# Set up a Raspberry Pi 5 as an AWS IoT Greengrass core device

## In this learning path

- [Introduction](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/)
- [Understand AWS IoT Greengrass and Armv9 PAC/BTI security features](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/background/)
- [Set up a Raspberry Pi 5 as an AWS IoT Greengrass core device](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/prepare-rpi5/)
- [Set up a Jetson Thor as an AWS IoT Greengrass core device](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/prepare-jetson-thor/)
- [Create an AWS IoT Greengrass custom component](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/custom-component/)
- [Deploy the AWS IoT Greengrass custom component](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/deployment/)
- [Verify PAC/BTI support on your devices using MQTT](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/pacbti-testing/)
- [Next Steps](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/_next-steps/)

## Configure a Raspberry Pi 5 as a negative comparison platform
In this section, you’ll prepare a Raspberry Pi 5 (RPi5) device to become an AWS IoT Greengrass core device. The RPi5 uses a Cortex-A76 processor, which is Armv8.2-A. Because PAC requires Armv8.3-A and BTI requires Armv8.5-A, the RPi5 does not support either feature. The device serves as the negative comparison platform in this test.

### Install Raspberry Pi OS
Install the latest Raspberry Pi OS on your RPi. For instructions, see the [Getting started - Raspberry Pi documentation](https://www.raspberrypi.com/documentation/computers/getting-started.html).

### Install Java
Open a terminal on your RPi and run:
```bash
sudo apt update
sudo apt -y dist-upgrade
sudo apt install -y default-jdk
```
Confirm that Java is available:
```bash
java --version
```
The output is similar to:
```
__output__openjdk 21.0.10 2026-01-20
__output__OpenJDK Runtime Environment (build 21.0.10+7-Debian-1deb13u1)
__output__OpenJDK 64-Bit Server VM (build 21.0.10+7-Debian-1deb13u1, mixed mode, sharing)
```

### Install AWS IoT Greengrass
Before you complete these steps, create an AWS access key pair for the account you’ll use. You can follow the [AWS IoT Greengrass](https://learn.arm.com/install-guides/aws-greengrass-v2/) install guide or ask your AWS administrator.

To install AWS IoT Greengrass:
1. Open the AWS Console and go to **IoT Core** > **Greengrass devices** > **Core devices**.
2. Select **Set up core device** > **Set up one core device**.
3. Enter a name for your core device.
4. For **Thing group**, select **Enter a new group name**. Use `My_PAC_BTI_Test_Devices` as the **Thing group name**. Save the name because you’ll reuse this group for your Armv9 device in the next section.
5. For **Greengrass Core software runtime**, select **Greengrass nucleus** for installation.
6. For **Operating system**, select **Linux**.

![Greengrass core device setup — Linux and installer selection](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/images/greengrass-1.png)
*Greengrass core device setup — Linux and installer selection*

7. For **Device setup method**, select **Set up a device by downloading and running an installer locally on device**.
8. Follow the generated installer instructions on the RPi5 and authenticate with the AWS credentials that you created.

![Generated installer commands for the RPi5](https://learn.arm.com/learning-paths/cross-platform/aws-greengrass-pacbti-test/images/greengrass-2.webp)
*Generated installer commands for the RPi5*

9. Confirm registration by selecting **View core devices**. You should see your RPi5 listed with recent activity.

## What you’ve accomplished and what’s next
You’ve now set up your RPi5 device as an AWS IoT Greengrass core device as the negative comparison platform for PAC/BTI tests.

Next, you will set up your Armv9 PAC/BTI positive test platform.