topic Re: 3.5.7 Kernel not booting in i.MX Processors

3.5.7 Kernel not booting

dougschwanke — Tue, 05 Nov 2013 14:32:02 GMT

I am trying to build kernel 3.5.7 on Yocto Dora. (using imx6qsabresd)

Everything builds without an error and I get a new uImage, as shown below. However, the Kernel hangs while starting up.

# I first clean before changing versions in order to clean up the 3.0.35 files...

bitbake -c cleansstate linux-imx

# change from 3.0.35 to 3.5.7 by adding the following line to your local.config

PREFERRED_VERSION_linux-imx_mx6 = "3.5.7"

# rebuild kernel

bitbake linux-imx

# rebuild image

bitbake core-image-minimal

=========================================

Output files...

tmp/deploy/images/imx6qsabresd/u-boot.imx -> u-boot-imx6qsabresd-v2013.10-r0.imx*

tmp/deploy/images/imx6qsabresd/u-boot-imx6qsabresd.imx -> u-boot-imx6qsabresd-v2013.10-r0.imx*

tmp/deploy/images/imx6qsabresd/u-boot-imx6qsabresd-v2013.10-r0.imx*

tmp/deploy/images/imx6qsabresd/uImage -> uImage--3.5.7-r0-imx6qsabresd-20131104212852.bin

tmp/deploy/images/imx6qsabresd/uImage--3.5.7-r0-imx6qsabresd-20131104212852.bin

tmp/deploy/images/imx6qsabresd/uImage--3.5.7-r0-imx6q-sabresd-20131104212852.dtb

tmp/deploy/images/imx6qsabresd/uImage-imx6qsabresd.bin -> uImage--3.5.7-r0-imx6qsabresd-20131104212852.bin

tmp/deploy/images/imx6qsabresd/uImage-imx6q-sabresd.dtb -> uImage--3.5.7-r0-imx6q-sabresd-20131104212852.dtb

=========================================

U-Boot 2013.10 (Nov 04 2013 - 09:49:56)

CPU: Freescale i.MX6Q rev1.2 at 792 MHz

Reset cause: POR

Board: MX6-SabreSD

DRAM: 1 GiB

MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2

*** Warning - bad CRC, using default environment

No panel detected: default to HDMI

Display: HDMI (1024x768)

In: serial

Out: serial

Err: serial

Net: FEC [PRIME]

Hit any key to stop autoboot: 0

mmc1 is current device

reading boot.scr

** Unable to read file boot.scr **

reading uImage

4686224 bytes read in 218 ms (20.5 MiB/s)

Booting from mmc ...

reading imx6q-sabresd.dtb

46128 bytes read in 20 ms (2.2 MiB/s)

## Booting kernel from Legacy Image at 12000000 ...

Image Name: Linux-3.5.7-1.0.0+g3285970

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 4686160 Bytes = 4.5 MiB

Load Address: 10008000

Entry Point: 10008000

Verifying Checksum ... OK

## Flattened Device Tree blob at 18000000

Booting using the fdt blob at 0x18000000

Loading Kernel Image ... OK

Using Device Tree in place at 18000000, end 1800e42f

Starting kernel ...

(hang)

Re: 3.5.7 Kernel not booting

hpdwally — Tue, 05 Nov 2013 15:44:37 GMT

I had the same issue with the boundary-devices build until I RTFM'd. I believe this(3.5.7) has all moved to dts/dtb, and you need to build the dtb and have it local, PLUS bootm needs a second address to locate the loaded dtb, and 2 more environment variables need to be set

Hi JR,

We haven’t documented the process, but you’ll need to build the dtbs target and copy arch/arm/boot/imx6q_nitrogen6x.dtb into /boot along-side the uImage file, and make sure you’re using our latest U-Boot and boot script.

You can see some of the changes here:

6x_bootscript.txt

You’ll also need to set a couple of environment variables:

U-Boot > setenv fdt_high 0xffffffff
U-Boot > setenv fdt_addr 0x13000000
U-Boot > saveenv

Re: 3.5.7 Kernel not booting

LeonardoSandova — Tue, 05 Nov 2013 16:17:17 GMT

If you have not sent this issue into meta-freescale list, please do it.

Re: 3.5.7 Kernel not booting

dougschwanke — Wed, 06 Nov 2013 13:53:10 GMT

Thanks John, I will check that out. In the mean time, here is a response from the [meta-freescale] group on the issue of the 3.5.7 kernel hanging.

They think we might be seeing issues with the new toolchain 4.8. There were some ARM errata workarounds in defconfig in 3.10 to fix issues with new gcc toolchain. Also the new eglibc has performance issues they are patching in the beta release. They suggest building on the 4.7 toolchain which they believe is the same one that 3.5.7 was tested against. Best to switch to 3.10 as that will go GA not 3.5.7 which was stopped to move to an LTS kernel. They think 3.10.9 is almost ready to be fully upstreamed into dora branch. So until it is merged, use the master branch.

Re: 3.5.7 Kernel not booting

LaurenPost — Wed, 13 Nov 2013 16:54:57 GMT

Hi Doug, I gave you the response on the toolchain. Did it work going down to the 4.7 gcc version?

3.10.9 will be upstreamed into dora branch by next week. Only remaining upstreaming is in meta-fsl-demos for image recipes.

Re: 3.5.7 Kernel not booting

niklasmolin — Wed, 04 Dec 2013 22:21:07 GMT

Hi Doug.

Did you manage to figure out what the problem is?

I have the same problem after I changed to the 3.10.9 kernel.

Thanks,

Niklas

Re: 3.5.7 Kernel not booting

dougschwanke — Fri, 13 Dec 2013 13:58:07 GMT

Yes , it did. Thanks.

Re: 3.5.7 Kernel not booting

dougschwanke — Fri, 13 Dec 2013 14:00:00 GMT

I have not been able to get 3.10.9 to build because master does not build for me. I have not changed anything and I am tired of having to rebuild and compile from scratch. Lauren's response in the meta-freescale list worked for me and I was able to continue.