NXP Semiconductors

UM12262

FRDM-IMX91 Board User Manual

Figure 12. 5-inch Tianma LCD connection with FRDM-IMX91 through 2x20-pin EXPI connector

3.1.3 Software configuration update

The following steps specify how to replace the default dtb with the custom dtb (imx91-11x11-frdm-tianma-wvga-

panel.dtb) that supports Tianma LCD.

1. Stop at U-Boot

2. Use the below commands to replace the default dtb:

$setenv fdtfile imx91-11x11-frdm-tianma-wvga-panel.dtb

$saveenv

$boot

3.2 Other accessory boards

There are other accessory boards also that can work with FRDM-IMX91 through EXPI 2x20-pin interface, such

as 8MIC-RPI-MX8 and MX93AUD-HAT. To use any such board, check the schematic and layout to determine

the direction of the connection between FRDM-IMX91 and the accessory board in advance. Also, choose the

right dtb file in the U-Boot stage.

UM12262

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User manual

Rev. 3.0 — 22 April 2025

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