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boards: nxp: add support for platform FRDM-IMX91
Added FRDM-IMX91 board support. Building hello_world: west build -p always -b frdm_imx91/mimx9131 samples/hello_world Signed-off-by: Hongbo Wang <[email protected]> Signed-off-by: Jiafei Pan <[email protected]>
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‎boards/nxp/frdm_imx91/Kconfig.frdm_imx91‎

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# Copyright 2025 NXP
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_FRDM_IMX91
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select SOC_MIMX9131
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select SOC_PART_NUMBER_MIMX9131CVVXJ

‎boards/nxp/frdm_imx91/board.yml‎

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board:
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name: frdm_imx91
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full_name: FRDM-IMX91
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vendor: nxp
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socs:
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- name: mimx9131

‎boards/nxp/frdm_imx91/doc/index.rst‎

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.. zephyr:board:: frdm_imx91
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Overview
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********
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The FRDM-IMX91 board is a low-cost and compact platform designed to show
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the most commonly used features of the i.MX 91 Applications Processor in a
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small and low cost package. The FRDM-IMX93 board is an entry-level development
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board, which helps developers to get familiar with the processor before
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investing a large amount of resources in more specific designs.
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Hardware
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********
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- i.MX 91 applications processor
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- The i.MX 91 Applications Processor features an Arm Cortex®-A55 core
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that can operate at speeds of up to 1.4 GHz.
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- RAM: 2GB LPDDR4
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- Storage:
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- SanDisk 16GB eMMC5.1
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- microSD Socket
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- Wireless:
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- Murata Type-2EL (SDIO+UART+SPI) module. It is based on NXP IW612 SoC,
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which supports dual-band (2.4 GHz /5 GHz) 1x1 Wi-Fi 6, Bluetooth 5.2,
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and 802.15.4
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- USB:
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- Two USB 2.0 Type C connectors
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- Ethernet:
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- ENET: 10/100/1000 Mbit/s RGMII Ethernet connected with external PHY
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YT8521
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- ENET_QoS: 10/100/1000 Mbit/s RGMII Ethernet supporting TSN connected
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with external PHY YT8521
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- PCIe:
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- One M.2/NGFF Key E mini card 75-pin connector
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- Connectors:
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- 40-Pin Dual Row Header
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- LEDs:
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- 1x Power status LED
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- 2x UART LED
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- Debug:
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- JTAG 20-pin connector
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- MicroUSB for UART debug
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Supported Features
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==================
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.. zephyr:board-supported-hw::
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Devices
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========
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System Clock
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------------
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This board configuration uses a system clock frequency of 24 MHz.
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Cortex-A55 Core runs up to 1.4 GHz.
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Serial Port
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-----------
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This board configuration uses a single serial communication channel with the
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CPU's UART1 for A55 core.
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Programming and Debugging
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*************************
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U-Boot "go" command is used to load and kick Zephyr to Cortex-A55 Core.
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Stop the board at U-Boot command line, then need to download Zephyr binary image into
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DDR memory, it can use tftp:
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.. code-block:: console
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tftp 0x80000000 zephyr.bin
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Or copy the Zephyr image ``zephyr.bin`` to SD card and plug the card into the board, for example
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if copy the image to the FAT partition of the SD card, use the following U-Boot command to load
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the image into DDR memory (assuming the SD card is dev 1, fat partition ID is 1, they could be
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changed based on actual partitions):
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.. code-block:: console
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fatload mmc 1:1 0x80000000 zephyr.bin;
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Then use U-Boot to load and kick zephyr.bin to Cortex-A55 Core:
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.. code-block:: console
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dcache off; icache flush; go 0x80000000
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Use this configuration to run basic Zephyr applications and kernel tests,
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for example, with the :zephyr:code-sample:`synchronization` sample:
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.. zephyr-app-commands::
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:zephyr-app: samples/synchronization
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:host-os: unix
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:board: frdm_imx91/mimx9131
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:goals: build
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This will build an image with the synchronization sample app, boot it and
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display the following console output:
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.. code-block:: console
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*** Booting Zephyr OS build v4.2.0-4272-g1cbd317fd85e ***
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thread_a: Hello World from cpu 0 on frdm_imx91!
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thread_b: Hello World from cpu 0 on frdm_imx91!
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thread_a: Hello World from cpu 0 on frdm_imx91!
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thread_b: Hello World from cpu 0 on frdm_imx91!
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.. include:: ../../common/board-footer.rst
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:start-after: nxp-board-footer

‎boards/nxp/frdm_imx91/frdm_imx91-pinctrl.dtsi‎

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/*
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* Copyright 2025 NXP
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* SPDX-License-Identifier: Apache-2.0
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*
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*/
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#include <nxp/nxp_imx/mimx9131cvvxj-pinctrl.dtsi>
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&pinctrl {
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uart1_default: uart1_default {
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group0 {
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pinmux = <&iomuxc1_uart1_rxd_lpuart_rx_lpuart1_rx>,
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<&iomuxc1_uart1_txd_lpuart_tx_lpuart1_tx>;
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bias-pull-up;
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slew-rate = "slightly_fast";
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drive-strength = "x5";
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};
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};
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uart2_default: uart2_default {
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group0 {
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pinmux = <&iomuxc1_uart2_rxd_lpuart_rx_lpuart2_rx>,
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<&iomuxc1_uart2_txd_lpuart_tx_lpuart2_tx>;
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bias-pull-up;
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slew-rate = "slightly_fast";
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drive-strength = "x5";
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};
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};
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};

‎boards/nxp/frdm_imx91/frdm_imx91_mimx9131.dts‎

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/*
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* Copyright 2025 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/dts-v1/;
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#include <nxp/nxp_mimx91.dtsi>
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#include "frdm_imx91-pinctrl.dtsi"
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/ {
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model = "NXP FRDM-IMX91 A55";
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compatible = "fsl,mimx91";
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chosen {
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zephyr,console = &lpuart1;
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zephyr,shell-uart = &lpuart1;
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zephyr,sram = &dram;
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};
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dram: memory@80000000 {
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reg = <0x80000000 DT_SIZE_M(1)>;
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};
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};
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&lpuart1 {
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart1_default>;
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pinctrl-names = "default";
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};

‎boards/nxp/frdm_imx91/frdm_imx91_mimx9131.yaml‎

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#
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# Copyright 2025 NXP
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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identifier: frdm_imx91/mimx9131
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name: NXP FRDM-IMX91
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type: mcu
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arch: arm64
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toolchain:
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- zephyr
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- cross-compile
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ram: 1024
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supported:
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- uart
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vendor: nxp

‎boards/nxp/frdm_imx91/frdm_imx91_mimx9131_defconfig‎

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#
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# Copyright 2025 NXP
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#
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# SPDX-License-Identifier: Apache-2.0
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# ARM Options
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CONFIG_AARCH64_IMAGE_HEADER=y
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CONFIG_ARMV8_A_NS=y
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# MMU Options
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# Increase the value when encounter the assert on the MAX_XLAT_TABLES
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CONFIG_MAX_XLAT_TABLES=24
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# Cache Options
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CONFIG_CACHE_MANAGEMENT=y
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CONFIG_DCACHE_LINE_SIZE_DETECT=y
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CONFIG_ICACHE_LINE_SIZE_DETECT=y
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# Zephyr Kernel Configuration
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CONFIG_XIP=n
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# Serial Drivers
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CONFIG_SERIAL=y
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CONFIG_UART_INTERRUPT_DRIVEN=y
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# Enable Console
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CONFIG_CONSOLE=y
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CONFIG_UART_CONSOLE=y
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CONFIG_CLOCK_CONTROL=y

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