QEMU does not list STM32 devices – make qemu fails

[sai040413]

Description:
I am following the ARM Cortex-M Assembly Programming course and am at S3L1 (Booting the Processor and First Assembly Program).
When I run make qemu, I get an issue where the selected device is not supported.

Steps to Reproduce:

1. Run make qemu
2. Run qemu-system-arm -machine help
3. STM32 devices do not appear in the list.

Things I Have Tried:

• Checked my code.
• Updated the ARM toolchain and QEMU.
• Still facing the issue.

Expected Behavior:
The selected device should be supported, and QEMU should run correctly.

[streetdogg]

Interesting!! I do see it listed on my codespace.

@streetdogg ➜ /workspaces/arm-m-assembly (main) $ qemu-system-arm -machine help
Supported machines are:
...
stm32vldiscovery     ST STM32VLDISCOVERY (Cortex-M3)
...

Can you confirm the version number? I see the following -

@streetdogg ➜ /workspaces/arm-m-assembly (main) $ qemu-system-arm --version
QEMU emulator version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.25)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

[sai040413]

[streetdogg]

I see that the QEMU version is older for you. Could you do sudo apt update -y followed by sudo apt upgrade -y ??

[V-HEGDE]

I also came across the same problem with the 1st command below.

qemu-system-arm -S -M $(BOARD) -cpu $(CPU) -nographic -kernel $(PROJECT).elf -gdb tcp::1234
qemu-system-arm -S -M stm32vldiscovery -cpu cortex-m3 -nographic -kernel foo.elf -gdb tcp::1234

When I tried with the second command, it got resolved.

[streetdogg]

@ V-HEGDE - Did you manually type the first command?

[V-HEGDE]

I tried both the commands manually in the terminal, then tried the same using Makefile. Only the second command worked in both the cases. I created my own Makefile.
I did not get your question exactly. I hope this answers your question.

[streetdogg]

qemu-system-arm -S -M $(BOARD) -cpu $(CPU) -nographic -kernel $(PROJECT).elf -gdb tcp::1234

This should not work from the command line when passed manually. BOARD and CPU are variables that are to be defined in the Makefile. If they are not defined in the make file, the command will fail.

[V-HEGDE]

qemu-system-arm -S -M $(BOARD) -cpu $(CPU) -nographic -kernel $(PROJECT).elf -gdb tcp::1234

I double checked the Makefile, it is working with this instruction.

Thank you!!

[streetdogg]

Awesome!!

[gaurav040287]

Hi Piyush,
I tried make qemu but it says "no rule to make target ". I checked make --version and able to see that but for qemu version I dont see any info coming. Even in the Dockerfile I cant see any commands as shown in video. please do let me know if I am missing something . I am using cloud enviornment as shown in video.

[streetdogg]

you have name the file incorrectly. It should be Makefile not Makefile.txt :)
as a result, make is not able to find any rules.