diff --git a/docs/reference/mpyfiles.rst b/docs/reference/mpyfiles.rst
index be0114701a..cd4db623ff 100644
--- a/docs/reference/mpyfiles.rst
+++ b/docs/reference/mpyfiles.rst
@@ -58,7 +58,7 @@ If importing an .mpy file fails then try the following:
     sys_mpy = sys.implementation._mpy
     arch = [None, 'x86', 'x64',
         'armv6', 'armv6m', 'armv7m', 'armv7em', 'armv7emsp', 'armv7emdp',
-        'xtensa', 'xtensawin', 'rv32imc'][sys_mpy >> 10]
+        'xtensa', 'xtensawin', 'rv32imc', 'rv64imc'][sys_mpy >> 10]
     print('mpy version:', sys_mpy & 0xff)
     print('mpy sub-version:', sys_mpy >> 8 & 3)
     print('mpy flags:', end='')
diff --git a/mpy-cross/main.c b/mpy-cross/main.c
index b7771ce6e7..63a74d0844 100644
--- a/mpy-cross/main.c
+++ b/mpy-cross/main.c
@@ -130,7 +130,8 @@ static int usage(char **argv) {
         "Target specific options:\n"
         "-msmall-int-bits=number : set the maximum bits used to encode a small-int\n"
         "-march=<arch> : set architecture for native emitter;\n"
-        "                x86, x64, armv6, armv6m, armv7m, armv7em, armv7emsp, armv7emdp, xtensa, xtensawin, rv32imc, host, debug\n"
+        "                x86, x64, armv6, armv6m, armv7m, armv7em, armv7emsp,\n"
+        "                armv7emdp, xtensa, xtensawin, rv32imc, rv64imc, host, debug\n"
         "\n"
         "Implementation specific options:\n", argv[0]
         );
@@ -316,6 +317,9 @@ MP_NOINLINE int main_(int argc, char **argv) {
                 } else if (strcmp(arch, "rv32imc") == 0) {
                     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_RV32IMC;
                     mp_dynamic_compiler.nlr_buf_num_regs = MICROPY_NLR_NUM_REGS_RV32I;
+                } else if (strcmp(arch, "rv64imc") == 0) {
+                    mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_RV64IMC;
+                    mp_dynamic_compiler.nlr_buf_num_regs = MICROPY_NLR_NUM_REGS_RV64I;
                 } else if (strcmp(arch, "debug") == 0) {
                     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_DEBUG;
                     mp_dynamic_compiler.nlr_buf_num_regs = 0;
@@ -329,6 +333,9 @@ MP_NOINLINE int main_(int argc, char **argv) {
                     #elif defined(__arm__) && !defined(__thumb2__)
                     mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_ARMV6;
                     mp_dynamic_compiler.nlr_buf_num_regs = MICROPY_NLR_NUM_REGS_ARM_THUMB_FP;
+                    #elif defined(__riscv) && (__riscv_xlen == 64)
+                    mp_dynamic_compiler.native_arch = MP_NATIVE_ARCH_RV64IMC;
+                    mp_dynamic_compiler.nlr_buf_num_regs = MICROPY_NLR_NUM_REGS_RV64I;
                     #else
                     mp_printf(&mp_stderr_print, "unable to determine host architecture for -march=host\n");
                     exit(1);
diff --git a/mpy-cross/mpy_cross/__init__.py b/mpy-cross/mpy_cross/__init__.py
index 9399aa92f3..6d7002a3b8 100644
--- a/mpy-cross/mpy_cross/__init__.py
+++ b/mpy-cross/mpy_cross/__init__.py
@@ -43,6 +43,7 @@ NATIVE_ARCHS = {
     "NATIVE_ARCH_XTENSA": "xtensa",
     "NATIVE_ARCH_XTENSAWIN": "xtensawin",
     "NATIVE_ARCH_RV32IMC": "rv32imc",
+    "NATIVE_ARCH_RV64IMC": "rv64imc",
 }
 
 globals().update(NATIVE_ARCHS)
diff --git a/py/persistentcode.h b/py/persistentcode.h
index cf257a7ab1..a45d5fd182 100644
--- a/py/persistentcode.h
+++ b/py/persistentcode.h
@@ -98,6 +98,7 @@ enum {
     MP_NATIVE_ARCH_XTENSA,
     MP_NATIVE_ARCH_XTENSAWIN,
     MP_NATIVE_ARCH_RV32IMC,
+    MP_NATIVE_ARCH_RV64IMC,
     MP_NATIVE_ARCH_DEBUG, // this entry should always be last
 };
 
diff --git a/tests/feature_check/target_info.py b/tests/feature_check/target_info.py
index 5367eb6a47..35a995a153 100644
--- a/tests/feature_check/target_info.py
+++ b/tests/feature_check/target_info.py
@@ -19,6 +19,7 @@ arch = [
     "xtensa",
     "xtensawin",
     "rv32imc",
+    "rv64imc",
 ][sys_mpy >> 10]
 build = getattr(sys.implementation, "_build", "unknown")
 thread = getattr(sys.implementation, "_thread", None)
diff --git a/tools/mpy-tool.py b/tools/mpy-tool.py
index c87c656ff9..df918e1539 100755
--- a/tools/mpy-tool.py
+++ b/tools/mpy-tool.py
@@ -94,6 +94,7 @@ MP_NATIVE_ARCH_ARMV7EMDP = 8
 MP_NATIVE_ARCH_XTENSA = 9
 MP_NATIVE_ARCH_XTENSAWIN = 10
 MP_NATIVE_ARCH_RV32IMC = 11
+MP_NATIVE_ARCH_RV64IMC = 12
 
 MP_PERSISTENT_OBJ_FUN_TABLE = 0
 MP_PERSISTENT_OBJ_NONE = 1
@@ -1061,6 +1062,7 @@ class RawCodeNative(RawCode):
             MP_NATIVE_ARCH_XTENSA,
             MP_NATIVE_ARCH_XTENSAWIN,
             MP_NATIVE_ARCH_RV32IMC,
+            MP_NATIVE_ARCH_RV64IMC,
         ):
             self.fun_data_attributes = '__attribute__((section(".text,\\"ax\\",@progbits # ")))'
         else:
@@ -1078,8 +1080,8 @@ class RawCodeNative(RawCode):
             self.fun_data_attributes += " __attribute__ ((aligned (4)))"
         elif (
             MP_NATIVE_ARCH_ARMV6M <= config.native_arch <= MP_NATIVE_ARCH_ARMV7EMDP
-        ) or config.native_arch == MP_NATIVE_ARCH_RV32IMC:
-            # ARMVxxM or RV32IMC -- two byte align.
+        ) or MP_NATIVE_ARCH_RV32IMC <= config.native_arch <= MP_NATIVE_ARCH_RV64IMC:
+            # ARMVxxM or RV{32,64}IMC -- two byte align.
             self.fun_data_attributes += " __attribute__ ((aligned (2)))"
 
     def disassemble(self):