HI Peter. The correct bitfile for a 7i92 to use a G540 has alreay been created. You just have to Download it from the mesa site and load it into the correct folder then change the INI to point it to it so PP knows where to find it on loadup.

When you first turn on the PC and it boots watch the top left hand corner and when a Cursor shows up blinking then press Shift_X_ALT and hold it down until you see the Linuxcnc Desktop then you can release the keys. NOW you are in Linux. From there you have access to the Hal files and the INI files. From here you can load the Bit file to the proper folder ( MESA)

(;-) TP