i.MX ProcessorsのトピックDevice Tree file

Device Tree file

VinithNama — Mon, 14 Jun 2021 08:54:02 GMT

Hi Sir/Madam,

I'm working on imx8m mini EVK on Linux environment, I'm modifying the imx8mm-evk .dts file in the kernel-source/aarch/arm64/boot/dts/freescale location after modifying the file I'm building the dts file using bitbake –c menuconfig linux-imx after building the dts file, I'm generating the images using bitbake imx-image-full and copying the images to the sdcard when i'm booting the evk with this sdcard I'm unable to see the pin what i have modified in dts file.

Re: Device Tree file

igorpadykov — Mon, 14 Jun 2021 10:12:06 GMT

Hi Vinith

for dts customization one can look at tutorial

https://boundarydevices.com/mx6-device-tree-customization/

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-Yocto-Project-How-can-I-quickly-modify-the-kernel-and-test/ta-p/1129551

Best regards
igor

Re: Device Tree file

VinithNama — Mon, 14 Jun 2021 10:58:28 GMT

I have modified the device tree and added the dtb file in the u-boot time and booted the EVK board, when I'm exporting the gpio pins and checking the voltage levels using multimeter I'm unable to find the difference I have used Imx8m mini evk and the pin number is MX8MM_IOMUXC_SAI5_RXD1_GPIO3_IO22 0x19 and I have enable the sai5 group in dts file.

Re: Device Tree file

r_trivedi123 — Tue, 05 Dec 2023 14:43:47 GMT

Hi @VinithNama ,

you can check either of any
1. DTBO is implemented which is overwriting your dts configuration
2. Check the md5sum of the actual generated dtb vs on board dtb
3. In U-boot check weather the dtbo is actually being taken into account while booting kernel using printenv command
4. Perhaps the same GPIO is being configured alternatively, the final config can be checked post booting /sys/kernel/debug/gpio ?

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Rutvij Trivedi
Silicon Signals Pvt. Ltd.
info@siliconsignals.io

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Rutvij Trivedi