diff --git a/org/open_power/Host/Access.errors.yaml b/org/open_power/Host/Access.errors.yaml
new file mode 100644
index 0000000..08d6f4b
--- /dev/null
+++ b/org/open_power/Host/Access.errors.yaml
@@ -0,0 +1,5 @@
+- name: WriteCFAM
+  description: Failed to do a CFAM register write
+
+- name: ReadCFAM
+  description: Failed to do a CFAM register read