diff --git a/assets/disk.fat b/assets/disk.fat
deleted file mode 100644
index 87cbc52..0000000
Binary files a/assets/disk.fat and /dev/null differ
diff --git a/assets/disk.img b/assets/diskbase.img
similarity index 99%
rename from assets/disk.img
rename to assets/diskbase.img
index 9aaf559..5d8f1ba 100644
Binary files a/assets/disk.img and b/assets/diskbase.img differ
diff --git a/assets/initrd.toml b/assets/initrd.toml
index 04a8847..876430b 100644
--- a/assets/initrd.toml
+++ b/assets/initrd.toml
@@ -10,14 +10,14 @@
 
 [[files]]
 dest = "screenfont.psf"
-source = "assets/fonts/tamsyn8x16r.psf"
+source = "../assets/fonts/tamsyn8x16r.psf"
 
 [[files]]
 dest = "nulldrv1"
-source = "build/kernel/src/drivers/nulldrv/nulldrv"
+source = "host/nulldrv"
 executable = true
 
 [[files]]
 dest = "nulldrv2"
-source = "build/kernel/src/drivers/nulldrv/nulldrv"
+source = "host/nulldrv"
 executable = true
diff --git a/generate_build.py b/generate_build.py
index f0e1778..4db01b9 100755
--- a/generate_build.py
+++ b/generate_build.py
@@ -13,6 +13,9 @@ MODULES = {
     "kutil":     library('src/libraries/kutil', []),
 
     "makerd":    program('src/tools/makerd', ["initrd", "kutil"], "makerd", ["native"]),
+
+    "nulldrv":   program('src/drivers/nulldrv', [], "nulldrv", ["host"]),
+
     "boot":      program('src/boot', ["elf"], "boot.elf", ["host"]),
     "kernel":    program('src/kernel', ["elf", "initrd", "kutil"], "popcorn.elf", ["host"]),
 }
@@ -26,9 +29,9 @@ def get_template(env, typename, name):
         return env.get_template("{}.default.ninja.j2".format(typename))
 
 
-def get_sources(path):
+def get_sources(path, srcroot):
     import os
-    from os.path import abspath, join, splitext
+    from os.path import abspath, join, relpath, splitext
 
     actions = {'.c': 'cc', '.cpp': 'cxx', '.s': 'nasm'}
 
@@ -40,7 +43,7 @@ def get_sources(path):
             name = join(root, f)
             sources.append(
                 source(
-                    name,
+                    relpath(name, srcroot),
                     abspath(name),
                     f + ".o",
                     actions[ext]))
@@ -68,8 +71,12 @@ def main(buildroot):
     import os
     from os.path import abspath, dirname, isdir, join
 
-    buildroot = abspath(buildroot)
-    srcroot = dirname(abspath(__file__))
+    generator = abspath(__file__)
+    srcroot = dirname(generator)
+
+    if buildroot is None:
+        buildroot = join(srcroot, "build")
+
     if not isdir(buildroot):
         os.mkdir(buildroot)
 
@@ -96,7 +103,7 @@ def main(buildroot):
                     open_list.extend(dep.deps)
                     targets[target].add(depname)
 
-        sources = get_sources(join(srcroot, mod.path))
+        sources = get_sources(join(srcroot, mod.path), join(srcroot, "src"))
         buildfile = join(buildroot, name + ".ninja")
         buildfiles.append(buildfile)
         with open(buildfile, 'w') as out:
@@ -141,12 +148,12 @@ def main(buildroot):
             buildfile=buildfile,
             buildfiles=buildfiles,
             templates=[abspath(f) for f in templates],
-            generator=abspath(__file__),
+            generator=generator,
             version=git_version))
 
 if __name__ == "__main__":
     import sys
-    buildroot = "build"
+    buildroot = None
     if len(sys.argv) > 1:
         buildroot = sys.argv[1]
     main(buildroot)
diff --git a/scripts/templates/build.ninja.j2 b/scripts/templates/build.ninja.j2
index 56a9c58..5ecede4 100644
--- a/scripts/templates/build.ninja.j2
+++ b/scripts/templates/build.ninja.j2
@@ -2,6 +2,29 @@ ninja_required_version = 1.3
 builddir = {{ buildroot }}
 srcroot = {{ srcroot }}
 
