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xc7: linux litex test: remove PCF and SDC and fix XDC constrs #238

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@acomodi acomodi commented Jan 5, 2022

This fixes #235 and #234 and supersedes #236

Signed-off-by: Alessandro Comodi acomodi@antmicro.com

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>
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Can you make the .xdc file the exact output of LiteX?

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acomodi commented Jan 10, 2022

@mithro At the moment, we need to post-process the XDC generated by LiteX to avoid having unrecognized commands which are not yet implemented in the yosys plugin. Examples of these commands are the set_false_path or set_clock_groups.

IMO we may proceed by merging this PR, so we eliminate the confusion around which constraint file is to be used.

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mithro commented Jan 10, 2022

Please make sure there are bugs logged for each XDC command which doesn't work. My understanding was that we had full support for XDC needed for LiteX.

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Why is a PCF file being provided for the xc7/linux_litex_demo?
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