ST STM32F101 series Reference Manual page 62

RM0008
The values on the BOOT pins are latched on the 4th rising edge of SYSCLK after a reset. It
is up to the user to set the BOOT1 and BOOT0 pins after Reset to select the required boot
mode.
The BOOT pins are also re-sampled when exiting from Standby mode. Consequently they
must be kept in the required Boot mode configuration in Standby mode. After this startup
delay has elapsed, the CPU fetches the top-of-stack value from address 0x0000 0000, then
starts code execution from the boot memory starting from 0x0000 0004.
Due to its fixed memory map, the code area starts from address 0x0000 0000 (accessed
through the ICode/DCode buses) while the data area (SRAM) starts from address
0x2000 0000 (accessed through the system bus). The Cortex
reset vector on the ICode bus, which implies to have the boot space available only in the
code area (typically, Flash memory). STM32F10xxx microcontrollers implement a special
mechanism to be able to boot also from SRAM and not only from main Flash memory and
System memory.
Depending on the selected boot mode, main Flash memory, system memory or SRAM is
accessible as follows:
•
Boot from main Flash memory: the main Flash memory is aliased in the boot memory
space (0x0000 0000), but still accessible from its original memory space (0x800 0000).
In other words, the Flash memory contents can be accessed starting from address
0x0000 0000 or 0x800 0000.
•
Boot from system memory: the system memory is aliased in the boot memory space
(0x0000 0000), but still accessible from its original memory space (0x1FFF B000 in
connectivity line devices, 0x1FFF F000 in other devices).
•
Boot from the embedded SRAM: SRAM is accessible only at address 0x2000 0000.
Note: When booting from SRAM, in the application initialization code, you have to relocate the
vector table in SRAM using the NVIC exception table and offset register.
For XL-density devices, when booting from the main Flash memory, you have an option to
boot from any of two memory banks. By default, boot from Flash memory bank 1 is selected.
You can choose to boot from Flash memory bank 2 by clearing the BFB2 bit in the user
option bytes. When this bit is cleared and the boot pins are in the boot from main Flash
memory configuration, the device boots from system memory, and the boot loader jumps to
execute the user application programmed in Flash memory bank 2. For further details,
please refer to AN2606.
Note: When booting from Bank2 in the applications initialization code, relocate the vector table to
the Bank2 base address. (0x0808 0000) using the NVIC exception table and offset register.
Embedded boot loader
The embedded boot loader is located in the System memory, programmed by ST during
production. It is used to reprogram the Flash memory with one of the available serial
interfaces:
•
In low-, medium- and high-density devices the bootoader is activated through the
USART1 interface.
•
In XL-density devices the boot loader is activated through the following interfaces:
USART1 or USART2 (remapped).
• In connectivity line devices the boot loader can be activated through one of the
following interfaces: USART1, USART2 (remapped), CAN2 (remapped) or USB OTG
FS in Device mode (DFU: device firmware upgrade).
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Memory and bus architecture
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-M3 CPU always fetches the
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