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BrunoLevy / learn-fpga

Learning FPGA, yosys, nextpnr, and RISC-V
BSD 3-Clause "New" or "Revised" License
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Out of memory while generating hex for blinky in step 20, IceStick #112

Closed dbenn closed 11 months ago

dbenn commented 11 months ago

I see this error when attempting to generate the hex file for blinky.bram.elf:

firmware_words blinker.bram.elf -ram 6144 -max_addr 6144 -out firmware.hex
   RAM SIZE=6144
   LOAD ELF: blinker.bram.elf
       max address=65676
   RAM_SIZE: 6144
Memory exceeded !

Same thing if max_addr is 65676. Thoughts? I can show how I build firmware_words, if it helps.

Would it instead be possible to do this?

riscv32-unknown-elf-objcopy --change-address 0x00000000 -O verilog blinker.bram.elf blinker.bram.hex

This generates the hex file, which In can use as firmware.hex for step 20. It loads but the run (on simulator and IceStick) yields no LEDs output.

BrunoLevy commented 11 months ago

Hi, Did you first try using the scripts and steps described in the tutorial ? (my script exist for many different boards and configurations, so if you do not strictly follow the tutorial, you may generate an executable for another configuration). In particular, this concerns the linker script used to generate the ELF.

dbenn commented 11 months ago

Hi @BrunoLevy and apologies. I've just resolved the problem. I was initially trying a docker container with the riscv toolchain because I thought it was not present or incorrectly installed on my Mac. I had also manually built firmware_words, apparently the source of the initial error message.

After using make blinker.bram.hex rather than the individual build commands, it now works fine, correctly detecting the toolchain architecture with the built code running via run.sh, verilator and on the IceStick.

Thanks for your reply and your excellent tutorial. I've successfully followed all previous steps, incorporating a Pmod dual 7-segment LED display in a number of the steps, including as a device in step 17.

BrunoLevy commented 11 months ago

Thank you very much for letting me know, and congratulation for extending it to a new device ! Cheers, -- Bruno