liz/flipperzero-firmware
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Bootloader: cleanse system if tainted (#554)

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* Bootloader: cleanse system if tainted
* Bootloader: correctly set VTOR before jump to firmware
This commit is contained in:
あく
2021-07-02 04:04:37 +03:00
committed by GitHub
parent 5d14dce013
commit 6c9be3755c
4 changed files with 24 additions and 6 deletions
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11
bootloader/targets/f6/target.c
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@@ -15,6 +15,7 @@
// Boot request enum
#define BOOT_REQUEST_NONE 0x00000000
#define BOOT_REQUEST_DFU 0xDF00B000
#define BOOT_REQUEST_TAINTED 0xDF00F000
// Boot to DFU pin
#define BOOT_DFU_PORT GPIOB
#define BOOT_DFU_PIN LL_GPIO_PIN_11
@@ -136,8 +137,12 @@ void target_init() {
int target_is_dfu_requested() {
if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_DFU) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
return 1;
} else if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_TAINTED) {
// We came here directly from STM bootloader and chip is unusable
// One more reset required to fix it
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
NVIC_SystemReset();
}
LL_mDelay(100);
if(!LL_GPIO_IsInputPinSet(BOOT_DFU_PORT, BOOT_DFU_PIN)) {
@@ -159,6 +164,8 @@ void target_switch(void* offset) {
void target_switch2dfu() {
target_led_control("B");
// Mark system as tainted, it will be soon
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_TAINTED);
// Remap memory to system bootloader
LL_SYSCFG_SetRemapMemory(LL_SYSCFG_REMAP_SYSTEMFLASH);
target_switch(0x0);
@@ -166,6 +173,6 @@ void target_switch2dfu() {
void target_switch2os() {
target_led_control("G");
SCB->VTOR = BOOT_ADDRESS + OS_OFFSET;
SCB->VTOR = OS_OFFSET;
target_switch((void*)(BOOT_ADDRESS + OS_OFFSET));
}