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fpga

README.md

The FPGA currently only targets the VCU118 board.

  • Build Process

cd generator make

  • Description

The generator makefile creates 4 IP blocks; proc_sys_reset, ddr4, axi_clock_converter, and ahblite_axi_bridge. Then it reads in the 4 IP blocks and builds wally. fpga/src/fpgaTop.v is the top level which instanciates wallypipelinedsoc.sv and the 4 IP blocks. The FPGA include and ILA (In logic analyzer) which provides the current instruction PCM, instrM, etc along with a large number of debuging signals.

  • Programming the flash card You'll need to write the linux image to the flash card. Use the convert2bin.py script in linux-testgen/linux-testvectors/ [*** moved?] to convert the ram.txt file from QEMU's preload to generate the binary. Then to copy sudo dd if=ram.bin of=.

  • Loading the FPGA

After the build process is complete about 2 hrs on an i9-7900x. Launch vivado's gui and open the WallyFPGA.xpr project file. Open the hardware manager under program and debug. Open target and then program with the bit file.

  • Test Run

Once the FPGA is programed the 3 MSB LEDs in the upper right corner provide status of the reset and ddr4 calibration. LED 7 should always be lit. LED 6 will light if the DDR4 is not calibrated. LED 6 will be lit once wally begins running.

Next the bootloader program will copy the flash card into the DDR4 memory. When this done the lower 5 LEDs will blink 5 times and then try to boot the program loaded in the DDR4 memory at physical address 0x8000_0000.

  • Connecting uart You'll need to connect both usb cables. The first connects the FPGA programer while the connect connects UART. UART is configured to use 57600 baud with no parity, 8 data bits, and 1 stop bit. sudo screen /dev/ttyUSB1 57600 should let you view the com port.