boot: zephyr: esp32: zephyr port

Add support for ESP32xx targets to build
as Zephyr application.

Signed-off-by: Marek Matej <marek.matej@espressif.com>
diff --git a/boot/zephyr/boards/esp32s2_franzininho.conf b/boot/zephyr/boards/esp32s2_franzininho.conf
new file mode 100644
index 0000000..70a092a
--- /dev/null
+++ b/boot/zephyr/boards/esp32s2_franzininho.conf
@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_BOOT_MAX_IMG_SECTORS=512
+CONFIG_BOOT_UPGRADE_ONLY=y
+CONFIG_BOOT_VALIDATE_SLOT0=n
+CONFIG_BOOT_SIGNATURE_TYPE_NONE=y
+CONFIG_BOOT_BANNER=n
+
+CONFIG_UART_CONSOLE=n
+CONFIG_CONSOLE=n
+CONFIG_SERIAL=n
+
+CONFIG_MCUBOOT_LOG_LEVEL_OFF=y
+CONFIG_LOG_DEFAULT_LEVEL=0
+CONFIG_DEBUG=n
+
+CONFIG_HEAP_MEM_POOL_SIZE=4096