diff --git a/arch/risc-v/src/esp32c3/Make.defs b/arch/risc-v/src/esp32c3/Make.defs
index 469cb1ebb4e..58a6f13eff0 100644
--- a/arch/risc-v/src/esp32c3/Make.defs
+++ b/arch/risc-v/src/esp32c3/Make.defs
@@ -35,7 +35,7 @@ CMN_ASRCS := $(filter-out riscv_vectors.S,$(CMN_ASRCS))
 # Specify our C code within this directory to be included
 
 CHIP_CSRCS  = esp32c3_allocateheap.c esp32c3_start.c esp32c3_wdt.c esp32c3_idle.c
-CHIP_CSRCS += esp32c3_irq.c
+CHIP_CSRCS += esp32c3_irq.c esp32c3_libc_stubs.c
 CHIP_CSRCS += esp32c3_clockconfig.c esp32c3_gpio.c
 CHIP_CSRCS += esp32c3_lowputc.c esp32c3_serial.c
 CHIP_CSRCS += esp32c3_systemreset.c esp32c3_resetcause.c
diff --git a/arch/risc-v/src/esp32c3/esp32c3_libc_stubs.c b/arch/risc-v/src/esp32c3/esp32c3_libc_stubs.c
new file mode 100644
index 00000000000..4c6a1e290e2
--- /dev/null
+++ b/arch/risc-v/src/esp32c3/esp32c3_libc_stubs.c
@@ -0,0 +1,317 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/esp32c3_libc_stubs.c
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include <nuttx/mutex.h>
+#include "rom/esp32c3_libc_stubs.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define _lock_t int
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+static mutex_t g_nxlock_common;
+static mutex_t g_nxlock_recursive;
+
+/* Forward declaration */
+
+struct _reent;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int _close_r(struct _reent *r, int fd)
+{
+  return close(fd);
+}
+
+int _fstat_r(struct _reent *r, int fd, struct stat *statbuf)
+{
+  return fstat(fd, statbuf);
+}
+
+int _getpid_r(struct _reent *r)
+{
+  return getpid();
+}
+
+int _kill_r(struct _reent *r, int pid, int sig)
+{
+  return kill(pid, sig);
+}
+
+int _link_r(struct _reent *r, const char *oldpath,
+                      const char *newpath)
+{
+  /* TODO */
+
+  return 0;
+}
+
+int _lseek_r(struct _reent *r, int fd, int offset, int whence)
+{
+  return lseek(fd, offset, whence);
+}
+
+int _open_r(struct _reent *r, const char *pathname,
+                      int flags, int mode)
+{
+  return open(pathname, flags, mode);
+}
+
+int _read_r(struct _reent *r, int fd, void *buf, int count)
+{
+  return read(fd, buf, count);
+}
+
+int _rename_r(struct _reent *r, const char *oldpath,
+                        const char *newpath)
+{
+  return rename(oldpath, newpath);
+}
+
+void *_sbrk_r(struct _reent *r, ptrdiff_t increment)
+{
+  /* TODO: sbrk is only supported on Kernel mode */
+
+  errno = -ENOMEM;
+  return (void *) -1;
+}
+
+int _stat_r(struct _reent *r, const char *pathname,
+                      struct stat *statbuf)
+{
+  return stat(pathname, statbuf);
+}
+
+clock_t _times_r(struct _reent *r, struct tms *buf)
+{
+  return times(buf);
+}
+
+int _unlink_r(struct _reent *r, const char *pathname)
+{
+  return unlink(pathname);
+}
+
+int _write_r(struct _reent *r, int fd, const void *buf, int count)
+{
+  return write(fd, buf, count);
+}
+
+int _gettimeofday_r(struct _reent *r, struct timeval *tv, void *tz)
+{
+  return gettimeofday(tv, tz);
+}
+
+void *_malloc_r(struct _reent *r, size_t size)
+{
+  return malloc(size);
+}
+
+void *_realloc_r(struct _reent *r, void *ptr, size_t size)
+{
+  return realloc(ptr, size);
+}
+
+void *_calloc_r(struct _reent *r, size_t nmemb, size_t size)
+{
+  return calloc(nmemb, size);
+}
+
+void _free_r(struct _reent *r, void *ptr)
+{
+  free(ptr);
+}
+
+void _abort(void)
+{
+  abort();
+}
+
+void _raise_r(struct _reent *r)
+{
+  /* FIXME */
+}
+
+void _lock_init(_lock_t *lock)
+{
+  nxmutex_init(&g_nxlock_common);
+  nxsem_get_value(&g_nxlock_common, lock);
+}
+
+void _lock_init_recursive(_lock_t *lock)
+{
+  nxmutex_init(&g_nxlock_recursive);
+  nxsem_get_value(&g_nxlock_recursive, lock);
