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generic: Add support for disabling IOB insertion

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-11-27 14:41:35 +00:00
parent 2957eb7cc9
commit 2b3dda7535
2 changed files with 9 additions and 1 deletions
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6
generic/main.cc
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@ -46,6 +46,7 @@ po::options_description GenericCommandHandler::getArchOptions()
{ {
po::options_description specific("Architecture specific options"); po::options_description specific("Architecture specific options");
specific.add_options()("generic", "set device type to generic"); specific.add_options()("generic", "set device type to generic");
specific.add_options()("no-iobs", "disable automatic IO buffer insertion");
return specific; return specific;
} }
@ -59,7 +60,10 @@ std::unique_ptr<Context> GenericCommandHandler::createContext(std::unordered_map
if (arch_name != "generic") if (arch_name != "generic")
log_error("Unsuported architecture '%s'.\n", arch_name.c_str()); log_error("Unsuported architecture '%s'.\n", arch_name.c_str());
} }
return std::unique_ptr<Context>(new Context(chipArgs)); auto ctx = std::unique_ptr<Context>(new Context(chipArgs));
if (vm.count("no-iobs"))
ctx->settings[ctx->id("disable_iobs")] = Property::State::S1;
return ctx;
} }
int main(int argc, char *argv[]) int main(int argc, char *argv[])

4
generic/pack.cc
View File

@ -249,6 +249,10 @@ static void pack_io(Context *ctx)
delete_nets.insert(net2->name); delete_nets.insert(net2->name);
} }
} }
} else if (bool_or_default(ctx->settings, ctx->id("disable_iobs"))) {
// No IO buffer insertion; just remove nextpnr_[io]buf
for (auto &p : ci->ports)
disconnect_port(ctx, ci, p.first);
} else { } else {
// Create a GENERIC_IOB buffer // Create a GENERIC_IOB buffer
std::unique_ptr<CellInfo> ice_cell = std::unique_ptr<CellInfo> ice_cell =