docs: Move arc architecture docs under Documentation/arch/

Architecture-specific documentation is being moved into Documentation/arch/
as a way of cleaning up the top-level documentation directory and making
the docs hierarchy more closely match the source hierarchy.  Move
Documentation/arc into arch/ and fix all in-tree references.

Acked-by: Vineet Gupta <vgupta@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

3 files changed, 0 insertions, 105 deletions

diff --git a/Documentation/arc/arc.rst b/Documentation/arc/arc.rst
deleted file mode 100644
index 6c4d978f3f4e..000000000000
--- a/Documentation/arc/arc.rst
+++ /dev/null
@@ -1,85 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0
-
-Linux kernel for ARC processors
-*******************************
-
-Other sources of information
-############################
-
-Below are some resources where more information can be found on
-ARC processors and relevant open source projects.
-
-- `<https://embarc.org>`_ - Community portal for open source on ARC.
-  Good place to start to find relevant FOSS projects, toolchain releases,
-  news items and more.
-
-- `<https://github.com/foss-for-synopsys-dwc-arc-processors>`_ -
-  Home for all development activities regarding open source projects for
-  ARC processors. Some of the projects are forks of various upstream projects,
-  where "work in progress" is hosted prior to submission to upstream projects.
-  Other projects are developed by Synopsys and made available to community
-  as open source for use on ARC Processors.
-
-- `Official Synopsys ARC Processors website
-  <https://www.synopsys.com/designware-ip/processor-solutions.html>`_ -
-  location, with access to some IP documentation (`Programmer's Reference
-  Manual, AKA PRM for ARC HS processors
-  <https://www.synopsys.com/dw/doc.php/ds/cc/programmers-reference-manual-ARC-HS.pdf>`_)
-  and free versions of some commercial tools (`Free nSIM
-  <https://www.synopsys.com/cgi-bin/dwarcnsim/req1.cgi>`_ and
-  `MetaWare Light Edition <https://www.synopsys.com/cgi-bin/arcmwtk_lite/reg1.cgi>`_).
-  Please note though, registration is required to access both the documentation and
-  the tools.
-
-Important note on ARC processors configurability
-################################################
-
-ARC processors are highly configurable and several configurable options
-are supported in Linux. Some options are transparent to software
-(i.e cache geometries, some can be detected at runtime and configured
-and used accordingly, while some need to be explicitly selected or configured
-in the kernel's configuration utility (AKA "make menuconfig").
-
-However not all configurable options are supported when an ARC processor
-is to run Linux. SoC design teams should refer to "Appendix E:
-Configuration for ARC Linux" in the ARC HS Databook for configurability
-guidelines.
-
-Following these guidelines and selecting valid configuration options
-up front is critical to help prevent any unwanted issues during
-SoC bringup and software development in general.
-
-Building the Linux kernel for ARC processors
-############################################
-
-The process of kernel building for ARC processors is the same as for any other
-architecture and could be done in 2 ways:
-
-- Cross-compilation: process of compiling for ARC targets on a development
-  host with a different processor architecture (generally x86_64/amd64).
-- Native compilation: process of compiling for ARC on a ARC platform
-  (hardware board or a simulator like QEMU) with complete development environment
-  (GNU toolchain, dtc, make etc) installed on the platform.
-
-In both cases, up-to-date GNU toolchain for ARC for the host is needed.
-Synopsys offers prebuilt toolchain releases which can be used for this purpose,
-available from:
-
-- Synopsys GNU toolchain releases:
-  `<https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases>`_
-
-- Linux kernel compilers collection:
-  `<https://mirrors.edge.kernel.org/pub/tools/crosstool>`_
-
-- Bootlin's toolchain collection: `<https://toolchains.bootlin.com>`_
-
-Once the toolchain is installed in the system, make sure its "bin" folder
-is added in your ``PATH`` environment variable. Then set ``ARCH=arc`` &
-``CROSS_COMPILE=arc-linux`` (or whatever matches installed ARC toolchain prefix)
-and then as usual ``make defconfig && make``.
-
-This will produce "vmlinux" file in the root of the kernel source tree
-usable for loading on the target system via JTAG.
-If you need to get an image usable with U-Boot bootloader,
-type ``make uImage`` and ``uImage`` will be produced in ``arch/arc/boot``
-folder.
diff --git a/Documentation/arc/features.rst b/Documentation/arc/features.rst
deleted file mode 100644
index b793583d688a..000000000000
--- a/Documentation/arc/features.rst
+++ /dev/null
@@ -1,3 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0
-
-.. kernel-feat:: $srctree/Documentation/features arc
diff --git a/Documentation/arc/index.rst b/Documentation/arc/index.rst
deleted file mode 100644
index 7b098d4a5e3e..000000000000
--- a/Documentation/arc/index.rst
+++ /dev/null
@@ -1,17 +0,0 @@
-===================
-ARC architecture
-===================
-
-.. toctree::
-    :maxdepth: 1
-
-    arc
-
-    features
-
-.. only::  subproject and html
-
-   Indices
-   =======
-
-   * :ref:`genindex`