PIN "U3" unavailabel in ECP5's CABGA381 package

[fedy0]

Hi

I ran into the following error (please see image attached) that the pin "U3" is not available in ECP5's CABGA381 package.
But this is wrong, as I have checked the datasheets and pin U3 is available.

I specified this in the constraints file .lpf

LOCATE COMP "flash_clk" SITE "U3";
IOBUF  PORT "flash_clk" PULLMODE=DOWN IO_TYPE=LVCMOS33 DRIVE=4;

To reproduce the error please clone/run the follwoing

git clone --recursive https://github.com/fedy0/neo.git && cd ./neo && make -f Makefile.xip flash

Any prompt help would be greatly appreciated.

[gatecat]

You need to use the USRMCLK primitive to access this pin (same as in Diamond), it can't be used the same way as regular IO.