STM32 system memory boot mode.pdf

AN2606

Application note

STM32™ microcontroller

system memory boot mode

Introduction

The bootloader is stored in the internal boot ROM memory (system memory) of STM32

devices. It is programmed by ST during production. Its main task is to download the

application program to the internal Flash memory through one of the available serial

peripherals (USART, CAN, USB, etc.). A communication protocol is defined for each serial

interface, with a compatible command set and sequences.

The main features of the bootloader are the following:

●

It uses an embedded serial interface to download the code with a predefined

communication protocol

●

It transfers and updates the Flash memory code, the data, and the vector table sections

This application note presents the general concept of the bootloader. It describes the

supported peripherals and hardware requirements to be considered when using the

bootloader of any STM32 device currently in production. However the specifications of the

low-level communication protocol for each supported serial peripheral are documented in

separate documents:

●

For specifications of the USART protocol used in the bootloader please refer to

AN3155

●

For the specification of CAN protocol used in the bootloader please refer to AN3154

●

For the specification of DFU (USB Device) protocol used in the bootloader please refer

to AN3156

Related documents (available from www.st.com )

●

STM32 datasheets:

– low, medium and high-densitySTM32F101xx and STM32F103xx datasheets

– low, medium and high-density STM32F100xx and STM32F102xx datasheets

– STM32F105xx/107xx connectivity line datasheet

– XL-density STM32F101xx and STM32F103xx datasheets

●

STM32 reference manuals:

– STM32F101xx, STM32F102xx, STM32F103xx and STM32F105xx/107xx

reference manual (RM0008)

– low, medium and high-density STM32F100xx value line reference manual

(RM0041)

●

STM32 Flash programming manuals

– STM32F101xx, STM32F102xx, STM32F103xx and STM32F105xx/107xx Flash

programming manual (PM0042)

– low, medium and high-density STM32F100xx value line Flash programming

manual (PM0063)

– XL-density STM32F101xx and STM32F103xx programming manual (PM0068)

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www.st.com

Contents

AN2606

Contents

General bootloader description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1

Bootloader activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2

Exiting system memory boot mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3

Bootloader identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

STM32F101xx, STM32F102xx, STM32F103xx,

medium-density and high-density value line bootloader . . . . . . . . . . . 8

2.1

Bootloader configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2

Bootloader hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.3

Bootloader selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.4

Bootloader version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

STM32F105xx and STM32F107xx device bootloader . . . . . . . . . . . . . . 11

3.1

Bootloader configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.2

Bootloader hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.3

Bootloader selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.4

Bootloader version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

STM32F101xx and STM32F103xx XL-density devices bootloader . . . 17

4.1

Dual bank boot feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2

Bootloader configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

4.3

Bootloader hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.4

Bootloader selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.5

Bootloader version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Device-dependent bootloader parameters . . . . . . . . . . . . . . . . . . . . . . 24

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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AN2606

List of tables

Table 1. Boot pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. Embedded bootloaders. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 3. STM32F10xxx configuration in system memory boot mode . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 4. STM32F10xxx bootloader versions evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 5. STM32F105xx/107xx configuration in system memory boot mode . . . . . . . . . . . . . . . . . . 11

Table 6. STM32F105xx and STM32F107xx bootloader versions evolution . . . . . . . . . . . . . . . . . . . 16

Table 7. Boot pin and BFB2 bit configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 8. STM32F10xxx XL-density configuration in system memory boot mode . . . . . . . . . . . . . . . 19

Table 9. Evolution of the XL-density bootloader versions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 10. Bootloader device dependant parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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List of figures

AN2606

List of figures

Figure 1.

Bootloader for STM32 with USART1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 2.

Bootloader selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 3.

Bootloader selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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Glossary

Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.

Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.

High-density devices are STM32F101xx and STM32F103xx microcontrollers where the

Flash memory density ranges between 256 and 512 Kbytes.

Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.

Low-density value line devices are STM32F100xx microcontrollers where the Flash

memory density ranges between 16 and 32 Kbytes.

Medium-density value line devices are STM32F100xx microcontrollers where the Flash

memory density ranges between 64 and 128 Kbytes.

High-density value line devices are STM32F100xx microcontrollers where the Flash

memory density ranges between 256 and 5128 Kbytes.

XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the

Flash memory density ranges between 768 Kbytes and 1 Mbyte.

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