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-rw-r--r--keyboards/preonic/rev3/bootloader_defs.h7
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diff --git a/keyboards/preonic/rev3/bootloader_defs.h b/keyboards/preonic/rev3/bootloader_defs.h
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+/* Address for jumping to bootloader on STM32 chips. */
+/* It is chip dependent, the correct number can be looked up here:
+ * http://www.st.com/web/en/resource/technical/document/application_note/CD00167594.pdf
+ * This also requires a patch to chibios:
+ * <tmk_dir>/tmk_core/tool/chibios/ch-bootloader-jump.patch
+ */
+#define STM32_BOOTLOADER_ADDRESS 0x1FFFD800