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Documentation: Reorganize the build documentation

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Gunnar Beutner 2021-07-10 00:53:28 +02:00 • committed by Gunnar Beutner
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37
Documentation/Troubleshooting.md
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In case of an error, you might find an answer of how to deal it here.
## I build everything, the VM starts and then I see...
## Building SerenityOS
### "Error: Kernel Image too big for memory slot. Halting!"
### CMake fails to configure the build because it's outdated
Ensure your CMake version is >= 3.16 with `cmake --version`. If your system doesn't provide a suitable
version of CMake, you can download a binary release from the [CMake website](https://cmake.org/download).
### QEMU is missing or is outdated
Ensure your [QEMU](https://www.qemu.org/) version is >= 5 with `qemu-system-i386 -version`. Otherwise,
install it. You can also build it using the `Toolchain/BuildQemu.sh` script.
### GCC is missing or is outdated
Ensure your gcc version is >= 10 with `gcc --version`. Otherwise, install it. If your gcc binary is not
called `gcc` you have to specify the names of your C and C++ compiler when you run cmake, e.g.
`cmake ../.. -GNinja -DCMAKE_C_COMPILER=gcc-11 -DCMAKE_CXX_COMPILER=g++-11`.
## Running SerenityOS
### The VM is really slow
On Linux, QEMU is significantly faster if it's able to use KVM. The run script will automatically enable KVM
if `/dev/kvm` exists and is readable+writable by the current user. On Windows, ensure that you have
WHPX acceleration enabled.
### Boot fails with "Error: Kernel Image too big for memory slot. Halting!"
This means the kernel is too large again. Contact us on the discord server or open a GitHub Issue about it.
You might want to revert latest changes in tree to see if that solves the problem temporarily.
### "Your computer does not support long mode (64-bit mode). Halting!"
### Boot fails with "Your computer does not support long mode (64-bit mode). Halting!"
Either your machine (if you try to boot on bare metal) is very old, thus it's not supporting x86_64 extensions, or you try to use VirtualBox without using a x64 virtualization mode or you try to use `qemu-system-i386` which doesn't support x86_64 extensions too.
Either your machine (if you try to boot on bare metal) is very old, thus it's not supporting x86_64
extensions, or you try to use VirtualBox without using a x64 virtualization mode or you try to use
`qemu-system-i386` which doesn't support x86_64 extensions too.
### Boot fails with "Your computer does not support PAE. Halting!"
### "Your computer does not support PAE. Halting!"
- If booting on bare metal, your CPU is too old to boot Serenity.
- If you're using VirtualBox, you need to enable PAE/NX. Check the instructions [here.](VirtualBox.md)
- If you're using QEMU, the [CPU model configuration](https://qemu-project.gitlab.io/qemu/system/qemu-cpu-models.html) is not exposing PAE.