A Xtext based SystemRDL editor with syntax highlighting and context sensitive help https://www.minres.com/#opensource
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README.md

RDL Editor

This is an editor for SystemRDL. It can be installed into any Eclipse installation using the following update site url: https://minres.github.io/RDL-Editor/repository

According to Accellera:

SystemRDL is designed to increase productivity, quality, and reuse during the design and development of complex digital systems. It can be used to share IP within and between groups, companies, and consortiums. This is accomplished by specifying a single source for the register description from which all views can be automatically generated, which ensures consistency between multiple views. A view is any output generated from the SystemRDL description, e.g., RTL code or documentation.

The source code can be found at Github. The editor is build on top of Eclipse Xtext, a framework to build Domain Specific Languages (DSL).

It has a code generator to create the register models using the SC-Components library. Due to the nature of Xtext this generator can easily be tailored to various needs.

How to use the standalone generator

You need to have Java 11 or newer available. The jar file can be downloaded at he release page. To run the standalone generator simply call:

java -jar target/com.minres.rdl.standalone-1.4.0.jar -h
Usage: RDL2code [-h] [-v] [-f] [-I <RDL include dir>] [-o <output dir>] [-sc [-n <namespace>] [-sc-dir <dir modifier>]] [-fw [-fw-dir <dir modifier>]] <input file> <input file>
    The following switches are supported:
    -h                              prints help page
    -v                              verbose output
    -f                              force overwrite existing files
    -I <RDL include dir>            include directory to search included RDL files
    -o <output dir>                 output directory of generated files
    -fw                             generate FW include files. The following sub 
                                    switches are supported:
        -fw-dir <dir modifier>      set the directory modifier (relative path to output dir
    -sc                             generate SystemC stubs. The following sub switches
                                    are supported
        -n <namespace>              the namespace to use for the generated SystemC component
        -sc-dir <dir modifier>      set the directory modifier (relative path to output dir

Generating SystemC stubs becomes

java -jar com.minres.rdl.standalone-1.4.0.jar -o generated-src -sc -n 'sysc::myns' <RDL file>

The generated SystemcC sources can then be found in the (new) directory 'generated-src'.