+}
+
+void _lock_close(_lock_t *lock)
+{
+  nxmutex_destroy(&g_nxlock_common);
+  *lock = 0;
+}
+
+void _lock_close_recursive(_lock_t *lock)
+{
+  nxmutex_destroy(&g_nxlock_recursive);
+  *lock = 0;
+}
+
+void _lock_acquire(_lock_t *lock)
+{
+  nxmutex_lock(&g_nxlock_common);
+  nxsem_get_value(&g_nxlock_common, lock);
+}
+
+void _lock_acquire_recursive(_lock_t *lock)
+{
+  nxmutex_lock(&g_nxlock_recursive);
+  nxsem_get_value(&g_nxlock_recursive, lock);
+}
+
+int _lock_try_acquire(_lock_t *lock)
+{
+  nxmutex_trylock(&g_nxlock_common);
+  nxsem_get_value(&g_nxlock_common, lock);
+  return 0;
+}
+
+int _lock_try_acquire_recursive(_lock_t *lock)
+{
+  nxmutex_trylock(&g_nxlock_recursive);
+  nxsem_get_value(&g_nxlock_recursive, lock);
+  return 0;
+}
+
+void _lock_release(_lock_t *lock)
+{
+  nxmutex_unlock(&g_nxlock_common);
+  nxsem_get_value(&g_nxlock_common, lock);
+}
+
+void _lock_release_recursive(_lock_t *lock)
+{
+  nxmutex_unlock(&g_nxlock_recursive);
+  nxsem_get_value(&g_nxlock_recursive, lock);
+}
+
+struct _reent *__getreent(void)
+{
+  /* TODO */
+
+  return (struct _reent *) NULL;
+}
+
+int _system_r(struct _reent *r, const char *command)
+{
+  /* TODO: Implement system() */
+
+  return 0;
+}
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct syscall_stub_table g_stub_table =
+{
+    .__getreent = &__getreent,
+    ._malloc_r = &_malloc_r,
+    ._free_r = &_free_r,
+    ._realloc_r = &_realloc_r,
+    ._calloc_r = &_calloc_r,
+    ._abort = NULL,
+    ._system_r = &_system_r,
+    ._rename_r = &_rename_r,
+    ._times_r = &_times_r,
+    ._gettimeofday_r = &_gettimeofday_r,
+    ._raise_r = &_raise_r,
+    ._unlink_r = &_unlink_r,
+    ._link_r = &_link_r,
+    ._stat_r = &_stat_r,
+    ._fstat_r = &_fstat_r,
+    ._sbrk_r = &_sbrk_r,
+    ._getpid_r = &_getpid_r,
+    ._kill_r = &_kill_r,
+    ._exit_r = NULL,
+    ._close_r = &_close_r,
+    ._open_r = &_open_r,
+    ._write_r = &_write_r,
+    ._lseek_r = &_lseek_r,
+    ._read_r = &_read_r,
+    ._lock_init = &_lock_init,
+    ._lock_init_recursive = &_lock_init_recursive,
+    ._lock_close = &_lock_close,
+    ._lock_close_recursive = &_lock_close_recursive,
+    ._lock_acquire = &_lock_acquire,
+    ._lock_acquire_recursive = &_lock_acquire_recursive,
+    ._lock_try_acquire = &_lock_try_acquire,
+    ._lock_try_acquire_recursive = &_lock_try_acquire_recursive,
+    ._lock_release = &_lock_release,
+    ._lock_release_recursive = &_lock_release_recursive,
+    ._printf_float = NULL,
+    ._scanf_float = NULL,
+};
+
+/****************************************************************************
+ * Name: setup_syscall_table
+ *
+ * Description:
+ *   Configure the syscall table used by the ROM code for calling C library
+ *   functions.
+ *   ESP32-C3 ROM code contains implementations of some of C library
+ *   functions. Whenever a function in ROM needs to use a syscall, it calls
+ *   a pointer to the corresponding syscall implementation defined in the
+ *   syscall_stub_table struct.
+ *
+ * Input Parameters:
+ *   None.
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+void setup_syscall_table(void)
+{
+  syscall_table_ptr = &g_stub_table;
+}
+
diff --git a/arch/risc-v/src/esp32c3/esp32c3_start.c b/arch/risc-v/src/esp32c3/esp32c3_start.c
index c5adb08f2e8..25dd57f5e41 100644
--- a/arch/risc-v/src/esp32c3/esp32c3_start.c
+++ b/arch/risc-v/src/esp32c3/esp32c3_start.c
@@ -47,6 +47,7 @@
 #endif
 #include "hardware/esp32c3_cache_memory.h"
 #include "hardware/extmem_reg.h"
+#include "rom/esp32c3_libc_stubs.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -293,6 +294,10 @@ void __esp32c3_start(void)
       *dest++ = 0;
     }
 
