diff --git a/.drone.yml b/.drone.yml
index 511ed17..9781275 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -15,17 +15,54 @@ steps:
   environment:
     DEBIAN_FRONTEND: noninteractive
   commands:
-  - apt-get update
-  - apt-get install -y sed make binutils build-essential diffutils gcc g++ bash patch gzip bzip2 perl tar cpio unzip rsync file bc findutils wget
+    - apt-get update
+    - apt-get install -y sed make binutils build-essential diffutils gcc g++ bash patch gzip bzip2 perl tar cpio unzip rsync file bc findutils wget
+
+- name: patch defconfig
+  environment:
+    CONFIG_NAME: "rpi2_defconfig"
+  commands:
+  - .drone/patch_defconfig.sh
 
 - name: configure
   commands:
     - ./buildroot_make.sh rpi2_defconfig
 
+- name: restore cache
+  image: plugins/s3-cache
+  settings:
+    pull: true
+    endpoint: https://s3.ap-northeast-1.wasabisys.com
+    access_key:
+      from_secret: cache_ak
+    secret_key:
+      from_secret: cache_aks
+    restore: true
+    filename: "cache_rpi2"
+    mount:
+      - ./dl
+      - ./ccache
+
 - name: build
   commands:
     - ./buildroot_make.sh -j4
 
+- name: save cache
+  image: plugins/s3-cache
+  settings:
+    pull: true
+    endpoint: https://s3.ap-northeast-1.wasabisys.com
+    access_key:
+      from_secret: cache_ak
+    secret_key:
+      from_secret: cache_aks
+    rebuild: true
+    flush: true
+    filename: "cache_rpi2"
+    mount:
+      - ./dl
+      - ./ccache
+
 ---
 kind: pipeline
 type: vm
@@ -46,10 +83,47 @@ steps:
   - apt-get update
   - apt-get install -y sed make binutils build-essential diffutils gcc g++ bash patch gzip bzip2 perl tar cpio unzip rsync file bc findutils wget
 
+- name: patch defconfig
+  environment:
+    CONFIG_NAME: "tlt113_minievm_defconfig"
+  commands:
+  - .drone/patch_defconfig.sh
+
 - name: configure
   commands:
     - ./buildroot_make.sh tlt113_minievm_defconfig
 
+- name: restore cache
+  image: plugins/s3-cache
+  settings:
+    pull: true
+    endpoint: https://s3.ap-northeast-1.wasabisys.com/imi415-ci-artifacts
+    access_key:
+      from_secret: cache_ak
+    secret_key:
+      from_secret: cache_aks
+    restore: true
+    filename: "cache_rpi2"
+    mount:
+      - ./dl
+      - ./ccache
+
 - name: build
   commands:
     - ./buildroot_make.sh -j4
+
+- name: save cache
+  image: plugins/s3-cache
+  settings:
+    pull: true
+    endpoint: https://s3.ap-northeast-1.wasabisys.com/imi415-ci-artifacts
+    access_key:
+      from_secret: cache_ak
+    secret_key:
+      from_secret: cache_aks
+    rebuild: true
+    flush: true
+    filename: "cache_rpi2"
+    mount:
+      - ./dl
+      - ./ccache
diff --git a/.drone/patch_defconfig.sh b/.drone/patch_defconfig.sh
new file mode 100755
index 0000000..2f4f100
--- /dev/null
+++ b/.drone/patch_defconfig.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+SOURCE_PATH=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )/../" &> /dev/null && pwd )
+CONFIG_PATH=${SOURCE_PATH}/external_tree/configs/${CONFIG_NAME}
+
+echo "Patching config file: ${CONFIG_PATH}"
+
+if [ ! -f ${CONFIG_PATH} ]; then
+	echo "Config file not found"
+	exit -1
+fi
+
+CCACHE_PATH="${SOURCE_PATH}/ccache"
+DL_PATH="${SOURCE_PATH}/dl"
+
+cat - << CFG >> ${CONFIG_PATH}
+BR2_DL_DIR="${DL_PATH}"
+BR2_CCACHE=y
+BR2_CCACHE_DIR="${CCACHE_PATH}"
+BR2_CCACHE_INITIAL_SETUP="-M 50G"
+CFG
+