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Date: Mon, 5 May 2025 11:14:01 +0700
From: Bagas Sanjaya <bagasdotme@gmail.com>
To: Joel Fernandes <joelagnelf@nvidia.com>, linux-kernel@vger.kernel.org,
	Danilo Krummrich <dakr@kernel.org>,
	David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Jonathan Corbet <corbet@lwn.net>
Cc: nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	Alexandre Courbot <acourbot@nvidia.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Shirish Baskaran <sbaskaran@nvidia.com>,
	Alistair Popple <apopple@nvidia.com>, Timur Tabi <ttabi@nvidia.com>,
	Ben Skeggs <bskeggs@nvidia.com>, rust-for-linux@vger.kernel.org,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH v2 6/7] docs: nova-core: Document basics of the Falcon
Message-ID: <aBg7CUoAo1xyYlo8@archie.me>
References: <20250503040802.1411285-1-joelagnelf@nvidia.com>
 <20250503040802.1411285-7-joelagnelf@nvidia.com>
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On Sat, May 03, 2025 at 12:07:58AM -0400, Joel Fernandes wrote:
> +Conceptual diagram (not exact) of the Falcon and its memory subsystem is=
 as follows:
> +
> +           External Memory (Framebuffer / System DRAM)
> +                            =E2=96=B2  =E2=94=82
> +                            =E2=94=82  =E2=94=82
> +                            =E2=94=82  =E2=96=BC
> +=E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=B3=E2=94=81=E2=94=81=E2=94=BB=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=93
> +=E2=94=83                           =E2=94=82                         =
=E2=94=83
> +=E2=94=83   =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=93       =E2=94=82                         =E2=94=83
> +=E2=94=83   =E2=94=83     FBIF      =E2=94=A3=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=9B                         =E2=
=94=83  FALCON
> +=E2=94=83   =E2=94=83 (FrameBuffer  =E2=94=83   Memory Interface        =
      =E2=94=83  PROCESSOR
> +=E2=94=83   =E2=94=83  InterFace)   =E2=94=83                           =
      =E2=94=83
> +=E2=94=83   =E2=94=83  Apertures    =E2=94=83                           =
      =E2=94=83
> +=E2=94=83   =E2=94=83  Configures   =E2=94=83                           =
      =E2=94=83
> +=E2=94=83   =E2=94=83  mem access   =E2=94=83                           =
      =E2=94=83
> +=E2=94=83   =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=96=B2=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=9B                                 =E2=94=83
> +=E2=94=83           =E2=94=82                                         =
=E2=94=83
> +=E2=94=83           =E2=94=82 FBDMA uses configured FBIF apertures    =
=E2=94=83
> +=E2=94=83           =E2=94=82 to access External Memory
> +=E2=94=83           =E2=94=82
> +=E2=94=83   =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=96=BC=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=93      =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=93
> +=E2=94=83   =E2=94=83    FBDMA      =E2=94=83  cfg =E2=94=83     RISC   =
    =E2=94=83
> +=E2=94=83   =E2=94=83 (FrameBuffer  =E2=94=A3<=E2=94=80=E2=94=80=E2=94=
=80=E2=94=80>=E2=94=AB     CORE       =E2=94=A3=E2=94=80=E2=94=80=E2=94=80=
=E2=94=80=E2=94=80>. Direct Core Access
> +=E2=94=83   =E2=94=83  DMA Engine)  =E2=94=83      =E2=94=83            =
    =E2=94=83      =E2=94=83
> +=E2=94=83   =E2=94=83 - Master dev. =E2=94=83      =E2=94=83 (can run bo=
th  =E2=94=83      =E2=94=83
> +=E2=94=83   =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=96=B2=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=9B      =E2=94=83 Falcon and     =E2=94=83      =E2=94=83
> +=E2=94=83           =E2=94=82        cfg-->=E2=94=83 RISC-V code)   =E2=
=94=83      =E2=94=83
> +=E2=94=83           =E2=94=82        /     =E2=94=83                =E2=
=94=83      =E2=94=83
> +=E2=94=83           =E2=94=82        |     =E2=94=97=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=9B      =E2=94=83=
    =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=93
> +=E2=94=83           =E2=94=82        =E2=94=82                          =
   =E2=94=83    =E2=94=83   BROM     =E2=94=83
> +=E2=94=83           =E2=94=82        =E2=94=82                          =
   <=E2=94=80=E2=94=80=E2=94=80>=E2=94=AB (Boot ROM) =E2=94=83
> +=E2=94=83           =E2=94=82       /                              =E2=
=94=83    =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=9B
> +=E2=94=83           =E2=94=82      =E2=96=BC                            =
   =E2=94=83
> +=E2=94=83   =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=93                              =E2=94=83
> +=E2=94=83   =E2=94=83    IO-PMP     =E2=94=83 Controls access by FBDMA  =
   =E2=94=83
> +=E2=94=83   =E2=94=83 (IO Physical  =E2=94=83 and other IO Masters      =
   =E2=94=83
> +=E2=94=83   =E2=94=83 Memory Protect)                              =E2=
=94=83
> +=E2=94=83   =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=96=B2=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=9B                              =E2=94=83
> +=E2=94=83           =E2=94=82                                      =E2=
=94=83
> +=E2=94=83           =E2=94=82 Protected Access Path for FBDMA      =E2=
=94=83
> +=E2=94=83           =E2=96=BC                                      =E2=
=94=83
> +=E2=94=83   =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
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=E2=94=93      =E2=94=83
> +=E2=94=83   =E2=94=83       Memory                          =E2=94=83   =
   =E2=94=83
> +=E2=94=83   =E2=94=83   =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=93  =E2=94=8F=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=93  =E2=94=83      =E2=94=83
> +=E2=94=83   =E2=94=83   =E2=94=83    IMEM       =E2=94=83  =E2=94=83    =
DMEM     =E2=94=83  =E2=94=83<=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=
=E2=94=9B
> +=E2=94=83   =E2=94=83   =E2=94=83 (Instruction  =E2=94=83  =E2=94=83   (=
Data     =E2=94=83  =E2=94=83
> +=E2=94=83   =E2=94=83   =E2=94=83  Memory)      =E2=94=83  =E2=94=83   M=
emory)   =E2=94=83  =E2=94=83
> +=E2=94=83   =E2=94=83   =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=9B  =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=9B  =E2=94=83
> +=E2=94=83   =E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=9B
> +=E2=94=97=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=
=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=
=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=81=E2=94=
=81=E2=94=81=E2=94=81=E2=94=81

Wrap the diagram in literal code block. Also, note that it can look messy in
htmldocs output with certain fonts due to box drawing characters. Consider =
using
ASCII constructs (dashes and vertical bars) instead.

Thanks.

--=20
An old man doll... just what I always wanted! - Clara

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