fix-sdcard-detect-bpi-m2z.patch

diff -Naur v2017.09/drivers/mmc/sunxi_mmc.c v2017.09-bpi-m2z/drivers/mmc/sunxi_mmc.c
--- v2017.09/drivers/mmc/sunxi_mmc.c	2017-09-19 08:15:12.948794321 +0800
+++ v2017.09-bpi-m2z/drivers/mmc/sunxi_mmc.c	2017-11-08 09:21:20.000000000 +0800
@@ -465,7 +465,12 @@
 	if (cd_pin < 0)
 		return 1;
 
+#ifdef BPI
 	return !gpio_get_value(cd_pin);
+#else
+	printf("BPI: skip sunxi_mmc_getcd pin %d(%d)\n",cd_pin, gpio_get_value(cd_pin));
+	return 1;
+#endif
 }
 
 static const struct mmc_ops sunxi_mmc_ops = {