FRDM-IMX91

Overview

The FRDM-IMX91 board is a low-cost and compact platform designed to show the most commonly used features of the i.MX 91 Applications Processor in a small and low cost package. The FRDM-IMX93 board is an entry-level development board, which helps developers to get familiar with the processor before investing a large amount of resources in more specific designs.

Hardware

  • i.MX 91 applications processor

    • The i.MX 91 Applications Processor features an Arm Cortex®-A55 core that can operate at speeds of up to 1.4 GHz.

  • RAM: 2GB LPDDR4

  • Storage:

    • SanDisk 16GB eMMC5.1

    • microSD Socket

  • Wireless:

    • Murata Type-2EL (SDIO+UART+SPI) module. It is based on NXP IW612 SoC, which supports dual-band (2.4 GHz /5 GHz) 1x1 Wi-Fi 6, Bluetooth 5.2, and 802.15.4

  • USB:

    • Two USB 2.0 Type C connectors

  • Ethernet:

    • ENET: 10/100/1000 Mbit/s RGMII Ethernet connected with external PHY YT8521

    • ENET_QoS: 10/100/1000 Mbit/s RGMII Ethernet supporting TSN connected with external PHY YT8521

  • PCIe:

    • One M.2/NGFF Key E mini card 75-pin connector

  • Connectors:

    • 40-Pin Dual Row Header

  • LEDs:

    • 1x Power status LED

    • 2x UART LED

  • Debug:

    • JTAG 20-pin connector

    • MicroUSB for UART debug

Supported Features

The frdm_imx91 board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

frdm_imx91/mimx9131 target

Type

Location

Description

Compatible

CPU

on-chip

ARM Cortex-A55 CPU1

arm,cortex-a55

Clock control

on-chip

i.MX CCM Rev2 (Clock Controller Module) IP node1

nxp,imx-ccm-rev2

Counter

on-chip

NXP Timer/PWM Module (TPM) used as timer1 5

nxp,tpm-timer

GPIO & Headers

on-chip

i.MX RGPIO4

nxp,imx-rgpio

I2C

on-chip

NXP LPI2C controller8

nxp,lpi2c

Interrupt controller

on-chip

ARM Generic Interrupt Controller v31

arm,gic-v3

Pin control

on-chip

This compatible binding should be applied to the device’s iomuxc DTS node1

nxp,imx-iomuxc

on-chip

The node has the ‘pinctrl’ node label set in MCUX SoC’s devicetree1

nxp,imx93-pinctrl

Power management CPU operations

on-chip

Power State Coordination Interface (PSCI) version 1.11

arm,psci-1.1

Serial controller

on-chip

NXP LPUART1 1

nxp,lpuart

Timer

on-chip

per-core ARM architected timer1

arm,armv8-timer

Devices

System Clock

This board configuration uses a system clock frequency of 24 MHz. Cortex-A55 Core runs up to 1.4 GHz.

Serial Port

This board configuration uses a single serial communication channel with the CPU’s UART1 for A55 core.

Programming and Debugging

U-Boot “go” command is used to load and kick Zephyr to Cortex-A55 Core.

Stop the board at U-Boot command line, then need to download Zephyr binary image into DDR memory, it can use tftp:

tftp 0x80000000 zephyr.bin

Or copy the Zephyr image zephyr.bin to SD card and plug the card into the board, for example if copy the image to the FAT partition of the SD card, use the following U-Boot command to load the image into DDR memory (assuming the SD card is dev 1, fat partition ID is 1, they could be changed based on actual partitions):

fatload mmc 1:1 0x80000000 zephyr.bin;

Then use U-Boot to load and kick zephyr.bin to Cortex-A55 Core:

dcache off; icache flush; go 0x80000000

Use this configuration to run basic Zephyr applications and kernel tests, for example, with the Basic Synchronization sample:

# From the root of the zephyr repository
west build -b frdm_imx91/mimx9131 samples/synchronization

This will build an image with the synchronization sample app, boot it and display the following console output:

*** Booting Zephyr OS build v4.2.0-4272-g1cbd317fd85e ***
thread_a: Hello World from cpu 0 on frdm_imx91!
thread_b: Hello World from cpu 0 on frdm_imx91!
thread_a: Hello World from cpu 0 on frdm_imx91!
thread_b: Hello World from cpu 0 on frdm_imx91!

Support Resources for Zephyr