eFuse error when running on qemu-system-riscv32

[yaghmr]

I am trying to run the esp-insights app for ESP32-C3 in QEMU using Espressif's qemu-system-riscv32. After compiling it and creating the flash with esptool.py as mentioned here: https://github.com/espressif/esp-toolch ... to-emulate, I get the error "W (114) eFuse: calibration efuse version does not match, set default version to 0" at startup, and the application freezes.

What could be causing this?

[Harshal5]

Hello @yaghmr,

It looks like ADC self-calibration is yet to be supported in ESP32-C3 QEMU. A quick fix for this would be burning the efuse BLK_VERSION_MAJOR (reference) by which you could bypass the self-calibration step.

Before running the application using QEMU, you need to burn the efuse BLK_VERSION_MAJOR using the following steps:

1. Start QEMU in download mode:

   build/qemu-system-riscv32 -nographic \
   -machine esp32c3 \
   -drive file=flash_image.bin,if=mtd,format=raw \
   -global driver=esp32c3.gpio,property=strap_mode,value=0x02 \
   -drive file=qemu_efuse.bin,if=none,format=raw,id=efuse \
   -global driver=nvram.esp32c3.efuse,property=drive,value=efuse \
   -serial tcp::5555,server,nowait

2. Burn the efuse:

   espefuse.py --before no_reset -p socket://localhost:5555 burn_efuse BLK_VERSION_MAJOR 1

Finally, you should be able to run the application.

[yaghmr]

I ran qemu-system-riscv32 and it says:

QEMU 8.1.3 monitor - type 'help' for more information
Adding SPI flash device
(qemu)

Then I launched espefuse.py and it says:

Reading updated efuses...
Checking efuses...
Successful

Now, what command should I use to start the application?

[mKlemmOrg]

Hallo @yaghmr, (and also others coming here):

the qemu-system-riscv32 as provided by @Harshal5 boots into UART0 download mode (see bootmodes).

So a easy an easy way would be following the commands you already did, close your qemu [q]. (If you want to, you can have a look into qemu_fuse.bin, there should 0x3C04 be "1" now). Now you can just start qemu again in normal boot mode referencing the qemu_efuse.bin

(you can also save it to not have to redo this process when rebuilding the project)

The command to start your application would be:

qemu-system-riscv32 -nographic \
    -machine esp32c3 \
    -drive file=flash_image.bin,if=mtd,format=raw \
    -global driver=esp32c3.gpio,property=strap_mode,value=0x08 \
    -drive file=qemu_efuse.bin,if=none,format=raw,id=efuse \
    -global driver=nvram.esp32c3.efuse,property=drive,value=efuse

However, you might have to do more adaptions (depending on your specific code) to get it run (was the case for me), but maybe it is one step further.

[Harshal5]

Very sorry for the late response.

Now, what command should I use to start the application?

As correctly mentioned by @mKlemmOrg, you need to boot qemu-system-riscv32 in the boot mode using te following command:

qemu-system-riscv32 -nographic \
    -machine esp32c3 \
    -drive file=flash_image.bin,if=mtd,format=raw \
    -global driver=esp32c3.gpio,property=strap_mode,value=0x08 \
    -drive file=qemu_efuse.bin,if=none,format=raw,id=efuse \
    -global driver=nvram.esp32c3.efuse,property=drive,value=efuse