diff --git a/gnu/packages/embedded.scm b/gnu/packages/embedded.scm
index 215007dd31..701bf6bff8 100644
--- a/gnu/packages/embedded.scm
+++ b/gnu/packages/embedded.scm
@@ -12,6 +12,7 @@
 ;;; Copyright © 2021 Morgan Smith <Morgan.J.Smith@outlook.com>
 ;;; Copyright © 2022 Mathieu Othacehe <othacehe@gnu.org>
 ;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2023 Lu Hui <luhux76@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -49,6 +50,7 @@ (define-module (gnu packages embedded)
   #:use-module (gnu packages boost)
   #:use-module (gnu packages check)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages commencement)
   #:use-module (gnu packages cross-base)
   #:use-module (gnu packages dejagnu)
   #:use-module (gnu packages flex)
@@ -1745,3 +1747,187 @@ (define-public ts4900-utils
 @item tssilomon
 @end itemize")
       (license license:bsd-2))))
+
+(define-public riscv64-unknown-elf-binutils
+  (let ((xbinutils (cross-binutils "riscv64-unknown-elf")))
+    (package
+      (inherit xbinutils)
+      (name "riscv64-unknown-elf-binutils")
+      (arguments
+       `(,@(substitute-keyword-arguments (package-arguments xbinutils)
+             ((#:configure-flags flags)
+              `(cons "--enable-multilib" ,flags))))))))
+
+(define-public riscv64-unknown-elf-gcc
+  (let ((xgcc (cross-gcc "riscv64-unknown-elf"
+                         #:xbinutils riscv64-unknown-elf-binutils)))
+    (package
+      (inherit xgcc)
+      (name "riscv64-unknown-elf-gcc")
+      (arguments
+       (substitute-keyword-arguments (package-arguments xgcc)
+         ((#:phases phases)
+          #~(modify-phases #$phases
+              (add-after 'set-paths 'augment-CPLUS_INCLUDE_PATH
+                (lambda* (#:key inputs #:allow-other-keys)
+                  (let ((gcc (assoc-ref inputs  "gcc")))
+                    ;; Remove the default compiler from CPLUS_INCLUDE_PATH to
+                    ;; prevent header conflict with the GCC from native-inputs.
+                    (setenv "CPLUS_INCLUDE_PATH"
+                            (string-join
+                             (delete (string-append gcc "/include/c++")
+                                     (string-split (getenv
"CPLUS_INCLUDE_PATH")
+                                                   #\:))
+                             ":"))
+                    (format #t
+                            "environment variable
`CPLUS_INCLUDE_PATH' changed to ~a~%"
+                            (getenv "CPLUS_INCLUDE_PATH")))))
+              (add-after 'unpack 'fix-genmultilib
+                (lambda _
+                  (substitute* "gcc/genmultilib"
+                    (("#!/bin/sh") (string-append "#!" (which "sh"))))))))
+         ((#:configure-flags flags)
+          #~(append (list "--enable-multilib"
+                          "--with-newlib"
+                          "--with-host-libstdcxx=-static-libgcc
-Wl,-Bstatic,-lstdc++,-Bdynamic -lm"
+                          "--enable-plugins"
+                          "--disable-decimal-float"
+                          "--disable-libffi"
+                          "--disable-libgomp"
+                          "--disable-libmudflap"
+                          "--disable-libquadmath"
+                          "--disable-libssp"
+                          "--disable-libstdcxx-pch"
+                          "--disable-nls"
+                          "--disable-shared"
+                          "--disable-threads"
+                          "--disable-tls")
+                    (delete "--disable-multilib" #$flags)))))
+      (native-search-paths
+       (list (search-path-specification
+              (variable "CROSS_C_INCLUDE_PATH")
+              (files '("riscv64-unknown-elf/include")))
+             (search-path-specification
+              (variable "CROSS_CPLUS_INCLUDE_PATH")
+              (files '("riscv64-unknown-elf/include"
+                       "riscv64-unknown-elf/include/c++"
+                       "riscv64-unknown-elf/include/c++/riscv64-unknown-elf")))
+             (search-path-specification
+              (variable "CROSS_LIBRARY_PATH")
+              (files '("riscv64-unknown-elf/lib"))))))))
+
+(define-public riscv64-unknown-elf-newlib
+  (let ((commit "e301a74a6f111df4553b50b813a589589d1708b1")
+        (revision "0"))
+    (package
+      (inherit newlib-arm-none-eabi)
+      (name "riscv64-unknown-elf-newlib")
