custom booloader hooks

Signed-off-by: Peter Siegmund <developer@mars3142.org>

bootloader_components/my_boot_hooks/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "hooks.c"
+                    INCLUDE_DIRS "include"
+)

bootloader_components/my_boot_hooks/hooks.c

@@ -0,0 +1,25 @@
+#include "hooks.h"
+
+#include "esp_log.h"
+
+const static char *TAG = "booloader_hook";
+
+/* Function used to tell the linker to include this file
+ * with all its symbols.
+ */
+void bootloader_hooks_include(void)
+{
+}
+
+void bootloader_before_init(void)
+{
+    /* Keep in my mind that a lot of functions cannot be called from here
+     * as system initialization has not been performed yet, including
+     * BSS, SPI flash, or memory protection. */
+    ESP_LOGI(TAG, "This hook is called BEFORE bootloader initialization");
+}
+
+void bootloader_after_init(void)
+{
+    ESP_LOGI(TAG, "This hook is called AFTER bootloader initialization");
+}

bootloader_components/my_boot_hooks/include/hooks.h

@@ -0,0 +1 @@
+#pragma once