Custom device tree for Toradex Easy Installer

Technical Support
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1

Hello,

We would like to use Toradex Easy Installer to update the operating system in the field, by using a memory stick. The update works well, but the colors on the screen are wrong during the update. We are using a 800x480 RGB LCD with 24 bits. Therefore, I made a customized boot script with the following additional line:

setenv bootargs console=ttymxc0,115200 quiet video=mxcfb0:dev=lcd,800x480M@60,if=RGB24,bpp=32 fbmem=8M rootfstype=squashfs root=/dev/ram autoinstall fullscreen ${teziargs}

Even with this parameter, the colors are wrong. I assume, that the device tree of the TEZI image is made for 18bit displays, since 18bit is the standard for Colibri modules. Is it possible, to use a customized device tree for the TEZI image, so that we can use it with 24bit displays?

Best regards,
Fabian

2

You can unpack the FIT image and replace the device tree in it. You need to have U-Boot utilities, hence make sure to have a U-Boot build tree ready. Then you can unpack the FIT image using this commands:

./tools/dumpimage -T flat_dt -i tezi.itb -p 0 zImage
./tools/dumpimage -T flat_dt -i tezi.itb -p 1 tezi-run-colibri-imx6.squashfs
./tools/dumpimage -T flat_dt -i tezi.itb -p 2 zImage-imx6dl-colibri-eval-v3.dtb

Instead of zImage-imx6dl-colibri-eval-v3.dtb use the customized device tree for your Linux image, then repack using the tezi.its file for Colibri iMX6.

./tools/mkimage -f tezi.its tezi-new.itb

Make sure you use a customized device tree which matches the kernel version used by the Toradex Easy Installer (see linux-toradex_4.1-2.0.x.bbappend).