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The VExpress_GEM5_Foundation platform was reserving a region of the memory map (@ 0x4 0000 0000) for PCI. The Armv8-A FVP Foundation platform is not PCI capable at the moment, so any PCI logic is really gem5 specific. With this patch we are aligning gem5 to the FVP Base Platform, which supports PCI and it is reserving 256GiB of memory starting at 0x40 0000 0000 (256GiB). Fast Models - Reference Manual - Version 11.8 At the moment we are still supporting a single DRAM range, starting at 2GiB. So DRAM could overlap with the PCI memory region though it is unlikely to happen in near future as it would require a DRAM size > 254 GiB. JIRA: https://gem5.atlassian.net/browse/GEM5-898 Change-Id: I506fd6696cdddc39d057602581cb16b30db3f7c7 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44165 Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.