+  /* Setup the syscall table needed by the ROM code */
+
+  setup_syscall_table();
+
   showprogress('B');
 
   /* Disable any wdt enabled by bootloader */
diff --git a/arch/risc-v/src/esp32c3/rom/esp32c3_libc_stubs.h b/arch/risc-v/src/esp32c3/rom/esp32c3_libc_stubs.h
new file mode 100644
index 00000000000..d540acab44f
--- /dev/null
+++ b/arch/risc-v/src/esp32c3/rom/esp32c3_libc_stubs.h
@@ -0,0 +1,113 @@
+/****************************************************************************
+ * arch/risc-v/src/esp32c3/rom/esp32c3_libc_stubs.h
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_RISCV_SRC_ESP32C3_ROM_ESP32C3_LIBC_STUBS_H
+#define __ARCH_RISCV_SRC_ESP32C3_ROM_ESP32C3_LIBC_STUBS_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include <nuttx/mutex.h>
+
+#define _lock_t int
+
+/* Forward declaration */
+
+struct _reent;
+
+struct syscall_stub_table
+{
+    struct _reent *(* __getreent)(void);
+    void *(* _malloc_r)(struct _reent *r, size_t);
+    void (* _free_r)(struct _reent *r, void *);
+    void *(* _realloc_r)(struct _reent *r, void *, size_t);
+    void *(* _calloc_r)(struct _reent *r, size_t, size_t);
+    void (* _abort)(void);
+    int (* _system_r)(struct _reent *r, const char *);
+    int (* _rename_r)(struct _reent *r, const char *, const char *);
+    clock_t (* _times_r)(struct _reent *r, struct tms *);
+    int (* _gettimeofday_r) (struct _reent *r, struct timeval *, void *);
+    void (* _raise_r)(struct _reent *r);
+    int (* _unlink_r)(struct _reent *r, const char *);
+    int (* _link_r)(struct _reent *r, const char *, const char *);
+    int (* _stat_r)(struct _reent *r, const char *, struct stat *);
+    int (* _fstat_r)(struct _reent *r, int, struct stat *);
+    void *(* _sbrk_r)(struct _reent *r, ptrdiff_t);
+    int (* _getpid_r)(struct _reent *r);
+    int (* _kill_r)(struct _reent *r, int, int);
+    void (* _exit_r)(struct _reent *r, int);
+    int (* _close_r)(struct _reent *r, int);
+    int (* _open_r)(struct _reent *r, const char *, int, int);
+    int (* _write_r)(struct _reent *r, int, const void *, int);
+    int (* _lseek_r)(struct _reent *r, int, int, int);
+    int (* _read_r)(struct _reent *r, int, void *, int);
+    void (* _lock_init)(_lock_t *lock);
+    void (* _lock_init_recursive)(_lock_t *lock);
+    void (* _lock_close)(_lock_t *lock);
+    void (* _lock_close_recursive)(_lock_t *lock);
+    void (* _lock_acquire)(_lock_t *lock);
+    void (* _lock_acquire_recursive)(_lock_t *lock);
+    int (* _lock_try_acquire)(_lock_t *lock);
+    int (* _lock_try_acquire_recursive)(_lock_t *lock);
+    void (* _lock_release)(_lock_t *lock);
+    void (* _lock_release_recursive)(_lock_t *lock);
+    int (* _printf_float)(struct _reent *data, void *pdata, FILE *fp,
+                          int (*pfunc) (struct _reent *, FILE *,
+                          const char *, size_t len), va_list * ap);
+    int (* _scanf_float) (struct _reent *rptr, void *pdata, FILE *fp,
+                          va_list *ap);
+};
+
+extern const struct syscall_stub_table *syscall_table_ptr;
+
+/****************************************************************************
+ * Name: setup_syscall_table
+ *
+ * Description:
+ *   Configure the syscall table used by the ROM code for calling C library
+ *   functions.
+ *   ESP32-C3 ROM code contains implementations of some of C library
+ *   functions. Whenever a function in ROM needs to use a syscall, it calls
+ *   a pointer to the corresponding syscall implementation defined in the
+ *   syscall_stub_table struct.
+ *
+ * Input Parameters:
+ *   None.
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+void setup_syscall_table(void);
+
+#endif /* __ARCH_RISCV_SRC_ESP32C3_ROM_ESP32C3_LIBC_STUBS_H */
diff --git a/boards/risc-v/esp32c3/esp32c3-devkit-rust-1/scripts/esp32c3_rom.ld b/boards/risc-v/esp32c3/esp32c3-devkit-rust-1/scripts/esp32c3_rom.ld
index 8a0aee43bcd..d4a3152dd21 100644
--- a/boards/risc-v/esp32c3/esp32c3-devkit-rust-1/scripts/esp32c3_rom.ld
+++ b/boards/risc-v/esp32c3/esp32c3-devkit-rust-1/scripts/esp32c3_rom.ld
@@ -2027,6 +2027,7 @@ __umoddi3 = 0x400008bc;
 __umodsi3 = 0x400008c0;
 __unorddf2 = 0x400008c4;
 __unordsf2 = 0x400008c8;
+syscall_table_ptr = 0x3fcdffe0;
 
