efinix: add synthesis options to a dictionary in the EfinityToolchain

[jwise]

Sometimes the synthesis tool needs some help to successfully map a design, in the form of different synthesis options.

In my particular case, this didn't actually save me for my design, but it would be nice to have it available in the future if I need it again. I use this in my Platform like this:

class Platform(EfinixPlatform):
    default_clk_name   = "clk50"
    default_clk_period = 1e9/50e6

    def __init__(self, toolchain="efinity"):
        EfinixPlatform.__init__(self, "T20F256C4", _io, iobank_info=_bank_info, toolchain=toolchain)
        self.toolchain.map_opts['mode'] = 'area'

[trabucayre]

Hi,
Why not implementing efinity_args and efinity_argdict to allows users to specify/modify these parameters directly from the command line? See trellis toolchain and associated call from the platform?

Also one remark: using a dict and itertools allows to have a code more compact but its increase difficulties to read/update/maintain code.

[enjoy-digital]

Thanks @jwise, I agree with @trabucayre about using something closer to what is already present on other platforms (and to favor readability vs code compactness).

[trabucayre]

Hi @jwise.
I have written this PR, with remarks.
With this one it's possible to change synthesis parameters directly from the CLI at build time instead of having to modify the target or the platform.
It also keep the original structure, more easy to read/maintain.

Thanks

[enjoy-digital]

Thanks @jwise, @trabucayre. #2009 has been merged so we can close.