[riot-notifications] [RIOT-OS/RIOT] cpu/stm32: implement reset to bootloader (#14119)

benpicco notifications at github.com
Sat May 23 14:31:50 CEST 2020

@benpicco commented on this pull request.

> +    /* remap ROM at zero */
+#if defined(SYSCFG_MEMRMP_MEM_MODE_0)
+#elif defined(SYSCFG_CFGR1_MEM_MODE_0)
+    /* load bootloader address into r0 */
+    register uint32_t dst __asm__("r0") = STM32_LOADER_ADDR;
+    /* jump to the bootloader */
+    __asm__ volatile("mov sp, %0" :: "r" (dst));
+    __asm__ volatile("mov pc, %0" :: "r" (dst));
+void __attribute__((weak)) usb_board_reset_in_bootloader(void)

Not all STM32 parts implement a DFU bootloader, e.g. the stm32f103c8 found on the bluepill boards only implements UART mode. So there for flashing over USB you'll need a separate software bootloader like the [STM32duino-bootloader](https://github.com/rogerclarkmelbourne/STM32duino-bootloader).

This way the generic (ROM) bootloader reset can be overwritten by a board-specific boot loader reset. (And yea I'll add conditional compilation to `pre_startup()`)

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