STM32F4 System-On-Module

The Emcraft Systems STM32F4 System-On-Module (SOM) is a compact (30 mm x 46 mm) mezzanine module that combines a 180 MHz Cortex-M4 STM32F429 microcontroller with 32 MB SDRAM, 16 MB NOR Flash and an Ethernet PHY buffer on a single board. The SOM interfaces to a baseboard (motherboard) using two 80-pin interface connectors.


Click to enlarge

Emcraft develops and maintains a Linux software distribution for the STM32F4 SOM, including Linux (uClinux) BSP (Board Support Package), U-Boot firmware and a Linux-hosted cross-development software environment.


Starter Kit


STM32F4 SOM Starter Kit


The STM32F4 SOM starter kit (KIT-STM32F4-EXT) provides a low-cost hardware platform enabling development of Linux applications using the STmicroelectronics STM32F4 devices. The kit includes the STM32F4 System-on-Module, a SOM-BSB-EXT development baseboard, and a mini-USB cable for USB-based power and serial console.

The baseboard is 100x70 mm in size and has the following main interfaces:

  • USB interface using USB-UART bridge connected to UART of the STM32F4
  • 10/100 Ethernet interface and RJ-45 connector
  • USB OTG Interface and mini-USB connector
  • Standard 20-pin ARM JTAG interface
  • User LEDs and push-button
  • Unused STM32F4 signals available on a breadboard area.

Click to enlarge

The Linux BSP and the development environment for the STM32F4 SOM starter kit are available for free download from Emcraft's web site. Each starter kit comes preloaded with uClinux and U-Boot.



STM32F4 SOM Hardware Resources


Here you will find hardware specifications, design files and various hardware materials describing the STM32F4 System-On-Module and the Starter Kit.

If you would like to ask any question about the kit hardware architecture, please do not hesitate to contact us.


STM32F4 SOM Resources Download Version # Date
STM32F4 SOM top view 2A
Dec 10, 2013
STM32F4 SOM bottom view 2A
Dec 10, 2013
STM32F4 SOM being plugged into SOM-BSB-EXT baseboard
Dec 10, 2013
High-Level Diagrams
STM32F4 SOM high-level diagram 2A
Nov 26, 2020
SOM-BSB-EXT baseboard high-level diagram 1A
Dec 19, 2013
Hardware Documentation
STM32F4 SOM hardware architecture specification
Nov 26, 2020
STM32F4 SOM pin-out
(requires registration and login)
2A Coming soon
STM32F4 SOM environmental specification 2A
May 27, 2015
STM32F4 SOM baseboard hardware architecture specification 1.1
Dec 19, 2013
STM32F4 SOM power consumption 2A
May 25, 2015
STM32F4 SOM CE certificate 2A
Jun 23, 2015
STM32F4 SOM RoHS certificate 2A
Sep 21, 2016
Hardware Materials
STM32F4 SOM 3D model
(requires registration and login)
Oct 23, 2015
SOM-BSB-EXT schematics
(requires registration and login)
Mar 11, 2018
SOM-BSB-EXT Bill-Of-Materials (BOM)
(requires registration and login)
Dec 11, 2012
SOM-BSB-EXT mechanical drawing
(requires registration and login)
Apr 1, 2013
SOM-BSB-EXT baseboard CAD design package (Altium Designer)
(requires registration and login)
Dec 17, 2013



STM32F4 System-On-Module
Release Materials


Emcraft supports Linux (uClinux) as an operating system for the STM32F4 System-On-Module (SOM). This page provides the release files of the STM32F4 SOM Linux BSP (Board Support Package) and the Linux software development environment.

All STM32F4 System-On-Modules come preloaded with uClinux and U-Boot. Full source code of the Linux BSP and U-Boot is provided for free download, along with a Linux cross-development environment. Both U-Boot and uClinux are roaylty-free.


