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Documentation: Add note about testing UART on the Raspberry Pi 4B

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Caoimhe 2023-05-26 13:55:24 +01:00 committed by Andrew Kaster
parent 0afdde0eef
commit b0eff23a46
Notes: sideshowbarker 2024-07-17 06:45:52 +09:00 
Author: https://github.com/caoimhebyrne
Commit: https://github.com/SerenityOS/serenity/commit/b0eff23a46
Pull-request: https://github.com/SerenityOS/serenity/pull/19058
Reviewed-by: https://github.com/BertalanD ✅
Reviewed-by: https://github.com/nico ✅
Reviewed-by: https://github.com/supercomputer7 ✅
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Documentation/RunningOnRaspberryPi.md
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@ -48,6 +48,13 @@ This step is needed because the original firmware files need to be present on th
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. 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.
If you're using a Raspberry Pi 4B and want to test if the UART is working correctly, you need to do a few extra steps.
UART0 (the one that SerenityOS uses) is used for bluetooth on these models, so for the OS to use it instead, ensure that you disable Bluetooth inside the `config.txt`:
```
dtoverlay=disable-bt
```
### Step 2: Mount SD Card ### Step 2: Mount SD Card
If you use a Raspberry Pi 4, and your serenity kernel is called `kernel8.img` If you use a Raspberry Pi 4, and your serenity kernel is called `kernel8.img`
@ -70,7 +77,7 @@ enable_uart=1
### Step 3: Copy Serenity kernel to SD Card ### Step 3: Copy Serenity kernel to SD Card
`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). `kernel8.img` can be found in `Build/aarch64/Kernel/`. 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).
### Step 4: Put the SD Card in the Raspberry Pi and power on ### Step 4: Put the SD Card in the Raspberry Pi and power on
@ -84,7 +91,7 @@ There are multiple ways to set up your network. The easiest way is a direct conn
Here's the [Raspberry Pi Documentation](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#debugging-network-boot-mode) on booting from the network. Here's the [Raspberry Pi Documentation](https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#debugging-network-boot-mode) on booting from the network.
### Step 1: Make sure OTP mode is enabled on the board ### Step 1: Make sure OTP mode is enabled on the board
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. 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.