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[skip ci] Add instructions for local build

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Fabian Mastenbroek 2020-08-10 16:32:29 +02:00
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@ -37,6 +37,49 @@ by updating `/etc/apparmor/parser.conf` as follows:
features-file=/usr/share/apparmor-features/features.stock
```
## Building manually
You may also choose to manually build one of these kernels yourself.
#### Prerequisites
Make sure you have at least 30GB of free space available and have the following
packages installed:
```bash
apt install devscripts asciidoc-base automake bc bison cpio dh-python flex git kmod libdw-dev libelf-dev libiberty-dev libnuma-dev libpve-common-perl libslang2-dev libssl-dev libtool lintian lz4 perl-modules python2-minimal rsync sed sphinx-common tar xmlto zlib1g-dev dwarves
```
In case you are building a kernel version >= 5.8, make sure you have installed at least [dwarves >= 1.16.0](https://packages.debian.org/bullseye/dwarves).
#### Obtaining the source
```bash
git clone https://github.com/fabianishere/pve-edge-kernel
cd pve-ede-kernel
git submodule update --init --recursive --depth 1
```
Afterwards, select the branch of your likings (e.g. `v5.8.x`).
#### Building
Invoking the following command will build the kernel and its associated packages:
```bash
make
```
The Makefile provides several environmental variables to control:
1. `PVE_BUILD_FLAVOR`
The name of the kernel flavor which represents a selection of kernel
functionality (e.g. [hardened](https://github.com/anthraxx/linux-hardened) or [zen](https://github.com/zen-kernel/zen-kernel)).
This name is part of the kernel version and package name, which means that you
can have multiple flavors of the same kernel installed alongside each other.
2. `PVE_BUILD_TYPE` (default `generic`)
The name of the kernel build type which represents the compilation options of
the kernel (e.g. optimization level or micro architecture).
This name is appended as suffix to the Debian package version in case it is not
the default value.
3. `PVE_BUILD_CC`
The compiler to use for the kernel build.
4. `PVE_BUILD_CFLAGS`
The compilation options to use for the kernel build. Use this variable to specify
the optimization level or micro architecture to build for.
## Questions
If you have any questions or want to see additional versions, flavors or micro architectures being built, feel
free to open an issue on Github.