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installation/guides/arm-devices/platforms: updates to rpi docs #829

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23 changes: 8 additions & 15 deletions src/installation/guides/arm-devices/platforms.md
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# Supported Platforms

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## Raspberry Pi

Expand All @@ -18,11 +18,11 @@

### Supported Models

| Model | Architecture |
|---------------------------------------------|--------------|
| 1 A, 1 B, 1 A+, 1 B+, Zero, Zero W, Zero WH | armv6l |
| 2 B | armv7l |
| 3 B, 3 A+, 3 B+, Zero 2W, 4 B, 400, CM4, 5 | aarch64 |
| Model | Architecture |
|-------------------------------------------------------|--------------|
| 1 A, 1 B, 1 A+, 1 B+, Zero, Zero W, Zero WH | armv6l |
| 2 B | armv7l |
| 3 B, 3 A+, 3 B+, Zero 2W, 4 B, 400, CM4, 500, 5, CM5 | aarch64 |

> It is possible to run the armv7l images on an RPi 3, as the RPi 3's CPU
> supports both the Armv8 and Armv7 instruction sets. The difference between
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driver](../../../config/graphical-session/xorg.md#modesetting) or
[Wayland](../../../config/graphical-session/wayland.md).

You may also need to uncomment the `dtoverlay=vc4-kms-v3d` line in `/boot/config.txt`.

### Hardware

More configuration information can be found in the Raspberry Pi Foundation's
Expand All @@ -69,7 +71,7 @@

#### Audio

To enable the soundchip, add `dtparam=audio=on` to `/boot/config.txt`.
To enable audio, you may need to uncomment `dtparam=audio=on` in `/boot/config.txt`.

#### Serial

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$ i2cdetect -l
i2c-1i2c bcm2835 I2C adapter I2C adapter
```

### Memory cgroup

The kernel from the `rpi-kernel` package [disables the memory cgroup by
default](https://github.com/raspberrypi/linux/commit/28aec65bb1743c9bfa53b036999f9835c889704e).

This breaks workloads which use containers. Therefore, if you want to use
containers on your Raspberry Pi, you need to enable memory cgroups by adding
`cgroup_enable=memory` to `/boot/cmdline.txt`.
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