How to build custom MicroPython firmware with OTA support for ESP32-S3 (16MB flash, no PSRAM)?

[aravikyr]

Hello,

I am working with an ESP32-S3 board that has 16MB flash and no PSRAM.
I want to build a custom MicroPython firmware with OTA update support.

I already have:

• ESP-IDF installed (v5.x)

• MicroPython source cloned

• Basic firmware builds working for ESP32-S3

My questions are:

1. What is the recommended way to enable OTA support when building MicroPython?

2. Do I need to use the micropython-esp32-ota

project, or is OTA already supported in the upstream MicroPython for ESP32-S3?

3.For an ESP32-S3 with 16MB flash / no PSRAM, which board definition or configuration should I use (or customize) for the build?

4.Are there specific partition table settings required to support OTA (like multiple app slots)?

5.Any example config or build steps for enabling OTA support on S3 targets?

Thanks in advance!