How to configure 4 CPUs on SABRE board for smart device

[jackeyko]

Hi Community,

I use the SABRE board on kernel-3.14.28.

The SABRE borad is I.MX6Q(4 cpus)

So, I checked number of CPU using cat /proc/cpuinfo.

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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
root@imx6qsabresd:~#

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but, cpu setting is 2 cpu.

I would like to know how to configure 4 CPUs in u-boot or kenel feature or device tree.

Thanks,

Jackey

[jackeyko]

Hi igor,

Thanks for your message.

I will check the uboot fuse NUM_CORES and attach the result.

Thanks,

Jackey

[igorpadykov]

Hi Jackey

from uboot log one can see :

"CPU:   Freescale i.MX6D rev1.2"

could you attach jtag or read from uboot fuse

NUM_CORES, it is described in Table 5-10. Fusemap Descriptions

i.MX6DQ Reference Manual

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

Best regards

igor

[jackeyko]

Hi igor,

I have downloaed the mfgtool2-yocto-mx6-sabresd-sdcard-sd4.vbs using imx-3.14.28_1.0.0_ga-mfg-tools and attached kernel_log.txt and printenv.

The imgage of mfgtool2-yocto-mx6-sabresd-sdcard-sd4.vbs is same.

Total of 2 processors is activated.

Please review the attached log.

Thanks,

Jackey

[jackeyko]

typo

PCIMX6QAVT10AC -> PCIMX6Q6AVT10AC

Thanks,

Jackey

[jackeyko]

Hi Igor,

Thanks for your support.

The full processor marking is PCIMX6QAVT10AC. and Part number of SABRE SD is MCIMX6Q-SDB

I have purchased RDIMX6SABREBRD product as below yellow marking.

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

Products	Parts	Order	Status	Package   Type and Termination Count	Budgetary   Price excluding tax(US$)
RDIMX6SABREBRD	MCIMX6SX-SDB	Y	Active	Hardware Only	1 @ US$399.00 each
RDIMX6SABREBRD	MCIMX6Q-SDB	Y	Active	Hardware Only	1 @ US$449.00 each
RDIMX6SABREBRD	MCIMX-LVDS1	Y	Active	Hardware Only	1 @ US$499.00 each
IMX53QSB	MCIMXHDMICARD	Y	Active	Hardware Only	1 @ US$49.00 each

I will check mfgtool2-yocto-mx6-sabresd-sdcard-sd4.vbs. and send  you the result.

Thanks,

Jackey

[jackeyko]

Hi igor,

I downloaded  3.14.28 kernel image using imx-3.14.28_1.0.0_ga-mfg-tools.

and have configured maxcpus=4 in u-boot  as bleow:

---------------------------------------------------------------------------------------------------------------------------------------------------

[printenv.txt]

setenv extra_bootargs maxcpus=4

setenv mmcargs 'setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} ${extra_bootargs}'

saveenv

----------------------------------------------------------------------------------------------------------------------------------------------------

But, CPUs are 2 core from kernel log.

Please find the attached kernel_log.txt

-----------------------------------------------------------------------------------------

[kernel_log.txt]

SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1

Preemptible hierarchical RCU implementation.

        RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.

RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2

CPU: Testing write buffer coherency: ok

CPU0: thread -1, cpu 0, socket 0, mpidr 80000000

Setting up static identity map for 0x106ba580 - 0x106ba5d8

CPU1: Booted secondary processor

CPU1: thread -1, cpu 1, socket 0, mpidr 80000001

Brought up 2 CPUs

SMP: Total of 2 processors activated.

CPU: All CPU(s) started in SVC mode.

-----------------------------------------------------------------------------------------

I would like to know extra settings for 4 CPUs.

Thanks,

Jackey

[igorpadykov]

Hi Jackey

what is full processor marking ?

Also probably you are running wrong image,

please use mfgtool2-yocto-mx6-sabresd-sdcard-sd4.vbs

in mfg tools folder.

~igor

[igorpadykov]

Hi Jackey

one can check with cat /proc/interrupts :

https://community.freescale.com/message/303749#303749

also  kernel boot parameters maxcpus=n limits the kernel to

using 'n' processors, as described in p.17 attached Release Notes.

Best regards

igor

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[jackeyko]

Hi Igor,

Thanks for your support.

I checked cat /proc/interrupts, but also the kernel log is CPU0 and CPU1.

------------------------------------------------------------------------------------------

root@imx6qsabresd:/# cat /proc/interrupts

           CPU0       CPU1

16:       2055       1746       GIC  29 Edge      twd

17:          0          0       GPC  55 Edge      i.MX Timer Tick

19:          0          0       GPC 115 Edge      120000.hdmi

23:          2          0       GPC  31 Edge      2008000.ecspi

24:        247          0       GPC  26 Edge      2020000.serial

25:          0          0       GPC  47 Edge      202c000.ssi

26:          0          0       GPC  12 Edge      2040000.vpu

35:          0          0  gpio-mxc   4 Edge      Volume Up

36:          0          0  gpio-mxc   5 Edge      Volume Down

65:          0          0  gpio-mxc   0 Edge      2198000.usdhc cd

67:          0          0  gpio-mxc   2 Edge      2194000.usdhc cd

128:          0          0  gpio-mxc  29 Edge      Power Button

.................

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I have a question.

How to set kernel boot parameters maxcpus=n

Thanks,

Jackey

[igorpadykov]

Hi Jackey

one can check sect.4.4 Downloading images

attached Linux Guide, it shows examples with

various uboot kernel boot parameters.

Best regards

igor