+warnflags = $
+    -Wformat=2 $
+    -Winit-self $
+    -Wfloat-equal $
+    -Winline $
+    -Wmissing-format-attribute $
+    -Wmissing-include-dirs $
+    -Wswitch $
+    -Wundef $
+    -Wdisabled-optimization $
+    -Wpointer-arith $
+    -Wno-attributes $
+    -Wno-sign-compare $
+    -Wno-multichar $
+    -Wno-div-by-zero $
+    -Wno-endif-labels $
+    -Wno-pragmas $
+    -Wno-format-extra-args $
+    -Wno-unused-result $
+    -Wno-deprecated-declarations $
+    -Wno-unused-function $
+    -Werror
+
 ccflags = $
     -I${srcroot}/src/include $
     -I${srcroot}/src/include/x86_64 $
@@ -9,7 +32,8 @@ ccflags = $
     -DVERSION_MINOR={{ version.minor }} $
     -DVERSION_PATCH={{ version.patch }} $
     -DVERSION_GITSHA=\"{{ version.sha }}\" $
-    -DGIT_VERSION=\"{{ version.major }}.{{ version.minor }}.{{ version.patch }}-{{ version.sha }}\"
+    -DGIT_VERSION=\"{{ version.major }}.{{ version.minor }}.{{ version.patch }}-{{ version.sha }}\" $
+    $warnflags
 
 asflags = $
     -DVERSION_MAJOR={{ version.major }} $
@@ -50,7 +74,35 @@ rule lib
 rule regen
     generator = true
     description = Regenrating build files
-    command = {{ generator }} ${builddir}
+    command = {{ generator }} $builddir
+
+rule cp
+    description = Copying $name
+    command = cp $in $out
+
+rule makerd
+    description = Making init ramdisk
+    command = $builddir/native/makerd $in $out
+
+rule makeefi
+    description = Converting $name
+    command = objcopy $
+        -j .text $
+        -j .sdata $
+        -j .data $
+        -j .dynamic $
+        -j .dynsym $
+        -j .rel $
+        -j .rela $
+        -j .reloc $
+        --target=efi-app-x86_64 $
+        $in $out
+
+rule makefat
+    description = Creating $name
+    command = $
+        cp $srcroot/assets/diskbase.img $out; $
+        mcopy -s -D o -i $out@@1024K $builddir/fatroot/* ::/
 
 {% for target in targets %}
 subninja {{ target }}/target.ninja
@@ -66,5 +118,27 @@ build $
     {%- endfor %}
     {{ generator }}
 
+build $builddir/flash.img : cp $srcroot/assets/ovmf/x64/OVMF.fd
+    name = flash.img
+
+build $builddir/popcorn.fat : cp $srcroot/assets/ovmf/x64/OVMF.fd
+    name = flash.img
+
+build $builddir/fatroot/popcorn.elf : cp $builddir/host/popcorn.elf
+    name = kernel to FAT image
+
+build $builddir/fatroot/efi/boot/bootx64.efi : cp $builddir/host/boot.efi
+    name = bootloader to FAT image
+
+build $builddir/fatroot/initrd.img : makerd ${srcroot}/assets/initrd.toml | $
+    ${builddir}/native/makerd $
+    ${builddir}/host/nulldrv
+
+build $builddir/popcorn.img : makefat | $
+    $builddir/fatroot/initrd.img $
+    $builddir/fatroot/popcorn.elf $
+    $builddir/fatroot/efi/boot/bootx64.efi
+    name = popcorn.img
+
 # vim: et ts=4 sts=4 sw=4
 
diff --git a/scripts/templates/module.base.ninja.j2 b/scripts/templates/module.base.ninja.j2
index 323f727..9304a27 100644
--- a/scripts/templates/module.base.ninja.j2
+++ b/scripts/templates/module.base.ninja.j2
@@ -22,5 +22,8 @@ build {% block artifact %} ${builddir}/lib{{ name }}.a : lib {% endblock %} $
 {%- if module.deps %}| {% for dep in module.deps %} ${builddir}/lib{{ dep }}.a {% endfor %}{% endif %}
     name = {{ name }}
 
