mmc board code: add a weak common implementation

NXP common code now calls a board function mmc_map_to_kernel_blk().
Provide a weak function in common code for boards not requiring
special handling.
Taken from boards/freescale/common/mmc.c

Related-to: ELB-2351
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/board/toradex/common/mmc.c b/board/toradex/common/mmc.c
new file mode 100644
index 0000000000..5fe8026ed1
--- /dev/null
+++ b/board/toradex/common/mmc.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2016-2019 Toradex, Inc.
+ */
+
+#include <common.h>
+#include <mmc.h>
+
+/* provide a default implementation */
+__weak int mmc_map_to_kernel_blk(int dev_no)
+{
+	return dev_no;
+}