[riot-notifications] [RIOT-OS/RIOT] riotboot: implement serial flasher (#15493)

[benpicco]

@benpicco commented on this pull request.



> + * @author      Benjamin Valentin <benpicco at googlemail.com>
+ * @}
+ */
+
+#include <string.h>
+#include "cpu.h"
+#include "riotboot/hdr.h"
+
+__attribute__((weak))
+void usb_board_reset_in_bootloader(void)
+{
+    uint32_t *magic = (void*)RIOTBOOT_MAGIC_ADDR;
+
+    irq_disable();
+    *magic = RIOTBOOT_MAGIC;
+    NVIC_SystemReset();

I'm just a bit afraid that this might mess with the magic address - some arch code does quit a bit of cleanup in `pm_reboot()`.

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