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Add NVM interface to memory controller. This can be used with or instead of the existing DRAM interface. Therefore, a single controller can interface to either DRAM or NVM, or both. Specifically, a memory channel can be configured as: - Memory controller interfacing to DRAM only - Memory controller interfacing to NVM only - Memory controller interfacing to both DRAM and NVM How data is placed or migrated between media types is outside of the scope of this change. The NVM interface incorporates new static delay parameters for read and write completion. The interface defines a 2 stage read to manage non-deterministic read delays while enabling deterministic data transfer, similar to NVDIMM-P. The NVM interface also includes parameters to define read and write buffers on the media side (on-DIMM). These are utilized to quickly offload commands and write data, mitigating the effects of lower latency and bandwidth media characteristics. Change-Id: I6b22ddb495877f88d161f0bd74ade32cc8fdcbcc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29027 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Wendy Elsasser <wendy.elsasser@arm.com> Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Jason Lowe-Power <power.jg@gmail.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.