[libre-riscv-dev] building a simple barrel processor

Jacob Lifshay programmerjake at gmail.com
Fri Mar 8 06:10:49 GMT 2019

Just to clarify, I'm asking if you think it's a good idea to work on this
since it will take some time.

On Thu, Mar 7, 2019 at 6:07 PM Jacob Lifshay <programmerjake at gmail.com>

> I think it's a good idea for me to build a simple prototype RV64IMA barrel
> processor using nmigen, since we can evaluate design and performance and I
> can gain experience using python and nmigen (haven't actually used it yet).
> The design includes the M extension so we can evaluate what might work for
> having long instructions (div/rem). The design includes the A extension so
> we can evaluate synchronization between harts in a core.
> For the memory system, I was thinking we could have a sram for main memory
> so we don't need to deal with a ddr3 controller yet.
> I think I could get a decently working prototype in a few weeks.
> If it has a good enough design and we end up wanting to go with a barrel
> processor, we could use it as a base design for our gpu.
> Comments?
> Jacob Lifshay

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