diff --git a/arch/arm/src/common/Toolchain.defs b/arch/arm/src/common/Toolchain.defs
index e0f0583c1e0..f38ab852f09 100644
--- a/arch/arm/src/common/Toolchain.defs
+++ b/arch/arm/src/common/Toolchain.defs
@@ -572,7 +572,7 @@ ifneq ($(CONFIG_BUILD_KERNEL),y)
   LDELFFLAGS += $(TOPDIR)$(DELIM)arch$(DELIM)arm$(DELIM)src$(DELIM)crt0.o
 endif
 
-LDELFFLAGS += -e __start -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
+LDELFFLAGS += -e _start -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
 
 # Zig toolchain
 
diff --git a/arch/arm/src/common/crt0.c b/arch/arm/src/common/crt0.c
index ccdb94428ff..d552161b50b 100644
--- a/arch/arm/src/common/crt0.c
+++ b/arch/arm/src/common/crt0.c
@@ -141,7 +141,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -160,7 +160,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 
diff --git a/arch/arm64/src/Toolchain.defs b/arch/arm64/src/Toolchain.defs
index 6d9a6cd0c18..cb704ce85d8 100644
--- a/arch/arm64/src/Toolchain.defs
+++ b/arch/arm64/src/Toolchain.defs
@@ -288,7 +288,7 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden # --target1-abs
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden # --target1-abs
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 ifneq ($(CONFIG_BUILD_KERNEL),y)
   # Flat build and protected elf entry point use crt0,
   # Kernel build will use apps/import/scripts/crt0
diff --git a/arch/arm64/src/common/crt0.c b/arch/arm64/src/common/crt0.c
index b15a2e010ae..0bc58917ac2 100644
--- a/arch/arm64/src/common/crt0.c
+++ b/arch/arm64/src/common/crt0.c
@@ -148,7 +148,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -167,7 +167,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 
diff --git a/arch/risc-v/src/common/crt0.c b/arch/risc-v/src/common/crt0.c
index 73331e9fd3c..93ff42e4627 100644
--- a/arch/risc-v/src/common/crt0.c
+++ b/arch/risc-v/src/common/crt0.c
@@ -145,7 +145,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -164,7 +164,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 
diff --git a/arch/x86_64/src/common/Toolchain.defs b/arch/x86_64/src/common/Toolchain.defs
index 54f83f05363..5d0abca0ef7 100644
--- a/arch/x86_64/src/common/Toolchain.defs
+++ b/arch/x86_64/src/common/Toolchain.defs
@@ -258,7 +258,7 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 ifneq ($(CONFIG_BUILD_KERNEL),y)
   # Flat build and protected elf entry point use crt0,
   # Kernel build will use apps/import/scripts/crt0
diff --git a/arch/x86_64/src/common/crt0.c b/arch/x86_64/src/common/crt0.c
index 54b26ec1477..a095b0a3e97 100644
--- a/arch/x86_64/src/common/crt0.c
+++ b/arch/x86_64/src/common/crt0.c
@@ -130,7 +130,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -149,7 +149,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 
diff --git a/arch/xtensa/src/common/crt0.c b/arch/xtensa/src/common/crt0.c
index 5732057776a..89b21b78db0 100644
--- a/arch/xtensa/src/common/crt0.c
+++ b/arch/xtensa/src/common/crt0.c
@@ -96,7 +96,7 @@ static void exec_dtors(void)
  ****************************************************************************/
 
 /****************************************************************************
- * Name: __start
+ * Name: _start
  *
  * Description:
  *   This function is the low level entry point into the main thread of
@@ -115,7 +115,7 @@ static void exec_dtors(void)
  *
  ****************************************************************************/
 
-void __start(int argc, char *argv[])
+void _start(int argc, char *argv[])
 {
   int ret;
 
diff --git a/arch/xtensa/src/lx6/Toolchain.defs b/arch/xtensa/src/lx6/Toolchain.defs
index a5156e2ddea..fa860849944 100644
--- a/arch/xtensa/src/lx6/Toolchain.defs
+++ b/arch/xtensa/src/lx6/Toolchain.defs
@@ -232,7 +232,7 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden -mtext-section-literals
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden -mtext-section-literals
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
 ifneq ($(CONFIG_BUILD_KERNEL),y)
   # Flat build and protected elf entry point use crt0,
diff --git a/arch/xtensa/src/lx7/Toolchain.defs b/arch/xtensa/src/lx7/Toolchain.defs
index 3d84a19b1b8..16e5c93971c 100644
--- a/arch/xtensa/src/lx7/Toolchain.defs
+++ b/arch/xtensa/src/lx7/Toolchain.defs
@@ -236,7 +236,7 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden -mtext-section-literals
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden -mtext-section-literals
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
 ifneq ($(CONFIG_BUILD_KERNEL),y)
   # Flat build and protected elf entry point use crt0,
diff --git a/tools/toolchain.cmake.export b/tools/toolchain.cmake.export
index a5542b5dd4a..7cf06b4d65e 100644
--- a/tools/toolchain.cmake.export
+++ b/tools/toolchain.cmake.export
@@ -22,8 +22,9 @@ set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
 add_compile_options(-nostdlib)
 add_compile_options(-ffunction-sections -fdata-sections)
 
-# same entry used for all build modes in crt0.c and arch/.../xxx_start.c
-set(ENTRY_NAME "__start")
+# same entry used for all build modes in crt0.c
+
+set(ENTRY_NAME "_start")
 
 set(CMAKE_C_LINK_EXECUTABLE
     "<CMAKE_LINKER> ${LDFLAGS} --entry=${ENTRY_NAME} -T${LINKER_SCRIPT} <OBJECTS> -o <TARGET> <LINK_LIBRARIES> -L${NUTTX_PATH}/libs --start-group ${LDLIBS} ${EXTRA_LIBS} --end-group"