3d_gpu.mdwn

   1 # RISC-V 3D GPU / CPU / VPU
   2
   3 Note: this is a **hybrid** CPU, VPU and GPU.  It is not, as many news articles
   4 are implying, a "dedicated exclusive GPU".  The option exists to **create**
   5 a stand-alone GPU product (contact us if this is a product that you want).
   6 Our primary goal is to design a **complete** all-in-one processor
   7 (System-on-a-Chip) that happens to include a libre-licensed VPU and GPU.
   8
   9 We seek investors, sponsors, engineers and potential customers, who are
  10 interested in the creation and use of an entirely libre low-power mobile
  11 class system-on-a-chip.  Comparative benchmark performance, pincount and
  12 price is the Allwinner A64, except that the power budget target is 2.5 watts
  13 in a 16x16mm 320 to 360 pin 0.8mm FBGA package.
  14
  15 The lower pincount, lower power, and higher BGA pitch is all to reduce
  16 the cost of product development when it comes to PCB design and layout:
  17
  18 * Above 4 watts requires metal packages, thermal management and much
  19   pricier PMICs.
  20 * 0.6mm pitch BGA and below requires much more expensive PCBA techniques.
  21 * Above 600 pins begins to reduce production yields as well as increase
  22   the cost of testing and packaging.
  23
  24 We can look at larger higher-power ASICs either later or, if funding
  25 is made available, immediately.
  26
  27 See:
  28
  29 * [[shakti/m_class/libre_3d_gpu]]
  30 * [[discussion]]
  31 * Founding [[charter]]
  32 * Mailing list <http://lists.libre-riscv.org/pipermail/libre-riscv-dev/>
  33 * Crowdsupply page <https://www.crowdsupply.com/libre-risc-v/m-class>
  34 * Wiki <https://libre-riscv.org>
  35 * Git repositories <https://git.libre-riscv.org>
  36 * Bugtracker <http://bugs.libre-riscv.org>
  37 * Kazan Vulkan Driver (including 3D engine) <https://salsa.debian.org/Kazan-team/kazan>
  38 * [NLNet 2019 Milestones](http://bugs.libre-riscv.org/buglist.cgi?columnlist=assigned_to%2Cbug_status%2Cresolution%2Cshort_desc%2Ccf_budget&f1=cf_nlnet_milestone&o1=equals&query_format=advanced&resolution=---&v1=NLnet.2019.02)
  39 * NLNet Project Page <https://nlnet.nl/project/Libre-RISCV/>
  40
  41 Progress:
  42
  43 * Jul 2019: Sponsorship from Purism received.  IEEE754 FP Mul, Add, DIV,
  44   FCLASS and FCVT pipelines completed.
  45 * Jun 2019: IEEE754 FP Mul, Add, and FSM "DIV" completed.
  46 * May 2019: 6600-style scoreboard started
  47 * Apr 2019: NLnet funding approved by independent review committee
  48 * Mar 2019: NLnet funding application first and second phase passed
  49 * Mar 2019: First successful nmigen pipeline milestone achieved with IEEE754 FADD
  50 * Feb 2019: Conversion of John Dawson's IEEE754 FPU to nmigen started
  51 * Jan 2019: Second version Simple-V preliminary proposal (suited to LLVM)
  52 * 2017 - Nov 2018: Simple-V specification preliminary draft completed
  53 * Aug 2018 - Nov 2018: spike-sv implementation of draft spec completed
  54 * Aug 2018: Kazan Vulkan Driver initiated
  55 * Sep 2018: mailing list established
  56 * Sep 2018: Crowdsupply pre-launch page up (for updates)
  57 * Dec 2018: preliminary floorplan and architecture designed (comp.arch)
  58
  59 # News Articles
  60
  61 * <https://hub.packtpub.com/a-libre-gpu-effort-based-on-risc-v-rust-llvm-and-vulkan-by-the-developer-of-an-earth-friendly-computer/>
  62 * <https://riscv.org/2018/10/packt-hub-article-a-libre-gpu-effort-based-on-risc-v-rust-llvm-and-vulkan-by-the-developer-of-an-earth-friendly-computer/>
  63 * <https://www.reddit.com/r/RISCV/comments/9jts9t/theres_a_new_libre_gpu_effort_building_on_riscv/>
  64 * <https://www.linux.com/blog/2018/11/risc-v-linux-development-full-swing>
  65 * <https://www.phoronix.com/scan.php?page=news_item&px=Libre-GPU-RISC-V-Vulkan>
