Initial project barebones structure

.drone.yml

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+---
+kind: pipeline
+type: docker
+name: default
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+  - name: submodules
+    image: alpine/git
+    commands:
+      - git submodule update --recursive --remote
+  - name: build
+    image: alpine:latest
+    commands:
+      - apk add --update gcc musl-dev make cmake
+      - make
+...

.gitignore

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+.idea/
+firmware.bin

.gitmodules

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+[submodule "rrcc"]
+	path = rrcc
+	url = https://git.gammaspectra.live/FM10K/rrcc.git

COPYING

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+Copyright (c) 2021, rrc-open-firmware FM10K-Documentation Contributors
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the copyright holder nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+default: all
+
+all: firmware.bin
+
+src/rrc-as: rrcc/CMakeLists.txt
+	cd rrcc && cmake . && make -j $(nproc)
+
+firmware.bin: src/rrc-as src/entrypoint.asm
+	rrcc/rrc-as src/entrypoint.asm firmware.bin
+
+clean:
+	-rm -f firmware.bin
+	-cd rrcc && make clean

README.md

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+# rrc-open-firmware
+
+Experimental project for replacing factory firmware on FM10000 cards with custom-made code.
+
+WARNING: **This is a Work In Progress project**. Do not use on any cards you don't want to have to unbrick via manual SPI connection.
+
+### Requirements
+* [rrcc](https://git.gammaspectra.live/FM10K/rrcc) (will build it from submodule)
+* make
+
+### Compilation
+* `$ make`
+* The firmware will be output to `firmware.bin`

rrcc

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+Subproject commit bb6bcc8b5f42946d99be71963d17d393f4b300e8

src/entrypoint.asm

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+; Copyright (c) 2021, rrc-open-firmware FM10K-Documentation Contributors
+; 
+; Redistribution and use in source and binary forms, with or without
+; modification, are permitted provided that the following conditions are met:
+; 
+;     * Redistributions of source code must retain the above copyright notice,
+;       this list of conditions and the following disclaimer.
+;     * Redistributions in binary form must reproduce the above copyright
+;       notice, this list of conditions and the following disclaimer in the
+;       documentation and/or other materials provided with the distribution.
+;     * Neither the name of the copyright holder nor the names of its contributors
+;       may be used to endorse or promote products derived from this software
+;       without specific prior written permission.
+; 
+; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+entrypoint:
+    RET