-# End
+{% block extra %}
+{% endblock %}
+
+# vim: ft=ninja et ts=4 sts=4 sw=4
 
diff --git a/scripts/templates/program.boot.ninja.j2 b/scripts/templates/program.boot.ninja.j2
index f731a5c..a6bf7f9 100644
--- a/scripts/templates/program.boot.ninja.j2
+++ b/scripts/templates/program.boot.ninja.j2
@@ -3,16 +3,23 @@
 {{ super() }}
 
 cflags = $cflags $
-	-DKERNEL_FILENAME=L\"popcorn.elf\" $
-	-DGNU_EFI_USE_MS_ABI $
-	-DHAVE_USE_MS_ABI $
-	-DEFI_DEBUG=0 $
-	-DEFI_DEBUG_CLEAR_MEMORY=0 $
-	-fPIC $
-	-fshort-wchar
+    -DKERNEL_FILENAME=L\"popcorn.elf\" $
+    -DGNU_EFI_USE_MS_ABI $
+    -DHAVE_USE_MS_ABI $
+    -DEFI_DEBUG=0 $
+    -DEFI_DEBUG_CLEAR_MEMORY=0 $
+    -fPIC $
+    -fshort-wchar
 
 ldflags = $ldflags $
-	-shared $
-	-T ${srcroot}/src/arch/x86_64/boot.ld
+    -shared $
+    -T ${srcroot}/src/arch/x86_64/boot.ld
+
+{% endblock %}
+
+{% block extra %}
+
+build $builddir/boot.efi : makeefi ${builddir}/{{ module.output }}
+    name = boot.efi
 
 {% endblock %}
diff --git a/scripts/templates/program.default.ninja.j2 b/scripts/templates/program.default.ninja.j2
index ee7b698..4d25973 100644
--- a/scripts/templates/program.default.ninja.j2
+++ b/scripts/templates/program.default.ninja.j2
@@ -3,11 +3,11 @@
 {{ super() }}
 
 libs = $
-	-L${builddir} $
+    -L${builddir} $
     {%- for dep in module.deps %}
     -l{{dep}} $
     {%- endfor %}
-	$libs
+    $libs
 
 {% endblock %}
-{% block artifact %}{{ module.output }} : exe{% endblock %}
+{% block artifact %}${builddir}/{{ module.output }} : exe{% endblock %}
diff --git a/scripts/templates/program.kernel.ninja.j2 b/scripts/templates/program.kernel.ninja.j2
index deae3c7..38a0a3d 100644
--- a/scripts/templates/program.kernel.ninja.j2
+++ b/scripts/templates/program.kernel.ninja.j2
@@ -4,5 +4,6 @@
 
 asflags = $asflags -I${srcroot}/src/kernel/
 libs = $libs -lc
+ldflags = $ldflags -T ${srcroot}/src/arch/x86_64/kernel.ld
 
 {% endblock %}
diff --git a/scripts/templates/target.default.ninja.j2 b/scripts/templates/target.default.ninja.j2
index e57f874..b18ec94 100644
--- a/scripts/templates/target.default.ninja.j2
+++ b/scripts/templates/target.default.ninja.j2
@@ -9,6 +9,7 @@ cxx = clang++
 ld = clang++
 ar = ar
 nasm = nasm
+objcopy = objcopy
 {% endblock %}
 
 {% for module in modules %}
diff --git a/scripts/templates/target.host.ninja.j2 b/scripts/templates/target.host.ninja.j2
index 60bcb9f..527a73d 100644
--- a/scripts/templates/target.host.ninja.j2
+++ b/scripts/templates/target.host.ninja.j2
@@ -5,12 +5,14 @@ cxx = ${srcroot}/sysroot/bin/clang++
 ld = ${srcroot}/sysroot/bin/x86_64-elf-ld
 ar = ${srcroot}/sysroot/bin/x86_64-elf-ar
 nasm = ${srcroot}/sysroot/bin/nasm
+objcopy = ${srcroot}/sysroot/bin/x86_64-elf-objcopy
 {% endblock %}
 
 {% block variables %}
 
 ccflags = $ccflags $
     -D__ELF__ $
+    -D__POPCORN__ $
     -nodefaultlibs $
     -nostdinc $
     -nostdlib $