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Use distro cross-compilers in kernel build #1660

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Merged
merged 7 commits into from
Sep 10, 2020
Merged

Use distro cross-compilers in kernel build #1660

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65d6111
Use distro cross-compilers in kernel build
RyanHir Aug 30, 2020
a847e9a
Remove binutils requirment already as it is a dep for gcc-arm
RyanHir Sep 1, 2020
057580a
Remove zlib1g from instructions as mentioned in comments.
RyanHir Sep 1, 2020
d721932
Remove required packages as it is already in meta-package as rec
RyanHir Sep 3, 2020
d99e4e8
Revert "Remove required packages as it is already in meta-package as …
RyanHir Sep 3, 2020
a47d685
remove ccache instructions for when we were using the tools repo
RyanHir Sep 3, 2020
cf7739b
combine dependencies and toolchain install instructions
RyanHir Sep 3, 2020
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27 changes: 2 additions & 25 deletions linux/kernel/building.md
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Expand Up @@ -99,37 +99,14 @@ also a Debian distribution, it means many aspects are similar, such as the comma

You can either do this using VirtualBox (or VMWare) on Windows, or install it directly onto your computer. For reference, you can follow instructions online [at Wikihow](http://www.wikihow.com/Install-Ubuntu-on-VirtualBox).

### Install required dependencies
### Install required dependencies and toolchain

To build the sources for cross-compilation, make sure you have the dependencies needed on your machine by executing:
```bash
sudo apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev
sudo apt install git bc bison flex libssl-dev make libc6-dev libncurses5-dev crossbuild-essential-armhf
```
If you find you need other things, please submit a pull request to change the documentation.

### Install toolchain

Use the following command to download the toolchain to the home folder:

```bash
git clone https://github.com/raspberrypi/tools ~/tools
```

Updating the $PATH environment variable makes the system aware of file locations needed for cross-compilation.

```bash
echo PATH=\$PATH:~/tools/arm-bcm2708/arm-linux-gnueabihf/bin >> ~/.bashrc
source ~/.bashrc
```
If you are using a 32-bit operating system (for example, our Raspberry Pi Desktop for PC), then you may need to install an additional set of libraries:

`sudo apt install zlib1g-dev:amd64`

If you are using Ccache and a CI environment, instruct Ccache to not use the compiler's mtime for cache ID calculations.
This is because Git intentionally doesn't save file timestamps, so each time you clone the toolchain its file mtimes are different, invalidating Ccache's cache when default settings are used.

`ccache --set-config=compiler_check=content`

### Get sources

To download the minimal source tree for the current branch, run:
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