update readme after systemc cmake integration

1 files changed, 16 insertions, 4 deletions

diff --git a/README.md b/README.md
index fefa166..c6c7136 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,8 @@
 This repository serves as a playground for [SystemC/TLM2][sysc-home] and allows
 to quickly start hacking on SystemC/TLM2 simulations.
 
-The [Makefile](Makefile) documents how to download and build the SystemC
-simulator as well as build and run the simulations and tests contained in the
-repository.
+The [Makefile](Makefile) documents how to configure and build the simulations
+as well as run the tests contained in the repository.
 
 ```sh
 # Build SystemC, all simulations and tests.
@@ -27,8 +26,21 @@ file name (w/o extension) to the `simulations` list in
 
 Happy hacking.
 
+## SystemC build
+
+The SystemC simulator is automatically built as dependency in cmake. Currently
+two different build scripts are available (mainly because of own experiments).
+- [CMakeLists-sysc-fetch.txt](cmake/CMakeLists-sysc-fetch.txt) use
+  [`FetchContent`][cmake-fetch] to make SystemC available, this will treat
+  SystemC as source dependency and make all build targets available.
+- [CMakeLists-sysc-external.txt](cmake/CMakeLists-sysc-external.txt) use
+  [`ExternalProject`][cmake-external] to make SystemC available, this will
+  treat SystemC as external dependency and therefore needs to provide targets
+  manually.
+
 ## License
 This project is licensed under the [MIT](LICENSE) license.
 
 [sysc-home]: https://www.accellera.org/downloads/standards/systemc
-
+[cmake-fetch]: https://cmake.org/cmake/help/latest/module/FetchContent.html
+[cmake-external]: https://cmake.org/cmake/help/latest/module/ExternalProject.html