56770a1a4c
* gemmini submodule * fix build.sbt * firechip gemmini config * bump gemmini * bump gemmini * bump gemmini * fix hwacha typo * start gemmini docs * bump gemmini * gemmini docs * Update Gemmini RST. Add quick-build instructions to Gemmini RST * start gemmini CI * bump gemmini * gemmini CI fixes * bump gemmini * fix simulator name in gemmini CI * cleanup gemmini CI * bump esp-isa-sim to include gemmini * update gemmini docs * [ci skip] fix gemmini docs typos * Update Gemmini.rst Add instructions on building Gemmini programs, or writing your own programs. * Changed order of VCS and Verilator in Gemmini docs * Remove "make your own tests" from Gemmini README * bump gemmini * try to fix midasexamples CI
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Hwacha
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The Hwacha project is developing a new vector architecture for future computer systems that are constrained in their power and energy consumption.
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The Hwacha project is inspired by traditional vector machines from the 70s and 80s, and lessons learned from our previous vector-thread architectures such as Scale and Maven
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The Hwacha project includes the Hwacha microarchitecture generator, as well as the ``XHwacha`` non-standard RISC-V extension. Hwacha does not implement the RISC-V standard vector extension proposal.
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For more information on the Hwacha project, please visit the `Hwacha website <http://hwacha.org/>`__.
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To add the Hwacha vector unit to an SoC, you should add the ``hwacha.DefaultHwachaConfig`` config mixin to the SoC configurations. The Hwacha vector unit uses the RoCC port of a Rocket or BOOM `tile`, and by default connects to the memory system through the `System Bus` (i.e., directly to the L2 cache).
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To change the configuration of the Hwacha vector unit, you can write a custom configuration to replace the ``DefaultHwachaConfig``. You can view the ``DefaultHwachaConfig`` under `generators/hwacha/src/main/scala/configs.scala <https://github.com/ucb-bar/hwacha/blob/master/src/main/scala/configs.scala>`__ to see the possible configuration parameters.
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Since Hwacha implements a non-standard RISC-V extension, it requires a unique software toolchain to be able to compile and assemble its vector instructions.
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To install the Hwacha toolchain, run the ``./scripts/build-toolchains.sh esp-tools`` command within the root Chipyard directory. This may take a while, and it will install the ``esp-tools-install`` directory within your Chipyard root directory. ``esp-tools`` is a fork of ``riscv-tools`` (formerly a collection of relevant software RISC-V tools) that was enhanced with additional non-standard vector instructions. However, due to the upstreaming of the equivalent RISC-V toolchains, ``esp-tools`` may not be up-to-date with the latest mainline version of the tools included in it.
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