diff --git a/default.xml b/default.xml
index 3fc338f..c119e1d 100644
--- a/default.xml
+++ b/default.xml
@@ -4,7 +4,7 @@
   <remote  name="aosp"
            fetch=".."
            review="https://android-review.googlesource.com/" />
-  <default revision="master"
+  <default revision="refs/tags/android-o-mr1-preview-1"
            remote="aosp"
            sync-j="4" />
 
@@ -277,6 +277,7 @@
   <project path="external/parameter-framework" name="platform/external/parameter-framework" groups="pdk-fs,pdk-cw-fs" />
   <project path="external/pcre" name="platform/external/pcre" groups="pdk" />
   <project path="external/pdfium" name="platform/external/pdfium" groups="pdk" />
+  <project path="external/perfetto" name="platform/external/perfetto" groups="pdk" />
   <project path="external/piex" name="platform/external/piex" groups="pdk" />
   <project path="external/ppp" name="platform/external/ppp" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/proguard" name="platform/external/proguard" groups="pdk" />
@@ -548,6 +549,7 @@
   <project path="prebuilts/go/linux-x86" name="platform/prebuilts/go/linux-x86" groups="linux,tradefed" clone-depth="1" />
   <project path="prebuilts/gradle-plugin" name="platform/prebuilts/gradle-plugin" groups="pdk-cw-fs,pdk-fs" clone-depth="1" />
   <project path="prebuilts/jdk/jdk8" name="platform/prebuilts/jdk/jdk8" groups="pdk" clone-depth="1" />
+  <project path="prebuilts/jdk/jdk9" name="platform/prebuilts/jdk/jdk9" groups="pdk" clone-depth="1" />
   <project path="prebuilts/libs/libedit" name="platform/prebuilts/libs/libedit" groups="pdk-cw-fs,pdk-fs" clone-depth="1" />
   <project path="prebuilts/maven_repo/android" name="platform/prebuilts/maven_repo/android" groups="pdk-cw-fs,pdk-fs" clone-depth="1" />
   <project path="prebuilts/maven_repo/bumptech" name="platform/prebuilts/maven_repo/bumptech" groups="pdk-cw-fs,pdk-fs" clone-depth="1" />