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Author SHA1 Message Date
whitequark 3e2ecdf2fb build.res,vendor: place clock constraint on port, not net, if possible. 
For most toolchains, these are functionally identical, although ports
tend to work a bit better, being the common case. For Vivado, though,
it is necessary to place them on the port because its timing analyzer
considers input buffer delay.

Fixes #301.
 2020-02-06 23:37:15 +00:00
Emily a783e4645d Refactor build script toolchain lookups. 
Now environment variable overrides no longer infect the build scripts.

_toolchain.overrides is dropped as probably misguided in the first place.

Fixes #251.
 2019-10-13 13:53:24 +00:00
whitequark ef741594b5 vendor.lattice_machxo2: new supported family. 2019-10-10 16:22:29 +00:00