Table 3. Embedded Bootloader Interfaces; Table 4. Memory Mapping Vs. Boot Mode/Physical Remap In Stm32F412Xx - ST STM32F412 Reference Manual

Embedded bootloader
The embedded bootloader mode is used to reprogram the Flash memory using one of the
interface described in the table below. The availability of the interface is package
dependent.
USART1
Package PA9/
PA10
UFQFPN48 Y
WLCSP64 Y
LQFP64 Y
LQFP100 Y
LQFP144 Y
UFBGA100 Y
UFBGA144 Y
The USART peripherals operate at the internal 16 MHz oscillator (HSI) frequency, while the
CAN and USB OTG FS require an external clock (HSE) multiple of 1 MHz (ranging from 4 to
26 MHz).
The embedded bootloader code is located in system memory. It is programmed by ST
during production. For additional information, refer to application note AN2606.
Physical remap in STM32F412xx
Once the boot pins are selected, the application software can modify the memory
accessible in the code area (in this way the code can be executed through the ICode bus in
place of the System bus). This modification is performed by programming the
SYSCFG memory remap register (SYSCFG_MEMRMP)
The following memories can thus be remapped:
• Main Flash memory
•
System memory
• Embedded SRAM

Table 4. Memory mapping vs. Boot mode/physical remap in STM32F412xx

0x2000 0000 - 0x2003 FFFF
0x1FFF 0000 - 0x1FFF 77FF
0x0802 0000 - 0x1FFE FFFF
0x0800 0000 - 0x080F FFFF
56/1163

Table 3. Embedded bootloader interfaces

USART2 USART3 I2C1
PD6/ PB11/ PB6/
PD5 PB10 PB7
- - Y
- - Y
- - Y
Y - Y
Y Y Y
Y Y Y
Y Y Y
Addresses
I2C
I2C2 I2C3
FMP1
PF0/ PA8/
PB14/
PF1 PB4
PB15
- Y Y
- Y Y
- Y Y
- Y Y
Y Y Y
- Y Y
Y Y Y
Boot/Remap in main
Flash memory
SRAM (256 KB)
System memory
Reserved
Flash memory
RM0402 Rev 6
SPI3
SPI1 SPI4
PA4/ PE11/
PA15/
PA5/ PE12/
PC10/
PA6/ PE13/
PC11/
PA7 PE14
PC12
Y - -
Y Y -
Y Y -
Y Y Y
Y Y Y
Y Y Y
Y Y Y
in the SYSCFG controller.
Boot/Remap in Boot/Remap in
embedded SRAM System memory
SRAM (256KB) SRAM (256KB)
System memory System memory
Reserved
Flash memory Flash memory
RM0402
CAN2 USB
PB5/ PA11
PB13 /P12
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Section 7.2.1:
Reserved