boards/lckfb-szpi-esp32s3: add sdmmc defconfig

Add SD card configuration for lckfb-szpi-esp32s3 board using
SDMMC peripheral in 1-bit mode with the following pin mapping:
  - CLK: GPIO47
  - CMD: GPIO48
  - D0:  GPIO21

Features enabled:
  - ESP32S3 SDMMC driver
  - FAT filesystem with long filename (LFN) support
  - mkfatfs utility for on-device formatting

Usage:
  mkfatfs -F 32 /dev/mmcsd1
  mkdir -p /mnt/sd
  mount -t vfat /dev/mmcsd1 /mnt/sd

Update documentation with sdmmc configuration details.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

Documentation/platforms/xtensa/esp32s3/boards/lckfb-szpi-esp32s3/index.rst

@@ -486,3 +486,42 @@ Then test the IMU sensor::
   object_name:sensor_accel, object_instance:0
   sensor_gyro(now:113510000):timestamp:113510000,x:1.468750,y:1.562500,z:-0.093750,temperature:22.855469
   sensor_accel(now:113510000):timestamp:113510000,x:-0.810913,y:0.027343,z:0.571167,temperature:22.855469
+
+sdmmc
+-----
+
+Basic NuttShell configuration console and SD card enabled via SDMMC peripheral
+in 1-bit mode. The SD card pin mapping is as follows:
+
+===== ======
+Pin   GPIO
+===== ======
+CLK   GPIO47
+CMD   GPIO48
+D0    GPIO21
+===== ======
+
+You can run the configuration and compilation procedure::
+
+  $ ./tools/configure.sh lckfb-szpi-esp32s3:sdmmc
+  $ make flash -j$(nproc) ESPTOOL_PORT=/dev/ttyUSB0
+
+Then format and mount the SD card::
+
+  # Format the SD card with FAT32
+  nsh> mkfatfs -F 32 /dev/mmcsd1
+
+  # Create mount point and mount
+  nsh> mkdir -p /mnt/sd
+  nsh> mount -t vfat /dev/mmcsd1 /mnt/sd
+
+  # Verify
+  nsh> df
+    Block  Number
+    Size   Blocks     Used Available Mounted on
+       0        0        0         0 /proc
+     512 124702720        0 124702720 /mnt/sd
+
+  nsh> echo "hello" > /mnt/sd/test.txt
+  nsh> cat /mnt/sd/test.txt
+  hello

boards/xtensa/esp32s3/lckfb-szpi-esp32s3/configs/sdmmc/defconfig

@@ -0,0 +1,57 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_LEDS is not set
+# CONFIG_NSH_ARGCAT is not set
+# CONFIG_NSH_CMDOPT_HEXDUMP is not set
+CONFIG_ARCH="xtensa"
+CONFIG_ARCH_BOARD="lckfb-szpi-esp32s3"
+CONFIG_ARCH_BOARD_COMMON=y
+CONFIG_ARCH_BOARD_ESP32S3_LCKFB_SZPI=y
+CONFIG_ARCH_CHIP="esp32s3"
+CONFIG_ARCH_CHIP_ESP32S3=y
+CONFIG_ARCH_CHIP_ESP32S3WROOM1N16R8=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_XTENSA=y
+CONFIG_BOARD_LOOPSPERMSEC=16717
+CONFIG_BUILTIN=y
+CONFIG_DEBUG_FULLOPT=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_ESP32S3_SDMMC=y
+CONFIG_ESP32S3_SDMMC_CLK=47
+CONFIG_ESP32S3_SDMMC_CMD=48
+CONFIG_ESP32S3_SDMMC_D0=21
+CONFIG_ESP32S3_UART0=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+CONFIG_IDLETHREAD_STACKSIZE=3072
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=3072
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LINE_MAX=64
+CONFIG_MMCSD_CHECK_READY_STATUS_WITHOUT_SLEEP=y
+CONFIG_MMCSD_MULTIBLOCK_LIMIT=128
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=114688
+CONFIG_RAM_START=0x20000000
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDIO_WIDTH_D1_ONLY=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_SYSLOG_BUFFER=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_UART0_SERIAL_CONSOLE=y