stm32h7/linum-stm32h753bi: add support to zmodem

Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com>

Documentation/platforms/arm/stm32h7/boards/linum-stm32h753bi/index.rst

@@ -510,3 +510,45 @@ Example to blink the RBG led of board, using this example the board led status s
     led_daemon: LED set 0x03
     led_daemon: LED set 0x02
     led_daemon: LED set 0x01
+
+zmodem
+------
+
+This example use the nsh via usb and the SDCard to storage the files exchanged.
+By default the zmodem lib use the path /tmp to storage the files.
+
+Sending files to target::
+
+    # Mount the SDCard at /tmp
+    nsh> mount -t vfat /dev/mmcsd0 /tmp
+
+    # Waiting for a new file.
+    nsh> rz
+
+    # Transmitting a file to target.
+    my_pc$ sz --zmodem nuttx_logo.txt > /dev/ttyACM0 < /dev/ttyACM0
+
+    # Check if the file was received
+    nsh> ls -l /tmp
+    /tmp:
+    -rw-rw-rw-        1942 nuttx_logo.txt
+
+Transmiting a file to PC::
+
+    # Sending the file nuttx_logo.txt to PC
+    nsh> sz -x 1 /tmp/nuttx_logo.txt
+    **B00000000000000
+
+    # Using zmodem to receive a file from target
+    my_pc/temp$ rz > /dev/ttyACM0 < /dev/ttyACM0
+    Receiving: nuttx_logo.txt                         
+    Bytes received:    1942/   1942   BPS:124544
+
+    Transfer complete
+    my_pc/temp$ ls -l
+    -rw-------  1 nuttx nuttx    1942 abr  6 16:07 nuttx_logo.txt
+
+If you don't have a SDCard on your board, you can mount the TMPFS at /tmp and transfer files to it, 
+but you cannot transfer big files because TMPFS could use the free RAM of your board::
+
+    nsh> mount -t tmpfs /tmp

boards/arm/stm32h7/linum-stm32h753bi/configs/zmodem/defconfig

@@ -0,0 +1,82 @@
+#
+# 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_MMCSD_HAVE_WRITEPROTECT is not set
+# CONFIG_MMCSD_MMCSUPPORT is not set
+# CONFIG_STANDARD_SERIAL is not set
+# CONFIG_STM32H7_USE_LEGACY_PINMAP is not set
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="linum-stm32h753bi"
+CONFIG_ARCH_BOARD_LINUM_STM32H753BI=y
+CONFIG_ARCH_CHIP="stm32h7"
+CONFIG_ARCH_CHIP_STM32H753BI=y
+CONFIG_ARCH_CHIP_STM32H7=y
+CONFIG_ARCH_CHIP_STM32H7_CORTEXM7=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARMV7M_DCACHE=y
+CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y
+CONFIG_ARMV7M_DTCM=y
+CONFIG_ARMV7M_ICACHE=y
+CONFIG_BOARDCTL_USBDEVCTRL=y
+CONFIG_BOARD_LOOPSPERMSEC=43103
+CONFIG_BUILTIN=y
+CONFIG_CDCACM=y
+CONFIG_CDCACM_CONSOLE=y
+CONFIG_DEBUG_FEATURES=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_EXAMPLES_ALARM=y
+CONFIG_FAT_DMAMEMORY=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_FS_TMPFS=y
+CONFIG_GRAN=y
+CONFIG_GRAN_INTR=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INIT_STACKSIZE=4096
+CONFIG_INTELHEX_BINARY=y
+CONFIG_LIBC_MEMFD_ERROR=y
+CONFIG_LIBM=y
+CONFIG_MMCSD=y
+CONFIG_MMCSD_SDIO=y
+CONFIG_MMCSD_SDIOWAIT_WRCOMPLETE=y
+CONFIG_MM_REGIONS=4
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_DISABLE_IFUPDOWN=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_OTG_ID_GPIO_DISABLE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=245760
+CONFIG_RAM_START=0x20010000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_RTC_ALARM=y
+CONFIG_RTC_DATETIME=y
+CONFIG_RTC_DRIVER=y
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDMMC1_SDIO_MODE=y
+CONFIG_START_DAY=6
+CONFIG_START_MONTH=12
+CONFIG_START_YEAR=2011
+CONFIG_STM32H7_HSI48=y
+CONFIG_STM32H7_OTGFS=y
+CONFIG_STM32H7_PWR=y
+CONFIG_STM32H7_RTC=y
+CONFIG_STM32H7_SDMMC1=y
+CONFIG_STM32H7_USART1=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_ZMODEM=y
+CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE=1024
+CONFIG_SYSTEM_ZMODEM_RCVBUFSIZE=1024
+CONFIG_SYSTEM_ZMODEM_SNDBUFSIZE=1024
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_USBDEV=y