edit of all config data via website

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

firmware/bootloader_components/my_boot_hooks/CMakeLists.txt

@@ -0,0 +1,9 @@
+idf_component_register(SRCS "hooks.c"
+                       REQUIRES extra_component)
+
+# We need to force GCC to integrate this static library into the
+# bootloader link. Indeed, by default, as the hooks in the bootloader are weak,
+# the linker would just ignore the symbols in the extra. (i.e. not strictly
+# required)
+# To do so, we need to define the symbol (function) `bootloader_hooks_include`
+# within hooks.c source file.

firmware/bootloader_components/my_boot_hooks/hooks.c

@@ -0,0 +1,21 @@
+#include "esp_log.h"
+
+/* Function used to tell the linker to include this file
+ * with all its symbols.
+ */
+void bootloader_hooks_include(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. */
+void bootloader_before_init(void)
+{
+    ESP_LOGI("HOOK", "This hook is called BEFORE bootloader initialization");
+}
+
+void bootloader_after_init(void)
+{
+    ESP_LOGI("HOOK", "This hook is called AFTER bootloader initialization");
+}