forked from cores/microwatt
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
59 lines
1.3 KiB
Markdown
59 lines
1.3 KiB
Markdown
5 years ago
|
# 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)
|