[Libre-soc-dev] daily kan-ban update 20apr2022

lkcl 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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