fossasia-22-renode/index.html
Sean Cross 6463e42057 index: add more slides
Signed-off-by: Sean Cross <sean@xobs.io>
2022-03-29 16:15:55 +08:00

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<title>Renode: Easy CI for your Weird Hardware</title>
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* Emulators are useful tools
- PC emulator (e.g. Docker on Mac, WSL on Linux)
- NES emulator -- fun and games, realtime output
- Also have debugging emulators
- Renode
* Renode Stack
- CPU cores written in C
- arm, i386, ppc, riscv, sparc, xtensa
- Windows, Mac, Linux
- Peripherals and UI written in C#
- Extensible via Python and C#
- Write once. Run anywhere. Using C# to define new peripherals
* Three major users
- Designers of new boards
- Reverse engineering exsisting hardware
- Silicon designers
* Designers of new boards
- One or more chips
- How are they connected?
- What weird hardware exists?
* Concurrent emulation of multiple devices
- Can connect multiple devices, e.g. via UART, GPIO, SPI, Ethernet, CAN...
- All devices are emulated using the same time source
- Helps to debug timing differences with different processors on a board
* Board definition format
- Easily define memory layout
- Easily move blocks around
- Only define what's necessary
- You don't need to be perfect, just good enough!
* Can read SVD files
* Hardware has Similarities
- Picture of existing register sets
- There are only so many combinations
- Rip. Mix. Burn. Many chips are just copies of one another.
* Tests in CI
* Reverse engineering existing hardware
* If it's a supported architecture, it's easy to run code
* LoadBinary and set PC
* Can skip much of the boot ROM
* Attach GDB
* Reproducible makes it easy to test theories
* Developing new Silicon blocks
* Betrusted hardware
- Create a new design in LiteX / Verilog
- Document the design
- Create a model
- Timing isn't as critical
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<section>
<section>
<h2>What is an Emulator?</h2>
<ul>
<li>Console</li>
<li>Desktop</li>
<li>CPU</li>
</ul>
</section>
<section>
<h2>Whole-System Emulator</h2>
<ul>
<li>Wii Virtual Console</li>
<li>VirtualBox</li>
<li>Parallels</li>
</ul>
</section>
<section>
<h2>Transparent Emulator</h2>
<ul>
<li>HyperV</li>
<li>WSL2/Docker</li>
<li>qemu on Linux</li>
<li>Rosetta on Mac</li>
</ul>
</section>
<section>
<h2>Debugger/Emulator</h2>
<ul>
<li>FCEUX (Nintendo Entertainment System)</li>
<li>Dolphin (Wii / Gamecube)</li>
</ul>
</section>
<section>
<h2>Renode Is All of These</h2>
<ul>
<li>Console: Able to present an interactive environment</li>
<li>Transparent: Can run in CI via Robot commands</li>
<li>Debugger: Has a GDB server built in</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Example of Weird Hardware</h2>
<ul>
<li>NRF52840</li>
<li>LM74 Temperature Sensor</li>
</ul>
</section>
<section>
<h2>Example of Weird Hardware</h2>
<ul>
<li>NRF52833</li>
<li>LM74 Temperature Sensor</li>
</ul>
</section>
<section>
<h2>Example of Weird Hardware</h2>
<ul>
<li>BlueNRG1</li>
<li>LM74 Temperature Sensor</li>
</ul>
</section>
<section>
<h2>Example of Weird Hardware</h2>
<ul>
<li>RISC-V</li>
<li>FPGA-based framebuffer</li>
<li>Initial graphical demo in 1 hour</li>
</ul>
</section>
</section>
<section>
<section>
<h2>What makes hardware "Weird"?</h2>
<ul>
<li>Unusual CPU architecture</li>
<li>Different model of chip than commonly found</li>
<li>Additional hardware</li>
<li>More CPUs per board</li>
</ul>
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<section>
<h2>Unusual CPU architecture</h2>
Sorry, can't help
</section>
<section>
<h2>Different model CPU</h2>
<ul>
<li>Maybe it's just a variant</li>
<li>Perhaps memory regions were shuffled</li>
<li>Does it use the same hardware block as someone else?</li>
</ul>
</section>
<section>
<h2>New hardware version</h2>
<ul>
<li>Do you use the new, specialized features?</li>
<li>Lots of UARTs support Infrared. Do you need that?</li>
</ul>
</section>
<section>
<h2>Completely new hardware</h2>
<ul>
<li>Time to break out C#</li>
</ul>
</section>
</section>
<section>
<section>
<h2>What is "Firmware"?</h2>
</section>
<section>
<h2>How does this interact with $VENDOR_TOOL?</h2>
</section>
<section>
<h2>What about boot ROMs?</h2>
</section>
<section>
<h2>What about missing registers?</h2>
<ul>
<li>Very few projects use built-in blocks</li>
</ul>
</section>
</section>
<section>
<section>
<h2>SVD Files</h2>
</section>
<section>
<h2>Logging Memory Accesses</h2>
</section>
<section>
<h2>Debugging with GDB</h2>
</section>
</section>
</div>
</div>
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