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![]() Add a temporary gcc patch to remove hardware divide instructions. Also add a firmware.hex file built with a gcc with the above patch. Right now micropython assumes 1MB of BRAM, which limits the FPGAs we can run on. We should be able to cut it down somewhat. Signed-off-by: Anton Blanchard <anton@linux.ibm.com> |
5 years ago | |
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fpga | 5 years ago | |
scripts | 5 years ago | |
tests | 5 years ago | |
.gitignore | 5 years ago | |
LICENSE | 5 years ago | |
Makefile | 5 years ago | |
README.md | 5 years ago | |
common.vhdl | 5 years ago | |
core.vhdl | 5 years ago | |
core_tb.vhdl | 5 years ago | |
cr_file.vhdl | 5 years ago | |
crhelpers.vhdl | 5 years ago | |
decode1.vhdl | 5 years ago | |
decode2.vhdl | 5 years ago | |
decode_types.vhdl | 5 years ago | |
execute1.vhdl | 5 years ago | |
execute2.vhdl | 5 years ago | |
fetch1.vhdl | 5 years ago | |
fetch2.vhdl | 5 years ago | |
glibc_random.vhdl | 5 years ago | |
glibc_random_helpers.vhdl | 5 years ago | |
helpers.vhdl | 5 years ago | |
loadstore1.vhdl | 5 years ago | |
loadstore2.vhdl | 5 years ago | |
multiply.vhdl | 5 years ago | |
multiply_tb.vhdl | 5 years ago | |
ppc_fx_insns.vhdl | 5 years ago | |
register_file.vhdl | 5 years ago | |
sim_console.vhdl | 5 years ago | |
sim_console_c.c | 5 years ago | |
simple_ram_behavioural.vhdl | 5 years ago | |
simple_ram_behavioural_helpers.vhdl | 5 years ago | |
simple_ram_behavioural_helpers_c.c | 5 years ago | |
simple_ram_behavioural_tb.bin | 5 years ago | |
simple_ram_behavioural_tb.vhdl | 5 years ago | |
wishbone_arbiter.vhdl | 5 years ago | |
wishbone_types.vhdl | 5 years ago | |
writeback.vhdl | 5 years ago |
README.md
Microwatt
A tiny Open POWER ISA softcore written in VHDL 2008. It aims to be simple and easy to understand.
Simulation
- Build micropython. If you aren't building on a ppc64le box you will need a cross compiler. If it isn't available on your distro grab the powerpc64le-power8 toolchain from https://toolchains.bootlin.com
git clone https://github.com/mikey/micropython
cd micropython
git checkout powerpc
cd ports/powerpc
make -j$(nproc)
cd ../../../
- Microwatt uses ghdl for simulation. Either install this from your distro or build it. Next build microwatt:
git clone https://github.com/antonblanchard/microwatt
cd microwatt
make
- Link in the micropython image:
ln -s ../micropython/ports/powerpc/build/firmware.bin simple_ram_behavioural.bin
- Now run microwatt, sending debug output to /dev/null:
./core_tb > /dev/null
Testing
- A simple test suite containing random execution test cases and a couple of micropython test cases can be run with:
make -j$(nproc) check
Issues
This is functional, but very simple. We still have quite a lot to do:
- Need to implement a simple non pipelined divide
- There are a few instructions still to be implemented
- Need to add caches and bypassing (in progress)
- Need to add supervisor state (in progress)