diff --git a/make_netboot.sh b/make_netboot.sh
index 324b0232f3..4bef5e83e3 100755
--- a/make_netboot.sh
+++ b/make_netboot.sh
@@ -28,6 +28,9 @@ DEFINE_string image "" "Path to the image to use"
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
+. "${SCRIPT_ROOT}/build_library/build_common.sh" || exit 1
+. "${BUILD_LIBRARY_DIR}/board_options.sh" || exit 1
+
 switch_to_strict_mode
 # build_packages artifact output.
 SYSROOT="${GCLIENT_ROOT}/chroot/build/${FLAGS_board}"
@@ -86,9 +89,50 @@ sudo mount -o loop part_3 r
 sudo mount -o loop part_1 s
 echo "Mount install shim rootfs (partition 3)"
 
+if [ "${ARCH}" = "arm" ]; then
+  export MKIMAGE_ARCH="arm"
+else
+  export MKIMAGE_ARCH="x86" # including amd64
+fi
+
 # Get netboot kernel.
-echo "Generating netboot kernel vmlinux.uimg"
-cp "r/boot/vmlinux.uimg" "netboot"
+if [ "${ARCH}" = "arm" ]; then
+  # Currently we don't use initramfs for ARM. Someday we would probably want
+  # initramfs for USB factory installation.
+  # TODO: Converge build processes of ARM and x86.
+  echo "Generating netboot kernel vmlinux.uimg"
+  cp "r/boot/vmlinux.uimg" "netboot"
+else
+  echo "Building kernel"
+
+  # Create temporary emerge root
+  temp_build_path="$(mktemp -d bk_XXXXXXXX)"
+  if ! [ -d "${temp_build_path}" ]; then
+    echo "Failed to create temporary directory."
+    exit 1
+  fi
+
+  # Emerge network boot kernel
+  # We don't want to build whole install shim everytime we run this script,
+  # and thus we only build kernel here. If this script is run against install
+  # shim with different kernel version, this might not work. But as we don't
+  # upgrade kernel so often, this is probably fine.
+  export USE='netboot'
+  export EMERGE_BOARD_CMD="emerge-${FLAGS_board}"
+  emerge_custom_kernel ${temp_build_path}
+
+  # Generate kernel uImage
+  echo "Generating netboot kernel vmlinux.uimg"
+
+  # U-boot put kernel image at 0x100000. We load it at 0x3000000 because
+  # 0x3000000 is safe enough not to overlap with image at 0x100000.
+  mkimage -A "${MKIMAGE_ARCH}" -O linux -T kernel -n "Linux kernel" -C none \
+      -d "${temp_build_path}"/boot/vmlinuz \
+      -a 0x03000000 -e 0x03000000 netboot/vmlinux.uimg
+
+  # Clean up temporary emerge root
+  sudo rm -rf "${temp_build_path}"
+fi
 
 echo "Add lsb-factory"
 # Copy factory config file.
@@ -108,7 +152,7 @@ echo "Generating netboot rootfs initrd.uimg"
 # U-boot's uimg wrapper specifies where we will load the blob into memory.
 # tftp boot's default root address is set to 0x12008000 in legacy_image.bin,
 # so we want to unpack it there.
-mkimage -A arm -O linux -T ramdisk -a 0x12008000 \
+mkimage -A "${MKIMAGE_ARCH}" -O linux -T ramdisk -a 0x12008000 \
     -n "Factory Install RootFS" -C gzip -d ext2_rootfs.gz \
     netboot/initrd.uimg