diff --git a/sys/dev/axgbe/if_axgbe_pci.c b/sys/dev/axgbe/if_axgbe_pci.c
index a25ee88d600..feacfb78ecf 100644
--- a/sys/dev/axgbe/if_axgbe_pci.c
+++ b/sys/dev/axgbe/if_axgbe_pci.c
@@ -450,6 +450,10 @@ axgbe_if_attach_pre(if_ctx_t ctx)
 		&& pci_get_vendor(rdev) == 0x1022) {
 		pdata->xpcs_window_def_reg = PCS_V2_RV_WINDOW_DEF;
 		pdata->xpcs_window_sel_reg = PCS_V2_RV_WINDOW_SELECT;
+	} else if (rdev && (pci_get_device(rdev) == 0x14b5
+		&& pci_get_vendor(rdev) == 0x1022)) {
+		pdata->xpcs_window_def_reg = PCS_V2_YC_WINDOW_DEF;
+		pdata->xpcs_window_sel_reg = PCS_V2_YC_WINDOW_SELECT;
 	} else {
 		pdata->xpcs_window_def_reg = PCS_V2_WINDOW_DEF;
 		pdata->xpcs_window_sel_reg = PCS_V2_WINDOW_SELECT;
diff --git a/sys/dev/axgbe/xgbe-common.h b/sys/dev/axgbe/xgbe-common.h
index b24084ddc17..97c16895594 100644
--- a/sys/dev/axgbe/xgbe-common.h
+++ b/sys/dev/axgbe/xgbe-common.h
@@ -938,6 +938,8 @@
 #define	PCS_V2_WINDOW_SELECT		0x9064
 #define	PCS_V2_RV_WINDOW_DEF		0x1060
 #define	PCS_V2_RV_WINDOW_SELECT		0x1064
+#define	PCS_V2_YC_WINDOW_DEF		0x18060
+#define	PCS_V2_YC_WINDOW_SELECT		0x18064
 
 /* PCS register entry bit positions and sizes */
 #define PCS_V2_WINDOW_DEF_OFFSET_INDEX	6