diff --git a/board/sunxi/gmac.c b/board/sunxi/gmac.c
index e7ff952..f58c963 100644
--- a/board/sunxi/gmac.c
+++ b/board/sunxi/gmac.c
@@ -24,6 +24,15 @@ int sunxi_gmac_initialize(bd_t *bis)
 		CCM_GMAC_CTRL_GPIT_MII);
 #endif
 
+	/*
+	 * HdG: this is necessary to get GMAC to work reliable on the
+	 * Bananapi. We don't know what these undocumented bits do, so this
+	 * is a Bananapi specific hack for now.
+	 */
+#ifdef CONFIG_BANANAPI
+	setbits_le32(&ccm->gmac_clk_cfg, 0x3 << 10);
+#endif
+
 	/* Configure pin mux settings for GMAC */
 	for (pin = SUNXI_GPA(0); pin <= SUNXI_GPA(16); pin++) {
 #ifdef CONFIG_RGMII