diff --git a/classes/mrw-rev.bbclass b/classes/mrw-rev.bbclass
new file mode 100644
index 0000000..2998314
--- /dev/null
+++ b/classes/mrw-rev.bbclass
@@ -0,0 +1,5 @@
+MRW_API_SRC_URI ?= "git://github.com/open-power/serverwiz.git;subpath=scripts"
+MRW_API_SRCREV ?= "04f15f37e9ab6c09412a0abcffb87e9aefcc5368"
+
+MRW_PATCH_SRC_URI ?= "git://github.com/openbmc/phosphor-mrw-tools"
+MRW_PATCH_SRCREV ?= "7a68567af7bf121143ef135152a39723518b6e06"