428 lines
12 KiB
HTML
428 lines
12 KiB
HTML
<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Fomu: An FPGA in your USB Port</title>
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<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
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<meta name="author" content="Sean "xobs" Cross">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<link rel="stylesheet" href="css/theme/solarized.css" id="theme">
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<link rel="stylesheet" href="lib/css/zenburn.css">
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var link = document.createElement('link');
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<script src="lib/js/html5shiv.js"></script>
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<![endif]-->
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<style>
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/*********************************************
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* ZOOM REVERSE TRANSITION (i.e. zoom out)
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*********************************************/
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.reveal .slides section[data-transition=zoomrev],
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.reveal.zoomrev .slides section:not([data-transition]) {
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transition-timing-function: ease;
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transform: translate(0, 150%);
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-webkit-transform: translate(0, -150%);
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transform: translate(0, -150%);
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}
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</style>
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</head>
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<body>
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<!-- Start of main presentation -->
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<div class="reveal">
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<div class="footer">
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<a class="url" href="https://p.xobs.io/td19/">p.xobs.io/td19</a>
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<span class="theme">Teardown 2019</span><span class="hashtag"> | #teardown2019</span><span class="twitter"> |
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@teardown</span>
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</div>
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<div class="slides">
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<section>
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<h2>Fomu: an FPGA in your USB Port</h2>
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<img src="img/tomu-fomu-case-superwide.jpg">
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<p>
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Fomu (with case): an FPGA in your USB port. Crowdfunding now! One week to go. <a href="https://t.xobs.io/fomu">t.xobs.io/fomu</a>
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</p>
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</section>
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<section data-background-image="css/theme/lca2019-title-bg-transparent.svg">
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<h1>Fomu: An FPGA in your USB Port</h1>
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<h4>A whirlwind introduction to Fomu and FPGAs</h4>
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<p align="right">
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<small>Sean Cross - <a href="https://xobs.io/">https://xobs.io/</a> - @xobs</small>
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</p>
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</section>
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<section>
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<h3>Outline</h3>
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<ol>
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<li>Fomu Firmware Layout</li>
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<li>
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<ol>
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<li>Bootloader</li>
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<li>Recovery</li>
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<li>Magic constants</li>
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<li>Interpreters</li>
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<li>Updates</li>
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</ol>
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</li>
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<li>Loading firmware onto Fomu</li>
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<li>Blinkenlights</li>
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</ol>
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</section>
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<section>
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<h2>Workshop Outline</h2>
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<ol>
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<li>What do I need to get started?</li>
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<li>What is Fomu, and what is an FPGA?</li>
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<li>What can I do with Fomu?</li>
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<li>What makes Fomu special?</li>
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</ol>
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</section>
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<section>
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<section>
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<h2>What do I need to get started?</h2>
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<ol>
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<li>Synthesis</li>
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<li>Place-and-Route</li>
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<li>Packer</li>
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</ol>
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</section>
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</section>
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<section>
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<section>
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<h2>What is an FPGA?</h2>
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<p>
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An FPGA is like a hardware emulator. It can change itself so that it can take on the characteristics of any other digital logic.
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</p>
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<p>
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FPGAs are measured in resources called LUTs or LCs.
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</p>
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</section>
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<section>
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<h2>What is Fomu?</h2>
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<p>
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Fomu is an FPGA that fits in your USB port. It has foru buttons, 2 MB of SPI flash, an RGB LED, and an ICE40UP5K with 5280 LCs. It also has 128 kB of dedicated RAM, not counting the block RAM.
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Unlike many other PCBs, Fomu does not have a separate USB controller chip. This means that any projects that want to use the USB port must include a USB softcore.
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</p>
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</section>
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<section>
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<h2>Fomu Block Design Diagram</h2>
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</section>
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<section>
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<h2>ICE40 Features</h2>
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</section>
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<section>
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<h2>What is this PCB?</h2>
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<p>
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This is Fomu EVT1. This is the original stretch prototype of Fomu. The schematics are the same, but much has changed:
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* Name changed from Tomu-FPGA to Fomu
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* Package changed from SG48 to WLCSP32
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Additionally, some patches were needed to get this PCB working:
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* SO-8 for SPI flash was too small
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* Crystal footprint was upside-down
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These are yours to take home with you!
