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61 lines
3.1 KiB
Markdown
61 lines
3.1 KiB
Markdown
# Troubleshooting
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In case of an error, you might find an answer of how to deal it here.
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## Building SerenityOS
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### CMake fails to configure the build because it's outdated
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Ensure your CMake version is >= 3.16 with `cmake --version`. If your system doesn't provide a suitable
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version of CMake, you can download a binary release from the [CMake website](https://cmake.org/download).
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### QEMU is missing or is outdated
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Ensure your [QEMU](https://www.qemu.org/) version is >= 5 with `qemu-system-i386 -version`. Otherwise,
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install it. You can also build it using the `Toolchain/BuildQemu.sh` script.
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### GCC is missing or is outdated
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Ensure your gcc version is >= 11 with `gcc --version`. Otherwise, install it. If your gcc binary is not
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called `gcc` you have to specify the names of your C and C++ compiler when you run cmake, e.g.
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`cmake ../.. -GNinja -DCMAKE_C_COMPILER=gcc-11 -DCMAKE_CXX_COMPILER=g++-11`.
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## Running SerenityOS
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### The VM is really slow
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On Linux, QEMU is significantly faster if it's able to use KVM. The run script will automatically enable KVM
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if `/dev/kvm` exists and is readable+writable by the current user. On Windows, ensure that you have
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WHPX acceleration enabled.
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### Slow boot on HiDPI systems
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On some Windows systems running with >100% scaling, the booting phase of Serenity might slow to a crawl. Changing the
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zoom settings of the QEMU window will speed up the emulation, but you'll have to squint harder to read the smaller display.
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The default display backend (`SERENITY_QEMU_DISPLAY_BACKEND=sdl,gl=off`) does _not_ have this problem. If you're
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running into this problem, make sure you haven't changed the QEMU display backend.
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A quick workaround is opening the properties of the QEMU executable at `C:\Program Files\qemu\qemu-system-x86_64.exe`, and
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in the Compatibility tab changing the DPI settings to force the scaling to be performed by the System, by changing the
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setting at at the bottom of the window. The QEMU window will now render at normal size while retaining acceptable emulation speeds.
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This is being tracked as issue [#7657](https://github.com/SerenityOS/serenity/issues/7657).
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### Boot fails with "Error: Kernel Image too big for memory slot. Halting!"
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This means the kernel is too large again. Contact us on the discord server or open a GitHub Issue about it.
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You might want to revert latest changes in tree to see if that solves the problem temporarily.
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### Boot fails with "Your computer does not support long mode (64-bit mode). Halting!"
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Either your machine (if you try to boot on bare metal) is very old, thus it's not supporting x86_64
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extensions, or you try to use VirtualBox without using a x64 virtualization mode or you try to use
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`qemu-system-i386` which doesn't support x86_64 extensions too.
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### Boot fails with "Your computer does not support PAE. Halting!"
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- If booting on bare metal, your CPU is too old to boot Serenity.
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- If you're using VirtualBox, you need to enable PAE/NX. Check the instructions [here.](VirtualBox.md)
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- If you're using QEMU, the [CPU model configuration](https://qemu-project.gitlab.io/qemu/system/qemu-cpu-models.html) is not exposing PAE.
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