diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..214adf0
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,12 @@
+BasedOnStyle: Google
+IndentWidth: 4
+AlignConsecutiveMacros: Consecutive
+AlignConsecutiveDeclarations: Consecutive
+AlignConsecutiveAssignments: Consecutive
+AllowShortFunctionsOnASingleLine: None
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterEnum: false
+  AfterStruct: false
+  SplitEmptyFunction: false
+ColumnLimit: 120
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9642657..9ff6cf5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,6 +10,7 @@ endif()
 
 add_custom_command(
     OUTPUT
+        "mruby/${MRUBY_MCUX_TARGET}/lib/libmruby.a__" # FIXME: Force the target run every time...
         "mruby/${MRUBY_MCUX_TARGET}/lib/libmruby.a"
 
     COMMAND
@@ -23,7 +24,9 @@ add_custom_command(
 )
 
 add_custom_target(mruby_libs
-    DEPENDS "mruby/${MRUBY_MCUX_TARGET}/lib/libmruby.a"
+    DEPENDS
+        "mruby/${MRUBY_MCUX_TARGET}/lib/libmruby.a__" # FIXME: Force the target run every time...
+        "mruby/${MRUBY_MCUX_TARGET}/lib/libmruby.a"
 )
 
 set_target_properties(mruby_libs PROPERTIES
diff --git a/configs/lpc55s69.rb b/configs/lpc55s69.rb
index 0393f0e..07f163e 100644
--- a/configs/lpc55s69.rb
+++ b/configs/lpc55s69.rb
@@ -50,6 +50,8 @@ MRuby::CrossBuild.new("lpc55s69") do |conf|
   conf.gem :core => "mruby-enum-ext"
   conf.gem :core => "mruby-numeric-ext"
 
+  conf.gembox "../../mrbgems/utilities"
+
   #light-weight regular expression
   #conf.gem :github => "masamitsu-murase/mruby-hs-regexp", :branch => "master"
 
diff --git a/mrbgems/mruby-devmem/mrbgem.rake b/mrbgems/mruby-devmem/mrbgem.rake
new file mode 100644
index 0000000..ec10af7
--- /dev/null
+++ b/mrbgems/mruby-devmem/mrbgem.rake
@@ -0,0 +1,5 @@
+MRuby::Gem::Specification.new('mruby-devmem') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'imi415'
+  spec.summary = 'Address space R/W access'
+end
\ No newline at end of file
diff --git a/mrbgems/mruby-devmem/src/devmem.c b/mrbgems/mruby-devmem/src/devmem.c
new file mode 100644
index 0000000..a9dc3e0
--- /dev/null
+++ b/mrbgems/mruby-devmem/src/devmem.c
@@ -0,0 +1,96 @@
+#include <mruby.h>
+
+static mrb_value mrb_read32(mrb_state *mrb, mrb_value self) {
+    mrb_value addr     = mrb_get_arg1(mrb);
+    uint32_t  addr_int = mrb_integer(addr);
+
+    if (addr_int % 4 != 0) {
+        mrb_raise(mrb, E_ARGUMENT_ERROR, "Address must be 32bits aligned");
+    }
+
+    uint32_t val = *(volatile uint32_t *)(addr_int);
+
+    return mrb_int_value(mrb, val);
+}
+
+static mrb_value mrb_read16(mrb_state *mrb, mrb_value self) {
+    mrb_value addr     = mrb_get_arg1(mrb);
+    uint32_t  addr_int = mrb_integer(addr);
+
+    if (addr_int % 2 != 0) {
+        mrb_raise(mrb, E_ARGUMENT_ERROR, "Address must be 16bits aligned");
+    }
+
+    uint16_t val = *(volatile uint16_t *)(addr_int);
+
+    return mrb_int_value(mrb, val);
+}
+
+static mrb_value mrb_read8(mrb_state *mrb, mrb_value self) {
+    mrb_value addr     = mrb_get_arg1(mrb);
+    uint32_t  addr_int = mrb_integer(addr);
+
+    uint8_t val = *(volatile uint8_t *)(addr_int);
+
+    return mrb_int_value(mrb, val);
+}
+
+static mrb_value mrb_write32(mrb_state *mrb, mrb_value self) {
+    mrb_value addr, value;
+    mrb_get_args(mrb, "i|i", &addr, &value);
+
+    uint32_t addr_int  = mrb_integer(addr);
+    uint32_t value_int = mrb_integer(value);
+
+    if (addr_int % 4 != 0) {
+        mrb_raise(mrb, E_ARGUMENT_ERROR, "Address must be 32bits aligned");
+    }
+
+    *(volatile uint16_t *)(addr_int) = value_int;
+
+    return self;
+}
+
+static mrb_value mrb_write16(mrb_state *mrb, mrb_value self) {
+    mrb_value addr, value;
+    mrb_get_args(mrb, "i|i", &addr, &value);
+
+    uint32_t addr_int  = mrb_integer(addr);
+    uint16_t value_int = mrb_integer(value);
+
+    if (addr_int % 2 != 0) {
+        mrb_raise(mrb, E_ARGUMENT_ERROR, "Address must be 16bits aligned");
+    }
+
+    *(volatile uint16_t *)(addr_int) = value_int;
+
+    return self;
+}
+
+static mrb_value mrb_write8(mrb_state *mrb, mrb_value self) {
+    mrb_value addr, value;
+    mrb_get_args(mrb, "i|i", &addr, &value);
+
+    uint32_t addr_int  = mrb_integer(addr);
+    uint16_t value_int = mrb_integer(value);
+
+    *(volatile uint8_t *)(addr_int) = value_int;
+
+    return self;
+}
+
+void mrb_mruby_devmem_gem_init(mrb_state *mrb) {
+    struct RClass *class_peekpoke = mrb_define_module(mrb, "Machine");
+
+    mrb_define_class_method(mrb, class_peekpoke, "read32", mrb_read32, MRB_ARGS_ARG(1, 0));
+    mrb_define_class_method(mrb, class_peekpoke, "read16", mrb_read16, MRB_ARGS_ARG(1, 0));
+    mrb_define_class_method(mrb, class_peekpoke, "read8", mrb_read8, MRB_ARGS_ARG(1, 0));
+
+    mrb_define_class_method(mrb, class_peekpoke, "write32", mrb_write32, MRB_ARGS_ARG(2, 0));
+    mrb_define_class_method(mrb, class_peekpoke, "write16", mrb_write16, MRB_ARGS_ARG(2, 0));
+    mrb_define_class_method(mrb, class_peekpoke, "write8", mrb_write8, MRB_ARGS_ARG(2, 0));
+}
+
+void mrb_mruby_devmem_gem_final(mrb_state *mrb) {
+    /* Not used */
+}
\ No newline at end of file
diff --git a/mrbgems/utilities.gembox b/mrbgems/utilities.gembox
new file mode 100644
index 0000000..ac3415e
--- /dev/null
+++ b/mrbgems/utilities.gembox
@@ -0,0 +1,3 @@
+MRuby::GemBox.new do |conf|
+    conf.gem :core => "../../mrbgems/mruby-devmem"
+end
\ No newline at end of file