At least with the ARM board this is more possible then it was with PIC. But still its a tricky thing to combine OSD and 1541 handling into FPGA64 porting. The FPGA is nearly filled until now and the ARM firmware has to be adapted/expanded to act for the FPGA64 internal floppy drive.
Its nice to see the FPGA64 port work on Minimig pcb but is only some coproduct of low priority (to me).
I have the 1541 emulation working on the MCC card. The FPGA used is 3x to 4x the size of the minimig one.
The VHDL implementation is 100% compatible with the real one : for example, a game with a fastloader like Summer Games II works without problem.
The implementation quite straitforward : a D64 image is loaded from the SD-Card and encoded in GCR into the SDRAM. I have a T65 VHDL core for the 6502, the 6522 core from the VIC-20, 2KB of block RAM for the buffers, 16KB of block ROM for the firmware and a little bit of logic for the floppy disk interface (track counter, bit rate counter, sync word detection, byte ready signal, DMA interface for the floppy image in SDRAM), the logic can be easily created by analyzing the VIC-1541 schematics.