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Pynq Z1 Terminal #1774

Closed meyanik closed 1 year ago

meyanik commented 1 year ago

After using the target script for digilent pynq z1 board, i can see the led chase in my board but when i try to get bios running, i get no response from the card. is there anything i miss ?

trabucayre commented 1 year ago

Could you be more precise?

Which CPU have you selected? By default a vexriscv is used.

Do you try to use on board UART interface? For Pynq (and any others boards based on a Zynq) default UART interface is not available from PL (FPGA side): this one is connected to the PS (ARM CPU) interface. So, if its not the case, you have to add an external USB<->UART connected to PMODA:0 (tx) and PMODA:1 (rx)

meyanik commented 1 year ago

Sorry about amateur description of the problem. I used this command to generate and load the bitstream: python3 -m litex_boards.targets.digilent_pynq_z1 --build --load after loadig the bitstream i can see the chasing leds on the board but i cant connect to litex with litex_term. Is there any way to add external usb using migen. I tried using add_uart before but failed. I'm a total newbie to LiteX so sorry if questions are meaningless

trabucayre commented 1 year ago

Ok. This line uses the default SoC (vexriscv) and the PS part is unused. A serial interface is already defined for this board so no need to add extra commands.

You have to connect an external usb<->uart peripheral and using corresponding /dev/ttyUSBx where x will be 3 if the onboard interface was plugged before adaptor (see dmesg for more informations).

meyanik commented 1 year ago

Thank you. using TTL Uart converter over o PMODs did the work. Now i get the bios screen :)