PINE64 Yuzuki Avaota-A1

chip:a527

Avaota-A1 is an ARM64 Single-Board Computer based on the Allwinner A527 SoC.

Features

**System on Chip:** Allwinner A527

:   -   **CPU:** Octa-Core ARM Cortex-A55
    -   **GPU:** ARM G57 MC1
    -   **Interrupt Controller:** ARM GIC-600 (Generic Interrupt
        Controller v3)

• RAM: 2GB or 4GB LPDDR4 SDRAM

• Internal Storage: 16GB or 32GB eMMC

• External Storage: MicroSD

• Ethernet: Dual Gigabit Ports

• Wireless: WiFi 6, Bluetooth 5.4

• I/O: UART, SPI, I2C, USB 3.0 OTG

Serial Console

A USB Serial Adapter (CH340 or CP2102) is required to run NuttX.

Connect the USB Serial Adapter to the Avaota-A1 Serial Console at:

USB Serial Avaota-A1 Pin

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GND Pin 6 (GND) RX Pin 8 (UART0 TX) TX Pin 10 (UART0 RX)

On the USB Serial Adapter, set the Voltage Level to 3V3.

Connect Avaota-A1 to our computer with the USB Serial Adapter. On our computer, start a Serial Terminal and connect to the USB Serial Port at 115.2 kbps:

 screen /dev/ttyUSB0 115200

NuttX will appear in the Serial Console when it boots.

ARM64 Toolchain

Before building NuttX, download the toolchain for xPack GNU AArch64 Embedded GCC (aarch64-none-elf).

Add the downloaded toolchain xpack-aarch64-none-elf-gcc-.../bin to the PATH Environment Variable.

Check the ARM64 Toolchain:

 aarch64-none-elf-gcc -v

Building

To build NuttX, [[in](`in.md)stall the prerequisites </quickstart/install>]{.title-ref} and [[clone the git repo](`clone the git repo.md)sitories </quickstart/install>]{.title-ref} for nuttx and apps.

Configure the NuttX project and build the project:

 cd nuttx
 tools/configure.sh avaota-a1:nsh
 make

This produces the NuttX Kernel nuttx.bin. Next, build the NuttX Apps Filesystem:

 make export
 pushd ../apps
 tools/mkimport.sh -z -x ../nuttx/nuttx-export-*.tar.gz
 make import
 popd
 genromfs -f initrd -d ../apps/bin -V "NuttXBootVol"

This generates the Initial RAM Disk initrd.

Package the NuttX Kernel and Initial RAM Disk into a NuttX Image:

 head -c 65536 /dev/zero >/tmp/nuttx.pad
 cat nuttx.bin /tmp/nuttx.pad initrd >Image

The NuttX Image Image will be copied to a microSD Card in the next step.

Booting

NuttX boots on PinePhone via a microSD Card. To prepare the microSD Card, download the AvaotaOS ImageAvaotaOS-...-noble-gnome-arm64-avaota-a1.img.xz from github.com/AvaotaSBC/AvaotaOS.

Write the downloaded image to a microSD Card with Balena Etcher.

Copy the file Image from the previous section and overwrite the file on the microSD Card.

Check that Avaota-A1 is connected to our computer via a USB Serial Adapter at 115.2 kbps:

 screen /dev/ttyUSB0 115200

Insert the microSD Card into Avaota-A1 and power up. NuttX boots and NuttShell (nsh) appears in the Serial Console.

To see the available commands in NuttShell:

 help

Configurations

nsh

Basic configuration that runs NuttShell (nsh). This configuration is focused on low level, command-line driver testing. Built-in applications are supported, but none are enabled. Serial Console is enabled on UART0 at 115.2 kbps.

Peripheral Support

NuttX for Avaota-A1 supports these peripherals:

Peripheral Support NOTES

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UART Yes