[UTEST][SDIO] Add block device read and write test

components/drivers/sdio/utest/Kconfig

@@ -0,0 +1,50 @@
+menu "SDIO Test"
+
+config RT_UTEST_SDIO
+    bool "SDIO Block Read and Write Test"
+    default n
+    depends on RT_USING_SDIO
+    help
+        Verify SDIO block-device read and write paths with a real SD card.
+        The test writes directly to the configured sectors and does not use
+        DFS or format the card.
+
+if RT_UTEST_SDIO
+
+config RT_SDIO_UTEST_DEVICE_NAME
+    string "SDIO block device name"
+    default "sd0"
+    help
+        Block device used by the test, for example sd0 or sd0p0.
+
+config RT_SDIO_UTEST_START_SECTOR
+    hex "SDIO test start sector"
+    default 0x0
+    help
+        First sector used by the test. Existing data in the selected sectors
+        will be overwritten.
+
+config RT_SDIO_UTEST_SECTOR_COUNT
+    int "SDIO test sector count"
+    range 1 128
+    default 8
+    help
+        Number of contiguous sectors used by each transfer.
+
+config RT_SDIO_UTEST_LOOP_COUNT
+    int "SDIO test loop count"
+    range 1 100
+    default 3
+    help
+        Number of write/read verification loops at each test location.
+
+config RT_SDIO_UTEST_DEVICE_WAIT_MS
+    int "SDIO device wait time"
+    range 0 60000
+    default 3000
+    help
+        Time to wait for the SDIO block device to appear before failing.
+
+endif
+
+endmenu

components/drivers/sdio/utest/SConscript

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+Import('rtconfig')
+from building import *
+
+cwd     = GetCurrentDir()
+src     = []
+CPPPATH = [cwd, cwd + '/../../include']
+
+if GetDepend('RT_UTEST_SDIO'):
+    src += Glob('*.c')
+
+group = DefineGroup('utestcases', src,
+                    depend = ['RT_USING_UTESTCASES', 'RT_USING_SDIO'],
+                    CPPPATH = CPPPATH)
+
+Return('group')