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Raspberry Pi

BSP Layer documentation

Yoe supports the following Raspberry Pi projects:

ProjectBoardArchitecture
rpi4-32Raspberry Pi 432-bit ARM
rpi4-64Raspberry Pi 464-bit ARM
rpi5Raspberry Pi 564-bit ARM

Raspberry Pi 5

The Raspberry Pi 5 is the latest generation featuring a Broadcom BCM2712 SoC with quad Cortex-A76 cores at 2.4 GHz, VideoCore VII GPU, and 4 or 8 GB LPDDR4X RAM. It adds a PCIe 2.0 x1 connector (for NVMe HATs), dual 4Kp60 HDMI output, and a dedicated UART connector for the Raspberry Pi Debug Probe.

The Pi 5 requires a USB-C power supply capable of 5V/5A (25W) for full performance. A 5V/3A supply will work but may throttle under load.

Raspberry Pi 4

The Raspberry Pi 4 features a Broadcom BCM2711 SoC with quad Cortex-A72 cores at 1.8 GHz, up to 8 GB LPDDR4 RAM, dual micro-HDMI (4Kp60), Gigabit Ethernet, USB 3.0, and dual-band WiFi. Both 32-bit (rpi4-32) and 64-bit (rpi4-64) builds are supported.

Building/installing an image

  1. git clone https://github.com/YoeDistro/yoe-distro.git
  2. cd yoe-distro
  3. . ./envsetup.sh <project> (e.g., rpi4-64, rpi5)
  4. yoe_setup
  5. bitbake yoe-simple-image
  6. Insert SD card
  7. lsblk (note SD card device, and substitute for /dev/sdX below)
  8. yoe_install_image /dev/sdX yoe-simple-image (Note, Etcher can also be used to write images to SD cards).
  9. Optional: configure console for serial port (see below)
  10. sudo eject /dev/sdX
  11. Install SD card in the Raspberry Pi and enjoy your new image

Enable serial console

The serial console for the rPi3/4 can be enabled by adding ENABLE_UART = "1" to local.conf. This is currently done in local.conf, but has tradeoffs as described in the BSP layer documentation.

Connecting to the serial console

The Raspberry Pi serial console is available on the 40-pin expansion header. A USB-to-serial cable with flying leads is a convenient way to connect to this. FTDI (as well as many other companies) supply these cables. The below image shows how the FTDI cable is connected:

rPI serial console

The relevant signals are:

  • FTDI Black (GND) <-> rPI Pin 6 (GND)
  • FTDI Yellow (RXD) <- rPI Pin 8 (TXD)
  • FTDI Orange (TXD) -> rPI Pin 10 (RXD)

On the Raspberry Pi 5, you can also use the dedicated 3-pin UART connector with the official Raspberry Pi Debug Probe.

See the Raspberry Pi documentation for more information.

Power Supply

Some Raspberry Pi products are sensitive to power quality. It is recommended to use the official power supply for your model:

  • Pi 4: 5.1V/3A USB-C supply
  • Pi 5: 5V/5A (27W) USB-C supply for full performance

An inadequate supply may result in lockups or SD card file system corruption.

References