Yes, happy to look into fixing this. I think this is a known issue already that I started looking at, where it gets confused because the pad has two connections to it (the TBUF and the input buffer). Just need to work out how to fix this.
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Weirdly I can't reproduce this on my system - although there still is another issue with TBUF, I don't think this triggers it. I'm not sure why you're seeing this, what version of Yosys and arachne-pnr are you using?
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Replying to @fpga_dave @oe1cxw
Yosys 0.7+336 (git sha1 adf1754, clang 3.8.0-2ubuntu4 -fPIC -Os)
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I'm not sure whether any of the changes,
@oe1cxw may know, but I'm on Yosys 0.7+443 (git sha1 e97f10b1, clang 5.0.1 -fPIC -Os). Can you try upgrading your Yosys and arachne-pnr to the latest git masters?1 reply 0 retweets 1 like -
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I now have Yosys 0.7 +449. Synthesis passes without error and a bitstream is generated. However, the resulting bitstream is non-functional. For example, I have the 'pin_pu' signal assigned to '1', but even that is not being driven to one when downloaded. icecube2 works.
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Thanks. I'll look into this further. Can you confirm CDONE is actually going high?
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Looking at things something is definitely wrong with the bitstream, almost as if arachne-pnr is ignoring the pin assignments. I will continue to investigate.
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Never mind, was looking at the icebox_vlog output incorrectly, pretty pin_pu should at least be being driven high.
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Replying to @fpga_dave @oe1cxw
The design uses a warmboot component, is this the first time it's been used in icestorm toolchain?
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Replying to @TinyFPGA @fpga_dave
No. It's tested: http://svn.clifford.at/handicraft/2017/ice40multidemo/ …
10:14 AM - 4 Feb 2018
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