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Blank screen for hello world qemu-4.2.0


From: abhijeet inamdar
Subject: Blank screen for hello world qemu-4.2.0
Date: Thu, 22 Jul 2021 14:55:45 +0200

Hi,

I have been trying to create my own machine and execute a hello_world on QEMU-4.2.0. I created mymachine.c in hw/arm and have my hello_world.c, mymachine.ld and startup_ARMCM3.S in qemu-4.2.0/proj. 

So, firstly after adding mymachine.c in hw/arm I did "make" in the build directory and it generated mymachine.o file and "LINK qemu-system-arm".

I'm using gcc-q2-2017-update for compiling and qemu to print "hello world" on the terminal.
The commands are as follows: 

gcc-arm-none-eabi-6-2017-q2-update/bin/arm-none-eabi-gcc hello_world.c startup_ARMCM3.S -mthumb -mcpu=cortex-m3 -D__STARTUP_CLEAR_BSS -D__START=main -Os -flto -ffunction-sections -fdata-sections --specs=nano.specs --specs=rdimon.specs -Wl,--gc-sections -Wl,-Map=main.map -T mymachine.ld -o main.axf

qemu command:

qemu-4.2.0/build/arm-softmmu/qemu-system-arm -M mymachine -cpu cortex-m3 -kernel main.axf -monitor none -serial stdio -semihosting -nographic 

The output I'm getting is (printf() statements from the hw/arm/mymachine.c): 
I'm Here05
I end here
I'm Here
my_hw_init
my_hw_init
step1
step2
step3
step4
step5
step6
qemu-system-arm: terminating on signal 2   (obviously killing it to exit).

Thanks in advance. 

Thank you,
Abhijeet 

Attachment: hello_world.c
Description: Binary data

Attachment: mymachine.c
Description: Binary data

Attachment: mymachine.ld
Description: Binary data

Attachment: Startup_ARMCM3.S
Description: Binary data


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