I've never tried building the bootloader using mplabx, and I only have the UMC stuff from swordfish and proton so take this with a grain of salt...
Some of the [PATH] options in the umc.ini file specify the MPASM and DB paths. You can fool it to use mpasmx.exe as the assembler, but if umcbuild is looking for the old *.dev files from MPLAB you might be SOL trying to use mplabx.
On my system I have
which is where the old mplab *.dev files were/are located on my setup. MPLABX doesn't have these files anymore, or if it does they're buried deep inside some .jar file that I've never found.Code:DB=d:\program files\microchip\mplab IDE\device
You might just be forced to install MPLAB.




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