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Differences between EVT1 and EVT3:
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* Silkscreen on Raspberry Pi header
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* Populate Raspberry Pi header
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* Add PMOD pins to touchpads
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* Swap PMODa pins for I3C
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</p>
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</section>
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<section>
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<h2>What modifications does it have?</h2>
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<ul>
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<li>Shorting out two zero-ohm resistors</li>
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<li>Programming SPI flash</li>
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<li>Bending SPI flash pins inward</li>
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<li>Mounting crystal on its side</li>
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<li>Attaching power to crystal</li>
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</ul>
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</section>
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</section>
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<section>
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<section>
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<h2>Working with Fomu</h2>
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</section>
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<section>
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<h2>"fail safe" bootloader</h2>
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Using dfu
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</section>
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<section>
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<h2>Updating Fomu</h2>
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<code>
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sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
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❯ dfu-util -l
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dfu-util 0.9
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Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
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Copyright 2010-2016 Tormod Volden and Stefan Schmidt
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This program is Free Software and has ABSOLUTELY NO WARRANTY
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Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
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Found DFU: [1209:5bf0] ver=0101, devnum=16, cfg=1, intf=0, path="1-1.1.2", alt=0, name="Fomu DFU Bootloader v1.7.2", serial="UNKNOWN"
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sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
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❯ dfu-util -D .\pvt-installable.dfu
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dfu-util 0.9
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Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
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Copyright 2010-2016 Tormod Volden and Stefan Schmidt
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This program is Free Software and has ABSOLUTELY NO WARRANTY
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Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
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Match vendor ID from file: 1209
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Match product ID from file: 5bf0
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Opening DFU capable USB device...
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ID 1209:5bf0
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Run-time device DFU version 0101
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Claiming USB DFU Interface...
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Setting Alternate Setting #0 ...
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Determining device status: state = dfuIDLE, status = 0
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dfuIDLE, continuing
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DFU mode device DFU version 0101
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Device returned transfer size 1024
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Copying data from PC to DFU device
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Download [========= ] 36% 38912 bytes
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Download done.
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state(7) = dfuMANIFEST, status(0) = No error condition is present
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state(8) = dfuMANIFEST-WAIT-RESET, status(0) = No error condition is present
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Done!
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sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:45]
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❯ dfu-util -l
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dfu-util 0.9
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Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
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Copyright 2010-2016 Tormod Volden and Stefan Schmidt
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This program is Free Software and has ABSOLUTELY NO WARRANTY
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Please report bugs to http://sourceforge.net/p/dfu-util/tickets/
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Found DFU: [1209:5bf0] ver=0101, devnum=14, cfg=1, intf=0, path="1-1.1.2", alt=0, name="Fomu DFU Bootloader v1.8.1", serial="UNKNOWN"
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sean@PAZUZU ~\Code\Fomu\foboot\releases\v1.8.1 master ≢ [10:47]
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❯
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</code>
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</section>
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</section>
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<section>
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<h2>Levels of Fomu</h2>
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<p>
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Fomu aims to be accessable on three levels:
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<ol>
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<li>Python / Interpreted</li>
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<li>RISC-V</li>
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<li>Verilog / FPGA</li>
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</ol>
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</p>
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</section>
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<section>
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<section>
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<h2>Python / Interpreted</h2>
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<ol>
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<li><strong>Goal:</strong> Multiple interpreters, auto-reload, USB disk interface</li>
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<li><strong>Now:</strong> MicroPython binary</li>
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</ol>
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</section>
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<section>
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<h2>Loading Programs onto Fomu</h2>
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<code>dfu-util -l</code>
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<code>dfu-util -D update.bin</code>
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</section>
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<section>
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<h2>Loading MicroPython</h2>
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<code>dfu-util -D micropython.dfu</code>
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</section>
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<section>
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<h2>Connecting via serial</h2>
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</section>
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<section>
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<h2>Interacting with Fomu</h2>
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</section>
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<section>
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<h2>RGB LEDD reference</h2>
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</section>
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<section>
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<h2>Future Work</h2>
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CircuitPython, etc.
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</section>
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</section>
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<section>
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<section>
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<h2>RISC-V code</h2>
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</section>
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<section>
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<h2>LiteX Machine Model</h2>
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</section>
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<section>
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<h2>Wishbone Interface</h2>
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</section>
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<section>
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<h2>Wishbone Bridge</h2>
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</section>
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<section>
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<h2>Interacting with LEDD directly</h2>
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</section>
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<section>
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<h2>Writing RISC-V Code</h2>
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</section>
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</section>
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<section>
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<section>
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<h2>Hardware Description Language</h2>
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</section>
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<section>
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<h2>Yosys and NextPNR</h2>
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</section>
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<section>
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<h2>Blinking an LED</h2>
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</section>
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<section>
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<h2>LiteX and MiGen</h2>
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</section>
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<section>
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<h2>VexRiscv</h2>
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</section>
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</section>
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</div>
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</div> <!-- class="reveal" -->
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<!-- Start of configuration section -->
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<script src="lib/js/head.min.js"></script>
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<script src="js/reveal.js"></script>
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<script>
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var presenter = !!Reveal.getQueryHash().s;
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// More info https://github.com/hakimel/reveal.js#configuration
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Reveal.initialize({
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controls: presenter ? false : true,
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slideNumber: presenter ? null : 'c/t',
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// The "normal" size of the presentation, aspect ratio will be preserved
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// when the presentation is scaled to fit different resolutions. Can be
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// specified using percentage units.
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width: 960,
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height: 700,
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// Factor of the display size that should remain empty around the content
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margin: 0.1,
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multiplex: {
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</html> |