Difference between revisions of "DFU Bootloader"
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| − | [[Category:STM32]][[Category:USB | + | [[Category:STM32]][[Category:USB]][[Category:STM32 Development]][[Category:Work in progress]] |
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All [[STM32]] MCUs have a built-in bootloader which will allow reflashing. The [[Boot0]] pin is used to toggle between "normal" boot and this bootloader. Unfortunately this process can not be controlled without manipulating the [[Boot0]] pin, so if we want to control this from our application, we will have to implement our own bootloader. | All [[STM32]] MCUs have a built-in bootloader which will allow reflashing. The [[Boot0]] pin is used to toggle between "normal" boot and this bootloader. Unfortunately this process can not be controlled without manipulating the [[Boot0]] pin, so if we want to control this from our application, we will have to implement our own bootloader. | ||
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! | ! | ||
! | ! | ||
| − | ! Start Addr | + | ! Start Addr (incl.) |
| − | ! End Addr | + | ! End Addr (not incl.) |
! Size (hex) | ! Size (hex) | ||
! Size (kb) | ! Size (kb) | ||
| Line 22: | Line 21: | ||
| align=right | 0x8080000 | | align=right | 0x8080000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 29: | Line 28: | ||
| align=right | 0x8078000 | | align=right | 0x8078000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 36: | Line 35: | ||
| align=right | 0x8070000 | | align=right | 0x8070000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 43: | Line 42: | ||
| align=right | 0x8068000 | | align=right | 0x8068000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 50: | Line 49: | ||
| align=right | 0x8060000 | | align=right | 0x8060000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 57: | Line 56: | ||
| align=right | 0x8058000 | | align=right | 0x8058000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 64: | Line 63: | ||
| align=right | 0x8050000 | | align=right | 0x8050000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 71: | Line 70: | ||
| align=right | 0x8048000 | | align=right | 0x8048000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 78: | Line 77: | ||
| align=right | 0x8040000 | | align=right | 0x8040000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 85: | Line 84: | ||
| align=right | 0x8038000 | | align=right | 0x8038000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 92: | Line 91: | ||
| align=right | 0x8030000 | | align=right | 0x8030000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 99: | Line 98: | ||
| align=right | 0x8028000 | | align=right | 0x8028000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 106: | Line 105: | ||
| align=right | 0x8020000 | | align=right | 0x8020000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 113: | Line 112: | ||
| align=right | 0x8018000 | | align=right | 0x8018000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| | | | ||
| Line 120: | Line 119: | ||
| align=right | 0x8010000 | | align=right | 0x8010000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|- | |- | ||
| align=right | Begin | | align=right | Begin | ||
| Line 127: | Line 126: | ||
| align=right | 0x8008000 | | align=right | 0x8008000 | ||
| align=right | 0x8000 | | align=right | 0x8000 | ||
| − | | align=right | | + | | align=right | 32 kB |
|} | |} | ||
| Line 135: | Line 134: | ||
! | ! | ||
! | ! | ||
| − | ! Start Addr | + | ! Start Addr (incl.) |
| − | ! End Addr | + | ! End Addr (not incl.) |
! Size (hex) | ! Size (hex) | ||
! Size (kb) | ! Size (kb) | ||
Latest revision as of 03:52, 10 July 2021
All STM32 MCUs have a built-in bootloader which will allow reflashing. The Boot0 pin is used to toggle between "normal" boot and this bootloader. Unfortunately this process can not be controlled without manipulating the Boot0 pin, so if we want to control this from our application, we will have to implement our own bootloader.
Overall Architecture
All STM32 MCUs (indeed all ARM processors) follows the Von Neumann architecture. This essentially - in this context - means that the instruction and data memory share the same address space. Since STM32 processors are 32-bit processors and since 32-bit addresses can address 4GB (4,294,967,296 bytes), sharing the address space between instruction and data memory is not a problem.
On STM32s, programs are stored in on-chip flash memory. Different STM32s have different amount of flash memory, but common for all is that it is mapped in the address space starting from 0x08000000.
| Start Addr (incl.) | End Addr (not incl.) | Size (hex) | Size (kb) | ||
|---|---|---|---|---|---|
| End | --> | 0x8078000 | 0x8080000 | 0x8000 | 32 kB |
| 0x8070000 | 0x8078000 | 0x8000 | 32 kB | ||
| 0x8068000 | 0x8070000 | 0x8000 | 32 kB | ||
| 0x8060000 | 0x8068000 | 0x8000 | 32 kB | ||
| 0x8058000 | 0x8060000 | 0x8000 | 32 kB | ||
| 0x8050000 | 0x8058000 | 0x8000 | 32 kB | ||
| 0x8048000 | 0x8050000 | 0x8000 | 32 kB | ||
| 0x8040000 | 0x8048000 | 0x8000 | 32 kB | ||
| 0x8038000 | 0x8040000 | 0x8000 | 32 kB | ||
| 0x8030000 | 0x8038000 | 0x8000 | 32 kB | ||
| 0x8028000 | 0x8030000 | 0x8000 | 32 kB | ||
| 0x8020000 | 0x8028000 | 0x8000 | 32 kB | ||
| 0x8018000 | 0x8020000 | 0x8000 | 32 kB | ||
| 0x8010000 | 0x8018000 | 0x8000 | 32 kB | ||
| 0x8008000 | 0x8010000 | 0x8000 | 32 kB | ||
| Begin | --> | 0x8000000 | 0x8008000 | 0x8000 | 32 kB |
Under normal reset (Boot0 not activated), the MCU will jump to address 0x8000000 and begin execution from there.
| Start Addr (incl.) | End Addr (not incl.) | Size (hex) | Size (kb) | Usage | ||
|---|---|---|---|---|---|---|
| End | --> | 0x8078000 | 0x8080000 | 0x8000 | 32 kB | Application (480 kB) |
| 0x8070000 | 0x8078000 | 0x8000 | 32 kB | |||
| 0x8068000 | 0x8070000 | 0x8000 | 32 kB | |||
| 0x8060000 | 0x8068000 | 0x8000 | 32 kB | |||
| 0x8058000 | 0x8060000 | 0x8000 | 32 kB | |||
| 0x8050000 | 0x8058000 | 0x8000 | 32 kB | |||
| 0x8048000 | 0x8050000 | 0x8000 | 32 kB | |||
| 0x8040000 | 0x8048000 | 0x8000 | 32 kB | |||
| 0x8038000 | 0x8040000 | 0x8000 | 32 kB | |||
| 0x8030000 | 0x8038000 | 0x8000 | 32 kB | |||
| 0x8028000 | 0x8030000 | 0x8000 | 32 kB | |||
| 0x8020000 | 0x8028000 | 0x8000 | 32 kB | |||
| 0x8018000 | 0x8020000 | 0x8000 | 32 kB | |||
| 0x8010000 | 0x8018000 | 0x8000 | 32 kB | |||
| 0x8008000 | 0x8010000 | 0x8000 | 32 kB | |||
| Begin | --> | 0x8000000 | 0x8008000 | 0x8000 | 32 kB | Bootloader (32 kB) |