add chips4makers link

diff --git a/3d_gpu.mdwn b/3d_gpu.mdwn
index 45282f87b626778d7d0b5c04155b5056d4504d50..867750a9d300813ebf7cea7a1899e655a947964b 100644 (file)
--- a/3d_gpu.mdwn
+++ b/3d_gpu.mdwn
@@ -61,3 +61,4 @@ Progress:
 * <http://www.clifford.at/papers/2016/yosys-synth-formal/slides.pdf>
 * <http://blog.lambdaconcept.com/doku.php?id=migen:tutorial>
 * <http://chiselapp.com/user/kc5tja/repository/kestrel-3/dir?ci=6c559135a301f321&name=cores/cpu>
+* <https://chips4makers.io/blog/>