Took the work done as part of PR
ARMmbed/mbed-os#8634

Signed-off-by: Mahesh Mahadevan <[email protected]>

Tested this with the block device test inside features-storage-tests-blockdevice-general_block_device
Below was the change made to add SDIO test

--- a/features/storage/TESTS/blockdevice/general_block_device/main.cpp
+++ b/features/storage/TESTS/blockdevice/general_block_device/main.cpp
@@ -47,6 +47,8 @@
 #include "FlashIAPBlockDevice.h"
 #endif

+#include "SDIOBlockDevice.h"
+
 using namespace utest::v1;

 #define TEST_BLOCK_COUNT 10
@@ -69,6 +71,7 @@ enum bd_type {
     dataflash,
     sd,
     flashiap,
+    sdio,
     default_bd
 };

@@ -90,6 +93,11 @@ static inline uint32_t align_up(uint32_t val, uint32_t size)
 static BlockDevice *get_bd_instance(uint8_t bd_type)
 {
     switch (bd_arr[bd_type]) {
+        case sdio: {
+            static SDIOBlockDevice default_bd(P0_17);
+            return &default_bd;
+            break;
+        }
         case spif: {
 #if COMPONENT_SPIF
             static SPIFBlockDevice default_bd(
@@ -632,6 +640,8 @@ void test_get_type_functionality()
     const char *bd_type = block_device->get_type();
     TEST_ASSERT_NOT_EQUAL(0, bd_type);

+    TEST_ASSERT_EQUAL(0, strcmp(bd_type, "SDIO"));
+
 #if COMPONENT_QSPIF
     TEST_ASSERT_EQUAL(0, strcmp(bd_type, "QSPIF"));
 #elif COMPONENT_SPIF
@@ -708,10 +718,12 @@ int get_bd_count()
     bd_arr[count++] = flashiap;       //4
 #endif

+    bd_arr[count++] = sdio;       //5
+
     return count;
 }

-static const char *prefix[] = {"SPIF ", "QSPIF ", "DATAFLASH ", "SD ", "FLASHIAP ", "DEFAULT "};
+static const char *prefix[] = {"SPIF ", "QSPIF ", "DATAFLASH ", "SD ", "FLASHIAP ", "SDIO ", "DEFAULT "};

 int main()
 {

Signed-off-by: Mahesh Mahadevan <[email protected]>

Remove some warnings

add get_default_instance