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Hi all, 
after swapping our Raspberry Pi4 with a 5 things didn't work anymore as they did before, and thanks to this forum, as far as I understood there is no SPI support yet, right? 
I have also read that "rodw" you have created an image builder, and "Cornholio" you managed to patch it so it works right?
As we are trying to run the mesa 7c80 with a Raspberry Pi5, is there an image available currently that supports this combination? If not what would be the steps to "patch" it together? 

Thanks a lot in advance 

With the 5A-75B and 5A-75E we have a low cost way of creating a driver board for Linux-CNC. Based on the work of Romanetz, the project  LiteX-CNC  was started, providing a easy customizable firmware and driver to use these boards. The down-side however is that these boards require some soldering work to be done to accept inputs; I've messed up some boards in the process....

Therefore, Litex-CNC is going to be expanded to accept more FPGA's, starting with the Sipeed Tang Nano 20k. Compared with the 5A-75B it has less outputs (28 compared to 48 for the 5A-75B), but this is still enough for a simple 3 axis machine. The big advantage is that no SMT soldering skills are required to get this board up and running.

For the Raspberry-Pi I've designed a HAT, which provides:

• 7 extended PMOD-connectors. Each connector has 4 GPIO, power rails (+5V, max 200 mA) and a buffered enable signal;
• RS489 connector for communicating with for example a VFD;
• communication between Raspberry PI and FPGA using SPI in bidirectional mode (3-wire) to save on pins;
• conforms to the HAT+ specification , including a EEPROM with settings.

With the PMOD-connectors one can easily connect to break-out boards providing stepgen, GPIO (12V/24V inputs and outputs), differential encoders, etc. I'm also working to provide support for shifting data out (74HC595) and in (74HC165).

An estimation of the HAT will be around 7 Euro's, excluding the Tang Nano 20k. Inlcuding the FPGA, the price would be around the 40 Euro price point.