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stm32: Add support for a bootloader on stm32f0 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-12-09 21:03:05 -05:00
parent c9cb462f90
commit 79e2376993
3 changed files with 36 additions and 2 deletions
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10
src/generic/armcm_link.lds.S
View File

@ -19,7 +19,9 @@ SECTIONS
{
.text : {
. = ALIGN(4);
_text_vectortable_start = .;
KEEP(*(.vector_table))
_text_vectortable_end = .;
*(.text .text.*)
*(.rodata .rodata*)
} > rom
@ -27,6 +29,14 @@ SECTIONS
. = ALIGN(4);
_data_flash = .;
#if CONFIG_ARMCM_RAM_VECTORTABLE
.ram_vectortable (NOLOAD) : {
_ram_vectortable_start = .;
. = . + ( _text_vectortable_end - _text_vectortable_start ) ;
_ram_vectortable_end = .;
} > ram
#endif
.data : AT (_data_flash)
{
. = ALIGN(4);

9
src/stm32/Kconfig
View File

@ -93,9 +93,9 @@ config STACK_SIZE
default 512
choice
prompt "Bootloader offset" if MACH_STM32F407 || MACH_STM32F103
prompt "Bootloader offset" if MACH_STM32F407 || MACH_STM32F103 || MACH_STM32F070
config STM32_FLASH_START_2000
bool "8KiB bootloader (stm32duino)" if MACH_STM32F103
bool "8KiB bootloader (stm32duino)" if MACH_STM32F103 || MACH_STM32F070
config STM32_FLASH_START_7000
bool "28KiB bootloader" if MACH_STM32F103
config STM32_FLASH_START_8000
@ -110,6 +110,11 @@ config FLASH_START
default 0x8008000 if STM32_FLASH_START_8000
default 0x8000000
config ARMCM_RAM_VECTORTABLE
bool
default y if MACH_STM32F0 && FLASH_START != 0x8000000
default n
choice
prompt "Clock Reference" if LOW_LEVEL_OPTIONS
config STM32_CLOCK_REF_8M

19
src/stm32/stm32f0.c
View File

@ -99,6 +99,22 @@ usb_request_bootloader(void)
NVIC_SystemReset();
}
// Copy vector table and remap ram so new vector table is used
static void
enable_ram_vectortable(void)
{
// Symbols created by armcm_link.lds.S linker script
extern uint32_t _ram_vectortable_start, _ram_vectortable_end;
extern uint32_t _text_vectortable_start;
uint32_t count = (&_ram_vectortable_end - &_ram_vectortable_start) * 4;
__builtin_memcpy(&_ram_vectortable_start, &_text_vectortable_start, count);
barrier();
enable_pclock(SYSCFG_BASE);
SYSCFG->CFGR1 |= 3 << SYSCFG_CFGR1_MEM_MODE_Pos;
}
#if !CONFIG_STM32_CLOCK_REF_INTERNAL
DECL_CONSTANT_STR("RESERVE_PINS_crystal", "PF0,PF1");
#endif
@ -188,6 +204,9 @@ armcm_main(void)
SystemInit();
if (CONFIG_ARMCM_RAM_VECTORTABLE)
enable_ram_vectortable();
// Set flash latency
FLASH->ACR = (1 << FLASH_ACR_LATENCY_Pos) | FLASH_ACR_PRFTBE;