Resources Download Version #
Release Files
Release Notes. Read this to understand features supported by this release of the product. 2.0.0
May 12, 2016
Migration from earlier releases to Release 2.0.0 2.0.0
May 12, 2016
STM32F429 SOM Linux Board Support Package (BSP) and software development environment
(requires registration and login)
May 12, 2016
GNU toolchain for uClinux Cortex-M3/M4 2010q1
Prebuilt Linux image ready to be loaded to the STM32F4 SOM
(requires registration and login)
May 12, 2016
Prebuilt U-Boot image ready for installation onto the STM32F4 SOM
(requires registration and login)
May 12, 2016



STM32F4 System-On-Module


This page provides various documentation materials for the STM32F4 System-On-Module (SOM).

If you are just starting to use the STM32F4 Starter Kit, read through the documentation materials in the order they are listed below. If you are looking for an answer to a concrete question, refer to Subject to understand the category of each specific documentation item.


Resource Subject
Download Date
Application Notes
Setting up the STM32F4 SOM starter kit #kit
May 12, 2016
Running U-Boot #uboot
May 12, 2016
Using U-Boot environment #uboot
May 10, 2016
Autobooting Linux from U-Boot #uboot
May 12, 2016
Loading Linux images via Ethernet and TFTP #uboot
May 12, 2016
Installing Linux images to Flash #uboot
May 12, 2016
Loading Linux Images over UART #uboot
May 12, 2016
Installing and activating cross development environment #tools
May 12, 2016
Cross development environment: dependency on host components #tools
May 12, 2016
Cross development environment: distribution tree #tools
May 12, 2016
Building Linux #tools
May 12, 2016
Understanding development workflow #tools
May 12, 2016
Running TCP/IP stack in Linux #connectivity
May 17, 2016
Using STM32F4 On-Chip RTC in Linux #io
June 3, 2016
Using STM32 UART ports in Linux #io
Aug 25, 2016
Flash Management and JFFS2 File System #storage
June 2, 2016
Building user-space applications #tools
June 3, 2016
Building multi-threaded applications #tools
June 3, 2016
Building C++ applications #tools
June 3, 2016
Setting the stack size for a user-space application #tools
June 3, 2016
Understanding what causes SEGV in an application #tools
June 3, 2016
Managing U-Boot Environment from Linux #uboot
June 3, 2016
Remote debugging with GDB #tools
March 29, 2017
Debugging with Eclipse


Dec 1, 2017
Building uClibc #tools
June 3, 2016
External Resources
Windows device driver for the USB/UART chip

Windows TFTP server

How to set up NFS

O'Reilly's "Linux Device Drivers"

Joseph Yiu's "Definitive Guide to the ARM Cortex-M3"


Design Kit


STM32F4 SOM Design Kit


For those customers who have successfully evaluated the STM32F4 System-On-Module and would like to proceed with designing the SOM into embedded product, Emcraft System provides the STM32F4 SOM Design Kit.

The STM32F4 SOM Design Kit is an advanced product, separate from the STM32F4 SOM Starter Kit.

The kit is comprised of the following materials and services:
  • The STM32F4 System-On-Module (SOM) schematics (PDF file only). The package is provided as an advanced hardware material allowing hardware designers to understand subtle points of the SOM implementation and interface.
  • Suggested STM32F4 SOM to baseboard mapping (Excel file). Upon purchase of the kit, you will be able to send a list of I/O requirements for your application to Emcraft. Emcraft will review and return an Excel file with recommended mapping of I/O interfaces from the SOM to your custom baseboard.
  • 1 (one) review of your custom STM32F4 SOM baseboard schematics (SOM interface section only), with detailed comments returned over email.
STM32F4 SOM Design Kit Materials Download Version # Date
STM32F4 System-On-Module (SOM) schematics (PDF format)
(requires purchase of both Starter Kit and Design Kit)
Dec 17, 2013




Ordering Info

Contact Emcraft to receive detailed pricelists or place an order.

If you would like to purchase the standard configuration of the STM32F4 SOM in small quantity (up to 100 units) and don't want to go through the formal PO process, you can make a purchase at the Emcraft online store.

Due to market conditions, please contact us about part availability.


Part Number Description
SOM-STM32F4 STmicro STM32F429, 180MHz,
Industrial (-40 to +85C), 32MB SDRAM,









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