  66 * <https://www.heise.de/newsticker/meldung/Mobilprozessor-mit-freier-GPU-Libre-RISC-V-M-Class-geplant-4242802.html>
  67 * <https://news.ycombinator.com/item?id=18094734>
  68 * <http://www.tuxmachines.org/node/116004>
  69 * <https://linuxfr.org/users/martoni/journaux/risc-v-est-pret-pour-le-desktop>
  70 * <https://www.reddit.com/r/hardware/comments/9jlby1/theres_a_new_libre_gpu_effort_building_on_riscv/>
  71 * <http://www.eevblog.com/forum/crowd-funded-projects/libre-risc-v-m-class-with-open-source-gpu-and-kazan-vulkan-driver/>
  72 * <https://www.reddit.com/domain/libre-riscv.org/>
  73 * <https://hardware.slashdot.org/comments.pl?sid=13447940&cid=58160868>
  74 * <https://www.phoronix.com/forums/forum/hardware/graphics-cards/1080755-libre-risc-v-gpu-aiming-for-2-5-watt-power-draw-continues-being-plotted/page5>
  75 * <https://www.phoronix.com/forums/forum/hardware/processors-memory/1070828-more-details-on-the-proposed-simple-v-extension-to-risc-v-for-gpu-workloads>
  76 * <https://slashdot.org/submission/9750302/nlnet-funds-development-of-a-libre-risc-v-3d-cpu>
  77 * <https://hardware.slashdot.org/story/19/06/02/0153243/nlnet-funds-development-of-a-libre-risc-v-3d-cpu>
  78 * <https://www.phoronix.com/forums/forum/hardware/graphics-cards/1104124-libre-risc-v-snags-50k-eur-grant-to-work-on-its-risc-v-3d-gpu-chip/page6>
  79
  80 # Information Resources and Tutorials
  81
  82 * <https://github.com/timvideos/litex-buildenv/wiki/LiteX-for-Hardware-Engineers>
  83 * <https://jeffrey.co.in/blog/2014/01/d-flip-flop-using-migen/>
  84 * <http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2019-March/000705.html>
  85 * <https://chisel.eecs.berkeley.edu/api/latest/chisel3/util/DecoupledIO.html>
  86 * <http://www.clifford.at/papers/2016/yosys-synth-formal/slides.pdf>
  87 * <http://blog.lambdaconcept.com/doku.php?id=migen:tutorial>
  88 * <http://chiselapp.com/user/kc5tja/repository/kestrel-3/dir?ci=6c559135a301f321&name=cores/cpu>
  89 * <https://chips4makers.io/blog/>
  90 * <https://hackaday.io/project/7817-zynqberry>
  91 * <https://wiki.f-si.org/index.php/FSiC2019>
  92 * <https://github.com/efabless/raven-picorv32> - <https://efabless.com>
  93 * <https://efabless.com/design_catalog/default>
  94 * <https://toyota-ai.ventures/>
  95 * <https://github.com/lambdaconcept/minerva>
  96 * <https://en.wikipedia.org/wiki/Liskov_substitution_principle>
  97 * <https://en.wikipedia.org/wiki/Principle_of_least_astonishment>
  98 * <https://peertube.f-si.org/videos/watch/379ef007-40b7-4a51-ba1a-0db4f48e8b16>
  99 * <https://github.com/riscv/riscv-sbi-doc/blob/master/riscv-sbi.md>
 100 * <https://mshahrad.github.io/openpiton-asplos16.html>
 101 * <https://wiki.f-si.org/index.php/The_Raven_chip:_First-time_silicon_success_with_qflow_and_efabless>
 102 * <http://smallcultfollowing.com/babysteps/blog/2019/04/19/aic-adventures-in-consensus/>
 103 * <http://www.crnhq.org/12-Skills-Summary.aspx?rw=c>
 104 * <http://bugs.libre-riscv.org/buglist.cgi?columnlist=assigned_to%2Cbug_status%2Cresolution%2Cshort_desc%2Ccf_budget&f1=cf_nlnet_milestone&o1=equals&query_format=advanced&resolution=---&v1=NLnet.2019.02>
 105 * <https://pdfs.semanticscholar.org/5060/4e9aff0e37089c4ab9a376c3f35761ffe28b.pdf>
 106 * <http://www.acsel-lab.com/arithmetic/arith15/papers/ARITH15_Takagi.pdf>
 107 * <https://youtu.be/o5Ihqg72T3c>
 108 * <http://flopoco.gforge.inria.fr/>
 109 * Fundamentals of Modern VLSI Devices <https://groups.google.com/a/groups.riscv.org/d/msg/hw-dev/b4pPvlzBzu0/7hDfxArEAgAJ>
 110
 111 # Analog Simulation
 112
 113 * <https://github.com/Isotel/mixedsim>
 114 * <http://www.vlsiacademy.org/open-source-cad-tools.html>
 115 * <http://ngspice.sourceforge.net/adms.html>
 116 * <https://en.wikipedia.org/wiki/Verilog-AMS#Open_Source_Implementations>