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Update README.md

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Fixes #74

Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2018-11-26 09:47:16 +00:00
parent fe670cf3f6
commit 024db62ef0
1 changed files with 6 additions and 4 deletions
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README.md
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@ -49,7 +49,8 @@ Getting started
### nextpnr-ice40
To build the iCE40 version of nextpnr, install [icestorm](http://www.clifford.at/icestorm/) with chipdbs installed in `/usr/local/share/icebox`.
To build the iCE40 version of nextpnr, install [icestorm](http://www.clifford.at/icestorm/) with chipdbs installed in `/usr/local/share/icebox`
(or another location, which should be passed as -DICEBOX_ROOT=/path/to/icebox to CMake).
Then build and install `nextpnr-ice40` using the following commands:
```
@ -96,8 +97,6 @@ sudo make install
- More examples of the ECP5 flow for a range of boards can be found in the [Project Trellis Examples](https://github.com/SymbiFlow/prjtrellis/tree/master/examples).
- Currently the ECP5 flow supports LUTs, flipflops and IO. IO must be instantiated using `TRELLIS_IO` primitives and constraints specified
using `LOC` and `IO_TYPE` attributes on those instances, as is used in the examples.
### nextpnr-generic
@ -116,7 +115,7 @@ Additional notes for building nextpnr
Use cmake `-D` options to specify which version of nextpnr you want to build.
Use `-DARCH=...` to set the architecture. It is semicolon separated list.
Use `-DARCH=...` to set the architecture. It is a semicolon separated list.
Use `cmake . -DARCH=all` to build all supported architectures.
The following runs a debug build of the iCE40 architecture without GUI
@ -134,6 +133,9 @@ cmake -DARCH=ice40 -DBUILD_PYTHON=OFF -DBUILD_GUI=OFF -DSTATIC_BUILD=ON .
make -j$(nproc)
```
You can change the location where nextpnr will be installed (this will usually default to `/usr/local`) by using
`-DCMAKE_INSTALL_PREFIX=/install/prefix`.
Notes for developers
--------------------