initial version

.github/workflows/build.yml

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+name: 'build'
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps: 
+      - uses: actions/checkout@v1
+      - name: Build bootloader and partition table
+        uses: docker://docker.io/espressif/idf:release-v4.3
+        with:
+          args: ./build.sh
+      - name: Update release
+        if: "github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/')"
+        uses: eine/tip@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          files: |
+            out/*
+          tag: latest
+          rm: true

.gitignore

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+build
+out
+sdkconfig
+sdkconfig.old

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(dummy)

README.md

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+# Bootloader and partition table for NuttX
+
+This repository contains a minimal ESP-IDF project and build scripts used to produce 2nd stage bootloader and partition table binaries. Users of NuttX RTOS can download the binaries from release artifacts in this repository.

build.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+targets="esp32 esp32s2 esp32c3"
+
+mkdir -p out
+
+for target in ${targets}; do
+    idf.py set-target ${target}
+    idf.py bootloader partition_table
+    cp build/bootloader/bootloader.bin out/bootloader-${target}.bin
+    cp build/partition_table/partition-table.bin out/partition-table-${target}.bin
+    cp sdkconfig out/sdkconfig
+done

partitions.csv

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+# Name,   Type, SubType, Offset,  Size, Flags
+factory,  app,  factory, ,        1M,

sdkconfig.defaults

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+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions.csv"