[Libre-soc-dev] daily kan-ban update 20apr2022
luke.leighton at gmail.com
Wed Apr 20 18:59:41 BST 2022
On April 20, 2022 5:47:16 PM UTC, Tobias Platen <libre-soc at platen-software.de> wrote:
>I had that this condition once:
>ERROR: Max frequency for clock '$glbnet$sysclk_clk': 49.50 MHz
>(FAIL at 50.40 MHz)
yep. this is an estimate. nextpnr-xilinx ignores the error, nextpnr-ecp5 does not.
the estimate is wrong by about... 15 to 20% but it still terminates the build.
thus you can run ecppack manually, run openocd manually, and still get a working bitstream uploaded and operational.
i have even once had a bitstream at 75 mhz work when nextpnr-ecp5 complained it was only capable of 45 mhz.
this is so routine (like, *every* time) that i put the ecppack and openocd commands into the README because i was fed up of forgetting them.
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