Unable to read device tree blob

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Unable to read device tree blob

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aliismail
Contributor IV


I did a core-image-minimal build for the SCM quick start board. I attempted to write the kernel, rootfs, and bootloader to an SD card using the instructions in the i.MX_Linux_User's_Guide. The bootloader seems to load fine and looks like it is able to find the kernel, however, it is not able to find the .dtb. I get the following error:

Normal Boot

Hit any key to stop autoboot:  0

switch to partitions #0, OK

mmc1 is current device

reading boot.scr

** Unable to read file boot.scr **

reading zImage

6041144 bytes read in 293 ms (19.7 MiB/s)

Booting from mmc ...

reading imx6dqscm-1gb-qwks-rev2-fix-ldo.dtb

** Unable to read file imx6dqscm-1gb-qwks-rev2-fix-ldo.dtb **

Kernel image @ 0x12000000 [ 0x000000 - 0x5c2e38 ]

No gpc device node -9, force to ldo-enable.

Is the issue that the .dtb is not in the location the bootloader is looking for?

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aliismail
Contributor IV

So I found an answer to my problem. An sdcard image can be generated by adding the following to the local.conf file:

IMAGE_FSTYPES="ext3 tar.bz2 sdcard"

This gave me the sdcard image I was looking for.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ali

one can try Mfg Tool (it also has core-image-minimal image)

Updates and Patches (2)

SCM-i.MX 6Dual/6Quad Manufacturing Toolkit for Linux 3.14.52 Patch Release (REV 1)

http://www.nxp.com/products/single-chip-modules/quick-start-board-for-scm-i.mx-6dq:QWKS-SCM-IMX6DQ?f...

please use documentation and linux L3.14.52 on

http://www.nxp.com/products/single-chip-modules/quick-start-board-for-scm-i.mx-6dq:QWKS-SCM-IMX6DQ?f...

http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx?h=imx_3.14.52_1.1...

Best regards

igor

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aliismail
Contributor IV

Hi Igor,

After installing the mfg tool and modifying the scripts for the SCM board, the tool fails on the following command:

UTP: received command '$ mkfs.vfat /dev/mmcblk1p1'

UTP: executing "mkfs.vfat /dev/mmcblk1p1"

mkfs.vfat 2.11 (12 Mar 2005)

/dev/mmcblk1p1: No such file or directory

UTP: sending Non-success to kernel for command $ mkfs.vfat /dev/mmcblk1p1.

utp_poll: exit with status 256

It is trying to format a partition that was created earlier by the tool, however it looks like the OS does not recognize the partition on the SD card.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Ali

could you try fresh SD (not partitioned before), also is mfg tool working

without script modifications? As there is special mfg tool for SCM:

SCM-i.MX 6Dual/6Quad Manufacturing Toolkit for Linux 3.14.52 Patch Release:

Updates and Patches (2)

http://www.nxp.com/products/single-chip-modules/quick-start-board-for-scm-i.mx-6dq:QWKS-SCM-IMX6DQ?f...

Best regards

igor

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aliismail
Contributor IV

Yes, that is the exact tool I am using. I modified the cfg.ini as the following:

[profiles]

chip = Linux

[platform]

board = QWKS-rev2

[LIST]

name = SCM-SDCard

[variable]

initramfs = fsl-image-mfgtool-initramfs-imx_mfgtools.cpio.gz.u-boot

board = qwks-rev2

memsize = 1gb

mmc = 0

mem-mode = -fix-

ldo = ldo

I continue to get an error that a partition cannot be made on the SD. I have tried many SD cards and have re-formatted them. I am not sure if my cfg.ini is incorrect or the dip switches are incorrect.

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igorpadykov
NXP TechSupport
NXP TechSupport

could you try *.vbs files, without any changes :

mfgtool2-yocto-mx6scm-1gb-qwks-rev1-sdcard-bottom.vbs,

mfgtool2-yocto-mx6scm-1gb-qwks-rev1-sdcard-top.vbs

~igor

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aliismail
Contributor IV

Hi igor,

I wiped clean my SD card and took a look at what the scripts were doing. When mmc is 2, then the image gets written and works fine. When mmc is 1, then it errors out. I think since it worked for mmc = 2, then it should be fine right? The image was written onto the SD and runs. So it looks like the *-botton.vbs script works and not the other.

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aliismail
Contributor IV

Also, I tried using the kernel that I built using the fml-community environment and I get "UTP: Waiting for device to appear". I am not sure if my kernel is defective or if I need to convert the binary file into something else.

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igorpadykov
NXP TechSupport
NXP TechSupport

I am afraid communities releases may not work with scm,

suggest to use linux and tools from official scm product web page, links

were given on first answer.

~igor

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