sim/sim/configs/nsh2/Make.defs
deleted file mode 100644
index 04f5f97a8d8..00000000000
--- a/boards/sim/sim/sim/configs/nsh2/Make.defs
+++ /dev/null
@@ -1,147 +0,0 @@
-############################################################################
-# boards/sim/sim/sim/configs/nsh2/Make.defs
-#
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.  The
-# ASF licenses this file to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance with the
-# License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-############################################################################
-
-include ${TOPDIR}/.config
-include ${TOPDIR}/tools/Config.mk
-
-HOSTOS = ${shell uname -o 2>/dev/null || uname -s 2>/dev/null || echo "Other"}
-
-ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
-  ARCHOPTIMIZATION	= -g
-endif
-
-ifneq ($(CONFIG_DEBUG_NOOPT),y)
-  ARCHOPTIMIZATION += -O2 -fno-strict-aliasing
-endif
-
-ARCHCPUFLAGS		= -fno-builtin
-ARCHCPUFLAGSXX		= -fno-builtin -fno-exceptions -fcheck-new -fno-rtti
-ARCHPICFLAGS		= -fpic
-ARCHWARNINGS		= -Wall -Wstrict-prototypes -Wshadow -Wundef
-ARCHWARNINGSXX		= -Wall -Wshadow -Wundef
-ARCHDEFINES		=
-ARCHDEFINESXX		= -DCONFIG_WCHAR_BUILTIN
-ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
-ARCHINCLUDESXX		= -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
-ARCHSCRIPT		=
-
-# Add -fno-common because macOS "ld -r" doesn't seem to pick objects
-# for common symbols.
-ARCHCPUFLAGS += -fno-common
-ARCHCPUFLAGSXX += -fno-common
-
-ifeq ($(CONFIG_SIM_M32),y)
-  ARCHCPUFLAGS		+= -m32
-  ARCHCPUFLAGSXX	+= -m32
-endif
-
-CROSSDEV		=
-CC			= $(CROSSDEV)cc
-CXX			= $(CROSSDEV)c++
-CPP			= $(CROSSDEV)cc -E
-LD			= $(CROSSDEV)ld
-AR			= $(CROSSDEV)ar rcs
-NM			= $(CROSSDEV)nm
-OBJCOPY			= $(CROSSDEV)objcopy
-OBJDUMP			= $(CROSSDEV)objdump
-
-CFLAGS			= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
-			  $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
-CXXFLAGS		= $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) \
-			  $(ARCHCPUFLAGSXX) $(ARCHINCLUDESXX) $(ARCHDEFINESXX) $(EXTRAFLAGS) -pipe
-CPPFLAGS		= $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
-AFLAGS			= $(CFLAGS) -D__ASSEMBLY__
-
-# Loadable module definitions
-
-CMODULEFLAGS = $(CFLAGS)
-# -fno-pic to avoid GOT relocations
-CMODULEFLAGS += -fno-pic
-
-LDMODULEFLAGS = -r -e module_initialize
-ifeq ($(WINTOOL),y)
-  LDMODULEFLAGS += -T "${shell cygpath -w $(TOPDIR)/libs/libc/modlib/gnu-elf.ld}"
-else
-  LDMODULEFLAGS += -T $(TOPDIR)/libs/libc/modlib/gnu-elf.ld
-endif
-
-# NuttX modules are ELF binaries.
-# Non-ELF platforms like macOS need to use a separate ELF toolchain.
-ifeq ($(CONFIG_HOST_MACOS),y)
-  # eg. brew install x86_64-elf-gcc
-  MODULECC = x86_64-elf-gcc
-  MODULELD = x86_64-elf-ld
-  MODULESTRIP = x86_64-elf-strip --strip-unneeded
-  # It seems macOS/x86_64 loads the program text around 00000001_xxxxxxxx.
-  # The gcc default (-mcmodel=small) would produce out-of-range 32-bit
-  # relocations.
-  CMODULEFLAGS += -mcmodel=large
-endif
-
-# ELF module definitions
-
-CELFFLAGS = $(CFLAGS)
-CXXELFFLAGS = $(CXXFLAGS)
-# -fno-pic to avoid GOT relocations
-CELFFLAGS += -fno-pic
-CXXELFFLAGS += -fno-pic
-
-LDELFFLAGS = -r -e main
-ifeq ($(WINTOOL),y)
-  LDELFFLAGS += -T "${shell cygpath -w $(TOPDIR)/boards/$(CONFIG_ARCH)/$(CONFIG_ARCH_CHIP)/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld}"
-else
-  LDELFFLAGS += -T $(TOPDIR)/boards/$(CONFIG_ARCH)/$(CONFIG_ARCH_CHIP)/$(CONFIG_ARCH_BOARD)/scripts/gnu-elf.ld
-endif
-
-
-ASMEXT			= .S
-OBJEXT			= .o
-LIBEXT			= .a
-
-ifeq ($(HOSTOS),Cygwin)
-  EXEEXT		= .exe
-else
-  EXEEXT		=
-endif
-
-LDLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(LD)
-CCLINKFLAGS		= $(ARCHSCRIPT)	# Link flags used with $(CC)
-LDFLAGS			= $(ARCHSCRIPT)	# For backward compatibility, same as CCLINKFLAGS
-
-ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
-  CCLINKFLAGS		+= -g
-endif
-
-ifeq ($(CONFIG_SIM_M32),y)
-  LDLINKFLAGS		+= -melf_i386
-  CCLINKFLAGS		+= -m32
-  LDFLAGS		+= -m32
-  LDMODULEFLAGS		+= -melf_i386
-  LDELFFLAGS		+= -melf_i386
-  HOSTLDFLAGS		+= -m32
-endif
-
-
-MKDEP			= $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
-
-HOSTCC			= cc
-HOSTINCLUDES		= -I.
-HOSTCFLAGS		= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
-			  $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe