flash-ipmi: implement flashStartTransfer

Change-Id: I207f350dad3d73dacf1216e7742637531b50ea1a
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/configure.ac b/configure.ac
index 0fe7382..dd05a59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,6 +68,10 @@
     AC_SUBST([OESDK_TESTCASE_FLAGS], [$testcase_flags])
 )
 
+AC_ARG_VAR(STAGING_PATH, [The staging path for the flash image.])
+AS_IF([test "x$STAGING_PATH" == "x"], [STAGING_PATH="/run/initramfs/bmc-image"])
+AC_DEFINE_UNQUOTED([STAGING_PATH], ["$STAGING_PATH"], [The staging path for the flash image.])
+
 # Create configured output
 AC_CONFIG_FILES([Makefile test/Makefile])
 AC_OUTPUT