microwatt/openocd/ecp5-evn.cfg

# this supports ECP5 Evaluation Board

interface ftdi
ftdi_device_desc "Lattice ECP5 Evaluation Board"
ftdi_vid_pid 0x0403 0x6010
# channel 1 does not have any functionality
ftdi_channel 0
# just TCK TDI TDO TMS, no reset
ftdi_layout_init 0xfff8 0xfffb
reset_config none

# default speed
adapter_khz 5000
Initial support for ghdl synthesis A first pass at ghdl synthesis using yosys and nextpnr. It runs hello world or micropython if the FPGA has enough block RAM (eg ECP5 85F). The hello world testcase also loops UART rx to tx in software (ie not a hardware loopback). It uses Docker images, so no software needs to be installed. If you prefer podman you can use that too. Edit Makefile.synth to configure your FPGA, JTAG device etc. To build: make -f Makefile.synth and to program: make -f Makefile.synth prog A few issues: We need to add PLL support. Right now Microwatt runs at whatever the external clock frequency is and the baud rate gets scaled by how far off 50MHz it is. This means on the ecp5-evn with a 12 MHz clock rate the baud rate is a quite strange 27650 (115200 * 50 / 12). On my OrangeCrab with a 50MHz clock the UART is 115200. It uses a large amount of resources, way more than it should. There are still some ghdl/yosys issues to be sorted out. Signed-off-by: Anton Blanchard <anton@linux.ibm.com> 5 years ago			`# this supports ECP5 Evaluation Board`

			`interface ftdi`
			`ftdi_device_desc "Lattice ECP5 Evaluation Board"`
			`ftdi_vid_pid 0x0403 0x6010`
			`# channel 1 does not have any functionality`
			`ftdi_channel 0`
			`# just TCK TDI TDO TMS, no reset`
			`ftdi_layout_init 0xfff8 0xfffb`
			`reset_config none`

			`# default speed`
			`adapter_khz 5000`