diff --git a/.gitmodules b/.gitmodules
index 2c4a3d518..e93978d2a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -20,3 +20,6 @@
 [submodule "3rd/googletest"]
 	path = 3rd/googletest
 	url = https://github.com/google/googletest.git
+[submodule "3rd/grub2"]
+	path = 3rd/grub2
+	url = https://git.savannah.gnu.org/git/grub.git
diff --git a/3rd/grub2 b/3rd/grub2
new file mode 160000
index 000000000..6811f6f09
--- /dev/null
+++ b/3rd/grub2
@@ -0,0 +1 @@
+Subproject commit 6811f6f09d61996a3acbc4fc0414e45964f0e2d9
diff --git a/cmake/3rd.cmake b/cmake/3rd.cmake
index 9cfcbbe79..0077f8dc5 100644
--- a/cmake/3rd.cmake
+++ b/cmake/3rd.cmake
@@ -58,6 +58,12 @@ if (NOT TARGET gtest)
     include(GoogleTest)
 endif ()
 
+# https://git.savannah.gnu.org/git/grub.git
+set(grub2_SOURCE_DIR ${CMAKE_SOURCE_DIR}/3rd/grub2)
+target_include_directories(grub2 INTERFACE
+        ${grub2_SOURCE_DIR}/include
+)
+
 # https://github.com/gdbinit/Gdbinit.git
 set(gdbinit_SOURCE_DIR ${CMAKE_SOURCE_DIR}/3rd/gdbinit)
 set(gdbinit_BINARY_DIR ${CMAKE_BINARY_DIR}/3rd/gdbinit)