 /***************************************
  Redefine functions
diff --git a/boards/risc-v/esp32c3/esp32c3-devkit/scripts/Make.defs b/boards/risc-v/esp32c3/esp32c3-devkit/scripts/Make.defs
index dd7da72241d..77d0896231a 100644
--- a/boards/risc-v/esp32c3/esp32c3-devkit/scripts/Make.defs
+++ b/boards/risc-v/esp32c3/esp32c3-devkit/scripts/Make.defs
@@ -39,7 +39,7 @@ ARCHSCRIPT += $(BOARD_DIR)$(DELIM)scripts$(DELIM)esp32c3_rom.ld
 
 ARCHPICFLAGS = -fpic
 
-CFLAGS := $(ARCHCFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+CFLAGS := $(ARCHCFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe -Werror=return-type -Werror
 CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
 CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
 CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
diff --git a/boards/risc-v/esp32c3/esp32c3-devkit/scripts/esp32c3_rom.ld b/boards/risc-v/esp32c3/esp32c3-devkit/scripts/esp32c3_rom.ld
index 8a0aee43bcd..d4a3152dd21 100644
--- a/boards/risc-v/esp32c3/esp32c3-devkit/scripts/esp32c3_rom.ld
+++ b/boards/risc-v/esp32c3/esp32c3-devkit/scripts/esp32c3_rom.ld
@@ -2027,6 +2027,7 @@ __umoddi3 = 0x400008bc;
 __umodsi3 = 0x400008c0;
 __unorddf2 = 0x400008c4;
 __unordsf2 = 0x400008c8;
+syscall_table_ptr = 0x3fcdffe0;
 
 /***************************************
  Redefine functions