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133 lines
4.4 KiB
Markdown
133 lines
4.4 KiB
Markdown
# Running Serenity on Raspberry Pi
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## NOTE
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This is for development purposes only - Serenity doesn't currently boot on Raspberry Pi! Use this guide if you want to set up a development environment.
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Currently only UART output is supported, no display.
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64-bit only, so you need a Raspberry Pi 3 or newer.
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## Running in QEMU
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### Step 1: Set Up Serenity
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Please follow [build instructions](BuildInstructions.md) to download and build Serenity. Make sure everything builds successfully for x86.
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### Step 2: Build Aarch64 toolchain
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Use following the command to build the toolchain for Aarch64:
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```console
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Meta/serenity.sh rebuild-toolchain aarch64
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```
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### Step 3: Build and run in emulator
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Use the following command to build and run the Aarch64 kernel:
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```console
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Meta/serenity.sh run aarch64
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```
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It should build Serenity and open a QEMU window, similar to the x86 version. You should see some messages in the terminal.
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You can also run it under gdb with:
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```console
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Meta/serenity.sh gdb aarch64
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```
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## Running on real hardware using an SD Card
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### Step 0: Download and run Raspberry Pi OS from an SD Card
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This step is needed because the original firmware files need to be present on the SD Card when booting Serenity. It will also help with the UART setup.
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### Step 1: Connect your Raspberry Pi to your PC using a UART cable
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Please follow one of the existing guides (for example [here](https://scribles.net/setting-up-serial-communication-between-raspberry-pi-and-pc)) and make sure UART is working on Raspberry Pi OS before proceeding.
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### Step 2: Mount SD Card
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If you use a Raspberry Pi 4, and your serenity kernel is called `kernel8.img`
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(the default), and you don't have any other `kernel*.img` files on your SD
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card, make sure `config.txt` is empty.
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If you want to use filename that isn't `kernel8.img` or if you want to keep
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other `kernel*.img` files on your SD card, put this in config.txt:
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```
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arm_64bit=1
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kernel=myfilename.img
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```
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If you use a Raspberry Pi 3, put this in config.txt:
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```
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enable_uart=1
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```
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### Step 3: Copy Serenity kernel to SD Card
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`kernel8.img` can be found in `Build/aarch64/Kernel/Prekernel/`. Copy it to the main directory on the `Boot/` partition, next to `config.txt`. You can either replace the original file or use another name (see above).
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### Step 4: Put the SD Card in the Raspberry Pi and power on
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You should start seeing some messages in your UART terminal window.
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## Running on real hardware using network (Raspberry Pi 3)
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### Prerequisites
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There are multiple ways to set up your network. The easiest way is a direct connection between the Raspberry Pi and your PC. To achieve this your PC has to have an Ethernet port.
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Here's the [Raspberry Pi Documentation](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#debugging-network-boot-mode) on booting from the network.
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### Step 1: Make sure OTP mode is enabled on the board
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This is enabled by default on Raspberry Pi 3+. For the previous boards please see the section [Debugging Network Boot Mode](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#debugging-network-boot-mode) of the Raspberry Pi documentation.
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### Step 2: Copy all files from the original SD Card to your PC
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This directory will serve as a TFTP server, sending files to the Raspberry Pi when requested.
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### Step 2: Set up the network interface
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Switch the network interface to static mode (static IP) and disable the firewall.
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### Step 3: Set up network services
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Booting Raspberry Pi requires DHCP and TFTP servers.
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On Windows, you can use the [Tftpd32](https://bitbucket.org/phjounin/tftpd64/src/master/) program.
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Example configuration for DHCP:
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Make sure you **disable** the `Ping address before assignment` option.
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Example configuration for TFTP:
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The only option worth noting is `Base Directory` which should contain the files from the SD Card.
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### Step 4: Power up the Raspberry Pi
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Remove the SD Card, connect an Ethernet cable between the Raspberry Pi and your PC and power on the board.
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After 5-10 seconds you should see files being served by the TFTP server:
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The system should boot normally as it would from the SD Card.
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### Step 5: Modify config.txt and copy Serenity kernel
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Similarly to booting from SD Card (see above), modify `config.txt` and copy the Serenity kernel to the TFTP directory.
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### Step 6: Reset Raspberry Pi
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You should start seeing some Serenity messages in your UART terminal window.
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