I.MX6D Frequent restart!

[tommyduan]

   We have a project using IMX6. Recently, the customer returned part of the machine, and the machine was restarted frequently after starting up, printing the following ERROR log information:

Where would you like to help analyze?

There are several defective pieces in the same batch!

nter ======board_late_init========
l2955152 85 ms
46050 16 ms
yusw-enter kernel entry
    1.053816]   No soundcards found.
3] Freeing unused kernel memory: 212K (804b0000 - 804e5000)
INIT:
Running boot scripts (/etc/rc.boot)
IPC: ipc s2160+0 records in
2160+0 records out
4147200 bytes (4.1 MB[    2.225395] imx-ipuv3 2400000.ipu: IPU DMFC DP H0a: Using internal LDO instead of VDDD
i mapping ok
gister success
INIT: Running /etc/rcS.d/S03mountall.sh start...
[    4.452801] FAT-fs (mmcblk3p6): Volumerun fsck.
INIT: Running /etc/rcS.d/S04udev start...
[    4.636249INIT: Running /etc/rcS.d/S36udev-cache start...
INIT: Running /etc/rcS.d/S37populate-volatile.sh start...
INIT: Running /etc/rcS.d/S39hostname.sh start...
6.30 3.53
Leave EPT rc script
INIT: Entering runlevel: 5
6.37 3.53
Enter EPT rc script
rting syslogd/klogd: done
INIT: Running /eConfiguring network interfaces... [    6.690613] libphy: PHY fixed-0:00 not found
start...
dropbear.
INIT: Running /etc/rc5.d/S99rc.local start...
c/rc5.d/S99rmnologin.sh start...
rface
[    6.889769] misc  in simukey_open
e=c0dc0000, irq=142)
[    7.073599] usbcore: registered new device driver usb
us number 1
detected
2-0:1.0: 1 port detected

[    7.595055] usbcore: registB Serial support registered for cp210x

[    7.641584] usbcore: registered new interface driver usb[    7.668013] SCSI subsystem initialized
 driver usb-storage
rot
root@imx6qsabresd:~#t./ICU51x.sWARNING: Vivante GPU detected. Support for sinsized internal formats instead.
GDC_SetGDCVersion IN !!
GDC_SetGDCVersion IN !!
./ICU51x.sh: line ormats instead.
GDC_SetGDCVersion IN !!
GDC_SetGDCVersion IN !!
511.exe
ormats instead.
GDC_SetGDCVersion IN !!
511.exe
GDC_SetGDCVersion IN !!
 line 36:  4223 Segmentation fault      exec ./ICU511.exe
ormats instead.
GDC_SetGDCVersion IN !!
ormats instead.
GDC_SetGDCVersion IN !!
./ICU51x.sh: line 36:  5308 Segmentation fault      exec ./ICU511.exe
ormats instead.
ats RGB8 and RGBA8 has been disabled, using unsized internal formats instead.
511.exe
GDC_SetGDCVersion IN !!
WARNING: Vivante GPUas been disabled, using unsized internal formats instead.
GDC_SetGDCVersion IN !!
511.exe
GDC_SetGDCVersion IN !!
ERROR:

[igorpadykov]

Hi Tommy

one can test memory

i.MX6/7 DDR Stress Test Tool V3.00 

and check hardware using IMX6DQ6SDLHDG, Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applic...

Best regards
igor
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[tommyduan]

We now find that changing DVFS to fixed frequency output does not restart! What's the reason? We follow the DEMO program code. Now we use the 6D model. Are the parameters set differently for different models? Could you please provide the configuration parameters for this part of different models? Voltage corresponding to different frequencies (6DL,6D,6Q)

[igorpadykov]

Hi Tommy

reason may be the same -  memory issues:

i.MX6/7 DDR Stress Test Tool V3.00 

for voltages corresponding to different frequencies (6DL,6D,6Q)

suggest to refer to cpu freq driver description in Linux Manual

Linux 4.14.98_2.2.0 Documentation

Best regards
igor

[tommyduan]

How is this dynamically adjusted voltage controlled? How to realize voltage change at different frequency with one LDO.