Generic OSD32MP1 Support

This is the base Nerves System configuration for the OSD32MP1-BRK

Feature	Description
CPU	up to 800 mHz ARM dual Cortex-A7
Memory	up to 1 GB DRAM
Storage	MicroSD card
Linux Kernel	5.4
IEx terminal	UART `ttySTM0`
GPIO, I2C, SPI	Yes - Elixir Circuits
ADC	Yes
PWM	Yes, but no Elixir support
UART	ttySTM0 + more via device tree overlay
Coprocessor	embedded M4 STM32
Camera	None
Ethernet	No
WiFi	Requires USB WiFi dongle
Bluetooth	No
Audio	No

WARNING

This system is still considered in alpha state, expect backwards incompatible changes to be made

Using

The most common way of using this Nerves System is create a project with mix nerves.new and to export MIX_TARGET=osd32mp1. See the Getting started guide for more information.

If you need custom modifications to this system for your device, clone this repository and update as described in Making custom systems.

Boot Jumpers

The boot jumpers on the OSD32MP1-BRK board should be set like this to boot from Micro SDCard. Orient the board so that the USB connector is to the right of the switch.

label
0		X
1	X
2		X
WP	X

Supported USB WiFi Devices

The base image includes drivers and firmware for Ralink RT53xx (rt2800usb driver) and RealTek RTL8712U (r8712u driver) devices.

We are still working out which subset of all possible WiFi dongles to support in our images. At some point, we may have the option to support all dongles and selectively install modules at packaging time, but until then, these drivers and their associated firmware blobs add significantly to Nerves release images.

If you are unsure what driver your WiFi dongle requires, run Debian and configure WiFi for your device. At a shell prompt, run lsmod to see which drivers are loaded. Running dmesg may also give a clue. When using dmesg, reinsert the USB dongle to generate new log messages if you don't see them.

Provisioning devices

This system supports storing provisioning information in a small key-value store outside of any filesystem. Provisioning is an optional step and reasonable defaults are provided if this is missing.

Provisioning information can be queried using the Nerves.Runtime KV store's Nerves.Runtime.KV.get/1 function.

Keys used by this system are:

Key	Example Value	Description
`nerves_serial_number`	`"12345678"`	By default, this string is used to create unique hostnames and Erlang node names.

The normal procedure would be to set these keys once in manufacturing or before deployment and then leave them alone.

For example, to provision a serial number on a running device, run the following and reboot:

iex> cmd("fw_setenv nerves_serial_number 12345678")

This system supports setting the serial number offline. To do this, set the NERVES_SERIAL_NUMBER environment variable when burning the firmware. If you're programming MicroSD cards using fwup, the commandline is:

sudo NERVES_SERIAL_NUMBER=12345678 fwup path_to_firmware.fw

Serial numbers are stored on the MicroSD card so if the MicroSD card is replaced, the serial number will need to be reprogrammed. The numbers are stored in a U-boot environment block. This is a special region that is separate from the application partition so reformatting the application partition will not lose the serial number or any other data stored in this block.