+**NOTE:**
+To avoid useless download and rebuild, it's important to set the variable DL_DIR and SSTATE_DIR in your configuration.
+
+```sh
+echo '# reuse download directories' >> $AGL_TOP/site.conf
+echo 'DL_DIR = "$HOME/downloads/"' >> $AGL_TOP/site.conf
+echo 'SSTATE_DIR = "$AGL_TOP/sstate-cache/"' >> $AGL_TOP/site.conf
+ln -sf $AGL_TOP/site.conf conf/
+```
+
+**Reference Hardware :**
+