Are you new to Qemu and need help with specifying window size and display resolution for ARM64 emulation? You've come to the right place! In this article, we will guide you through the steps to easily specify window size and display resolution in Qemu for ARM64 emulation. Let's get started!
What is Qemu?
Qemu is an open-source machine emulator and virtualizer that allows you to run operating systems and programs on different architectures. It is widely used for software development, testing, and emulation purposes.
Specifying Window Size
When running Qemu, you might want to adjust the window size to suit your needs. To specify the window size, you can use the -vga option followed by the desired resolution. For example, if you want a window size of 800x600 pixels, you can use the following command:
qemu-system-aarch64 -vga std -display sdl,window_size=800x600
This will set the window size to 800x600 pixels. You can replace the values with your preferred resolution.
Setting Display Resolution
In addition to specifying the window size, you can also set the display resolution for ARM64 emulation in Qemu. To do this, you need to modify the virtual machine's device tree blob (DTB).
First, you need to extract the DTB file from your ARM64 image. You can use the dtc command to convert the DTB file to a human-readable format. Here's an example:
dtc -I dtb -O dts -o my_dtb.dts my_dtb.dtb
This will create a .dts file from the original DTB file. Open the .dts file with a text editor and search for the display-related properties. You will find something like this:
/ {
chosen {
bootargs = "console=ttyAMA0,38400n8";
};
display {
width = <1920>;
height = <1080>;
dpi = <96>;
};
};
In this example, the width is set to 1920 pixels, the height is set to 1080 pixels, and the dpi is set to 96. Modify these values according to your desired display resolution.
Once you have made the necessary changes, save the .dts file and convert it back to the DTB format using the following command:
dtc -I dts -O dtb -o my_dtb.dtb my_dtb.dts
This will create a new DTB file with your modified display resolution. Now, when running Qemu, specify the path to the new DTB file using the -dtb option:
qemu-system-aarch64 -M virt -cpu cortex-a57 -m 2G -dtb my_dtb.dtb -kernel my_kernel -append "console=ttyAMA0"
Replace my_dtb.dtb with the path to your modified DTB file. Qemu will now use the specified display resolution for ARM64 emulation.
Conclusion
In this article, we have learned how to specify window size and display resolution in Qemu for ARM64 emulation. By following the steps outlined above, you can easily customize the window size and display resolution according to your needs. We hope this guide has been helpful to you!
References
| Source | Link |
|---|---|
| Qemu Documentation | https://www.qemu.org/docs/master/system/index.html |
| Device Tree Compiler (dtc) | https://git.kernel.org/pub/scm/utils/dtc/dtc.git |