diff --git a/arch/arm/mach-rockchip/rk3288-board.c b/arch/arm/mach-rockchip/rk3288-board.c
index 0365793..73cd668 100644
--- a/arch/arm/mach-rockchip/rk3288-board.c
+++ b/arch/arm/mach-rockchip/rk3288-board.c
@@ -307,10 +307,10 @@
 	""
 );
 
-#define GRF_SOC_CON2 0xff77024c
-
 int board_early_init_f(void)
 {
+	const uintptr_t GRF_SOC_CON0 = 0xff770244;
+	const uintptr_t GRF_SOC_CON2 = 0xff77024c;
 	struct udevice *pinctrl;
 	struct udevice *dev;
 	int ret;
@@ -339,5 +339,11 @@
 	}
 	rk_setreg(GRF_SOC_CON2, 1 << 0);
 
+	/*
+	 * Disable JTAG on sdmmc0 IO. The SDMMC won't work until this bit is
+	 * cleared
+	 */
+	rk_clrreg(GRF_SOC_CON0, 1 << 12);
+
 	return 0;
 }