Add 0x0026a custom AES-128-CMAC secure bootloader, Week 11a notebook, and README links

0x0026a_custom-bootloader/bootloader/include/flash_layout.h

@@ -0,0 +1,31 @@
+/**
+ * @file flash_layout.h
+ * @brief Flash partition map shared by the bootloader and the host signer.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * MIT License
+ * Copyright (c) 2026 Kevin Thomas
+ */
+
+#ifndef FLASH_LAYOUT_H
+#define FLASH_LAYOUT_H
+
+#include <stdint.h>
+
+/** @brief Absolute base address of the bootloader image in XIP flash. */
+#define BOOTLOADER_BASE 0x10000000U
+
+/** @brief Absolute address of the one-sector firmware manifest. */
+#define FW_MANIFEST_BASE 0x1001F000U
+
+/** @brief Size in bytes of the flash sector holding the manifest. */
+#define FW_MANIFEST_SECTOR_SIZE 4096U
+
+/** @brief Absolute base address where the signed application runs. */
+#define APP_BASE 0x10020000U
+
+/** @brief Total XIP flash size in bytes on the RP2350 Pico 2 board. */
+#define FLASH_TOTAL_SIZE 0x200000U
+
+#endif