IMX8MM - device tree overlay - unable to load .dtb and .dtbo in uboot

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IMX8MM - device tree overlay - unable to load .dtb and .dtbo in uboot

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Gourav
Contributor I

overlay - unable to load .dtb and .dtbo

 

I am using iMx8mm board and I have created .dtbo(device tree blob overlay ) file and copied it in /lib/firmware and .dtb (deivce tree blob ) file boot partition when I am doing load of .dtb and .dtbo file it giving error like

** Reading file would overwrite reserved memory **

I have attached screenshot of u-boot . Please guide what's my mistake here ,

 

 

I am following this process to load .dtbo and .dtb which is avialable at uboot/uboot_version/git/doc/README.fdt-overlays

Manually Loading and Applying Overlays
--------------------------------------

1. Figure out where to place both the base device tree blob and the
overlay. Make sure you have enough space to grow the base tree without
overlapping anything.

=> setenv fdtaddr 0x87f00000
=> setenv fdtovaddr 0x87fc0000

2. Load the base blob and overlay blobs

=> load ${devtype} ${bootpart} ${fdtaddr} ${bootdir}/base.dtb
=> load ${devtype} ${bootpart} ${fdtovaddr} ${bootdir}/overlay.dtb

3. Set it as the working fdt tree.

=> fdtaddr $fdtaddr

4. Grow it enough so it can 'fit' all the applied overlays

=> fdt resize 8192

5. You are now ready to apply the overlay.

=> fdt apply $fdtovaddr

6. Boot system like you would do with a traditional dtb.

For bootm:

=> bootm ${kerneladdr} - ${fdtaddr}

For bootz:

=> bootz ${kerneladdr} - ${fdtaddr}

Please note that in case of an error, both the base and overlays are going
to be invalidated, so keep copies to avoid reloading.ubootuboot

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3 Replies

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r_trivedi123
Contributor IV

Hi @Gourav,

We have achieved DTBO implementation on imx8mm with kirkstone build at Silicon Signals Pvt. Ltd.
Connect in case of discussion at info@siliconsignals.io

--
Rutvij Trivedi

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Chavira
NXP TechSupport
NXP TechSupport

Thank you for contacting NXP support!

Sorry, we don't have any examples for Device Tree Overlays.

You can follow the U-boot documentation:

Device Tree Overlays — Das U-Boot unknown version documentation


We normally use the command fatls mmc x:x to obtain a list of the dtb files available and change it with the next commands

u-boot=> setenv fdtfile <name>.dtb                      
u-boot=> saveenv

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Chavira
NXP TechSupport
NXP TechSupport

Chavira_0-1678988700837.png

 

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