+      (version (git-version "0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "http://sourceware.org/git/newlib-cygwin.git")
+               (commit commit)))
+         (file-name (git-file-name "newlib" commit))
+         (sha256
+          (base32
+           "0ylibsavxqbwnl6yqxql3j2dzax843wahy93fncqlnmm3cfnz9i0"))))
+      (arguments
+       `(#:out-of-source? #t
+         #:configure-flags '("--target=riscv64-unknown-elf"
+                             "--enable-multilib"
+                             "--enable-newlib-io-long-long"
+                             "--enable-newlib-io-c99-formats"
+                             "--enable-newlib-register-fini"
+                             "--enable-newlib-retargetable-locking"
+                             "--disable-newlib-supplied-syscalls"
+                             "--disable-nls")))
+      (native-inputs
+       `(("xbinutils" ,(cross-binutils "riscv64-unknown-elf"))
+         ("xgcc" ,riscv64-unknown-elf-gcc)
+         ("texinfo" ,texinfo))))))
+
+(define-public riscv64-unknown-elf-newlib-nano
+  (package (inherit riscv64-unknown-elf-newlib)
+           (name "riscv64-unknown-elf-newlib-nano")
+           (arguments
+            `(#:out-of-source? #t
+              #:configure-flags
+              '("--target=riscv64-unknown-elf"
+                "--enable-multilib"
+                "--disable-newlib-supplied-syscalls"
+                "--enable-newlib-reent-small"
+                "--disable-newlib-fvwrite-in-streamio"
+                "--disable-newlib-fseek-optimization"
+                "--disable-newlib-wide-orient"
+                "--enable-newlib-nano-malloc"
+                "--disable-newlib-unbuf-stream-opt"
+                "--enable-lite-exit"
+                "--enable-newlib-global-atexit"
+                "--enable-newlib-nano-formatted-io"
+                "--disable-nls")
+              #:phases
+              (modify-phases %standard-phases
+                (delete 'strip)
+                (add-after 'install 'hardlink-newlib
+                  (lambda* (#:key outputs #:allow-other-keys)
+                    (let ((out (assoc-ref outputs "out")))
+                      ;; The nano.specs file says that newlib-nano
files should end
+                      ;; in "_nano.a" instead of just ".a".  Note
that this applies
+                      ;; to all the multilib folders too.
+                      (for-each
+                       (lambda (file)
+                         (link
+                          file
+                          (string-append
+                           ;; Strip ".a" off the end
+                           (substring file 0 (- (string-length file) 2))
+                           ;; Add "_nano.a" onto the end
+                           "_nano.a")))
+                       (find-files
+                        out
+
"^(libc.a|libm.a|libg.a|libgloss.a|libsemihost.a|libnosys.a|librdimon.a|libstdc\\+\\+.a|libsupc\\+\\+.a)$"))
+                      (mkdir-p (string-append out
"/riscv64-unknown-elf/include/newlib-nano"))
+                      (symlink
+                       "../newlib.h"
+                       (string-append out
"/riscv64-unknown-elf/include/newlib-nano/newlib.h"))
+                      #t))))))
+           (synopsis "Newlib variant for small systems with limited memory")))
+
+(define-public riscv64-unknown-elf-gdb
+  (package
+    (inherit gdb)
+    (name "riscv64-unknown-elf-gdb")
+    (arguments
+     `(#:configure-flags '("--target=riscv64-unknown-elf"
+                           "--enable-multilib"
+                           "--enable-interwork"
+                           "--enable-languages=c,c++"
+                           "--disable-nls")
+       ,@(package-arguments gdb)))))
+
+(define-public riscv64-unknown-elf-toolchain
+  (package
+    (name "riscv64-unknown-elf-toolchain")
+    (version (package-version riscv64-unknown-elf-gcc))
+    (source #f)
+    (build-system trivial-build-system)
+    (propagated-inputs
+     (list riscv64-unknown-elf-binutils riscv64-unknown-elf-gcc
+           riscv64-unknown-elf-newlib riscv64-unknown-elf-newlib-nano))
+    (arguments
+     '(#:modules ((guix build union))
+       #:builder
+       (begin
+         (use-modules (ice-9 match)
+                      (guix build union))
+         (match %build-inputs
+           (((names . directories) ...)
