i.MX6 Quad operating as dual?

[t_kuha]

Hi

I want some information on my SABRE board (MCIMX6Q-SDB) I bought several weeks ago.

Although it has i.MX6 Quad, when I boot it, I found it's operating as dual core.

(Invoking "cat /proc/cpuinfo" showed that the CPU is operating in dual core mode (see the result below).

root@imx6qsabresd:~# cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 10 (v7l)
Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10
processor       : 1
model name      : ARMv7 Processor rev 10 (v7l)
Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10
Hardware        : Freescale i.MX6 Quad/DualLite (Device Tree)
Revision        : 0000
Serial          : 0000000000000000

Added to that, the CPU has an engraving "DUAL_H" as shown below.)

So, I suspect 2 of the 4 cores are "killed" due to some reason.

And my question is: is this within specification of SABRE board or can I have this replaced with "true" quad version of the board?

Thank you in advance.

[igorpadykov]

i.MX6Q can be set to work as Dual using kernel boot parameter maxcpus=2

(limits the kernel to using 'n' processors). It may be recommended to use Demo Images:

Board Support Packages (29)

L3.14.52_1.1.0_MX6QDLSOLO (REV L3.14.52_1.1.0)

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

Best regards

igor

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[t_kuha]

igor,

Thank you for your reply, but I'm afraid that is not the answer I was looking for.

The problem is even though the "maxcpus=2" parameter is NOT specified, the i.MX6 Quad is operating in dual core mode.

But I want this to function as quad core.

For additional information, when I tried the same thing with another SABRE board (of course, with the same Freescale Demo Image), it was operating as quad core as expected.

(In this case the i.MX6 does not have "DUAL_H" engraving.)

Do you have any idea? & let me know if you need more information.

Regards

[igorpadykov]

suggest to contact local marketing or place where did you

buy this board.

~igor

[t_kuha]

igor,

Thank you for the suggestion.

I've been already in contact with my local reseller.

They say the manufacturer (Freescale maybe) has not been responding for about a month(, which is why I'm posting here).

Regards

[igorpadykov]

I could not find any info about such marking, so

suggest to contact local marketing

~igor

[t_kuha]

igor,

What specifically do you mean by "local marketing"?

Freescale/NXP branches in each country?

Regards

[igorpadykov]

yes

rgds

[t_kuha]

After contacting local distributor, suspicious units were replaced with correct ones (i.e. with the CPU operating as Quad).

Thanks you for your cooperation so far.

Regards