Use out of (kernel) tree device tree (Palmetto)
diff --git a/meta-palmetto/recipes-kernel/linux/linux-obmc_%.bbappend b/meta-palmetto/recipes-kernel/linux/linux-obmc_%.bbappend
new file mode 100644
index 0000000..2c8056c
--- /dev/null
+++ b/meta-palmetto/recipes-kernel/linux/linux-obmc_%.bbappend
@@ -0,0 +1,2 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/linux-obmc:"
+SRC_URI += "file://palmetto.dts"