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How to generate a image.ub with a custom DTB using petalinux

oscargomezf

Hi everyone,

 

I would like to generate an image.ub file with petalinux, but I need to include a custom dtb file.

 

Is there anyway to do that?

 

Brest regards.

  • 0

    I've tried to boot the kernel, device tree and rootfs from u-boot, but it doesn't work and I dont' know why.

    I've saved the uImage (Kernel), system.dtb (device tree) and uramdisk.image.gz(rootfs)  int the sd card, and then I've tried to boot directly with the following commands:

    U-Boot-PetaLinux> load mmc 0 0x3000000 uImage;
    reading uImage
    6121832 bytes read in 1087 ms (5.4 MiB/s)
     
    U-Boot-PetaLinux> load mmc 0 0x2A00000 system.dtb;
    reading system.dtb
    11540 bytes read in 18 ms (626 KiB/s)
     
    U-Boot-PetaLinux> load mmc 0 0x2000000 uramdisk.image.gz;
      reading uramdisk.image.gz
      803686 bytes read in 163 ms (4.7 MiB/s)
       
    But I've got the following error when I 've tried the bootm command:
     
    U-Boot-PetaLinux> bootm 0x3000000 0x2000000 0x2A00000;
      Wrong Image Format for bootm command
      ERROR: can't get kernel image!
       
      Could anyone help me? I don't why I've got this error.
       
      Best regards.
     
     
  • 0

    You could follow the instructions on pg. 23 of the Xilinx PetaLinux Tools Workflow Tutorial UG1156 (http://www.xilinx.com/support/documentation/sw_manuals/xilinx2016_2/ug1156-petalinux-tools-workflow-tutorial.pdf) to test booting your kernel and custom dtb with qemu.

    For building a PetaLinux image with your custom dtb you would need to replace the default dtb with your custom dtb in the
    subsystems/linux/configs/device-tree folder of your PetaLinux project and then rebuild the image.

     

    --Tom

  • 0 in reply to narrucmot

    Hi narrucmot,

     

    I'm trying to boot from mmc  or tftp (with the command tftp, instead of fatload mmc 0), but it didn't work. Do you know why?

    From mmc:

    U-Boot-PetaLinux> fatload mmc 0 0x3000000 uImage;
    reading uImage
    6121832 bytes read in 1087 ms (5.4 MiB/s)

     

    U-Boot-PetaLinux> fatload mmc 0 0x2A00000 system.dtb;
    reading system.dtb
    11540 bytes read in 18 ms (626 KiB/s)

     

    U-Boot-PetaLinux> fatload mmc 0 0x2000000 uramdisk.image.gz;
    reading uramdisk.image.gz
    803686 bytes read in 163 ms (4.7 MiB/s)

     

    But I've got the following error when I 've tried the bootm command:

    U-Boot-PetaLinux> bootm 0x3000000 0x2000000 0x2A00000;
    Wrong Image Format for bootm command
    ERROR: can't get kernel image!

    I made the uImage using the mkimage:

    mkimage -A arm -O linux -T kernel -C none -a 0x8000 -e 0x8000 -n "Linux kernel" -d zImage uImage

     

    Do you have any suggestion?

     

    Best regards.

  • 0 in reply to narrucmot

    Hi Tom,

     

    But I didn't find any dtb file in the folder: subsystems/linux/configs/device-tree

     

    Best regards.

  • 0 in reply to narrucmot

    Hi Tom,

     

    I've tried to copy my .dts file and overwrite the subsystems/linux/configs/device-tree/system-top.dts and now it works fine.

     

    Thank you very much. Best regards.