Custom IMX6DL boards crashing, then running at 2GHz unless set to Single Core.

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Custom IMX6DL boards crashing, then running at 2GHz unless set to Single Core.

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mukelarvin
Contributor IV

We have some custom 1GHz IMX6DL based board running Android 4.4.2 using the 3.0.35 kernel and U-boot 2009.08. It seems like some of my boards are accidentally overclocking themselves?

Most of the boards will boot fine and report the following:

root@sabresd_6dq:/ # cat /proc/cpuinfo

Processor       : ARMv7 Processor rev 10 (v7l)

processor       : 0

BogoMIPS        : 790.52

processor       : 1

BogoMIPS        : 790.52

Features        : swp half thumb fastmult vfp edsp neon vfpv3

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x2

CPU part        : 0xc09

CPU revision    : 10

Hardware        : Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board

Revision        : 61011

Serial          : 140549d4df64630d

Some of the boards won't boot into the OS and will have kernel errors and Android segmentation faults. Some of the good boards have fallen into this category after a day or two of operation. They report the following:

root@sabresd_6dq:/ # cat /proc/cpuinfo

Processor       : ARMv7 Processor rev 10 (v7l)

processor       : 0

BogoMIPS        : 1988.29

processor       : 1

BogoMIPS        : 1988.29

Features        : swp half thumb fastmult vfp edsp neon vfpv3

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x2

CPU part        : 0xc09

CPU revision    : 10

Hardware        : Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board

Revision        : 61011

Serial          : 221a31d4df64630d

If I add the boot argument "nosmp" all of the boards will boot into single core mode successfully. They report the following:

root@sabresd_6dq:/ # cat /proc/cpuinfo

Processor       : ARMv7 Processor rev 10 (v7l)

processor       : 0

BogoMIPS        : 790.52

Features        : swp half thumb fastmult vfp edsp neon vfpv3

CPU implementer : 0x41

CPU architecture: 7

CPU variant     : 0x2

CPU part        : 0xc09

CPU revision    : 10

Hardware        : Freescale i.MX 6Quad/DualLite/Solo Sabre-SD Board

Revision        : 61011

Serial          : 221a31d4df64630d

Can anyone suggest what might be happening to these boards? How can I keep them running at 800Mhz in dual core mode?

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Luke

this looks as arm errata discussed below

Re: freescale android kernel have scheduling problem !!!

IMX6Q system hang-up problem / linux kernel(3.0.35)

Re: i.MX6Q: How to increase the VPU frequency?

one can try patches in above links or better to move to

latest kernels L3.14.28_1.0.0_iMX6QDLS_BUNDLE

IMX6_KK443_200_ANDROID_DOCS i.MX6 Android kk4.4.3_2.0.0 BSP

Best regards

igor

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