Kernel prints are not coming while booting in custom imx6ull

[cs_raryu]

Hi,

Kernel prints are not coming while booting Linux 4.1.15 on custom imx6ull board. I am using UART 8 as my debug port, related to that I have done configuration in boot arguments at U-boot, Kernel and rootfs. While booting I am able to get complete u-boot prints, but after Starting kernel ... print comes, it will skip the kernel prints and again it will start somewhere in the middle. Below are my boot logs,

Booting using the fdt blob at 0x83000000
Using Device Tree in place at 83000000, end 8300b59d

Starting kernel ...

fxas2100x 3-0020: read chip ID 0xfffffff5 is not equal to 0xd1 for fxas21000 or 0xd6/0xd7 fxas21002!
no file given for LUN0
g_mass_storage ci_hdrc.0: failed to start g_mass_storage: -22
mag3110 3-000e: read chip ID 0xfffffff5 is not equal to 0xc4!
cpu cpu0: dev_pm_opp_get_opp_count: device OPP not found (-19)
INIT: version 2.88 booting
Starting udev
udevd[94]: bind failed: No such file or directory

error binding udev control socket
udevd[94]: error binding udev control socket

bootlogd: cannot allocate pseudo tty: No such file or directory
Populating dev cache
udev-cache: update failed!
Fri Feb 3 10:52:52 UTC 2017
INIT: Entering runlevel: 5
Configuring network interfaces... ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
Starting system message bus: dbus.
Starting syslogd/klogd: done

After this prints system will get hung. Could you please suggest me to resolve this issue?

Thanks and Regards

Rohithraj

[cs_raryu]

Hi Igor,

Thanks for the response.

I tried by running the DDR test and updating the DDR calibration coefficients but still not resolved.

Thanks and Regards

Rohithraj

[igorpadykov]

Hi Rohithraj

what uboot used in the case, is it nxp uboot from

source.codeaurora.org/external/imx/uboot-imx repository

mx6ullevk\freescale\board - uboot-imx - i.MX U-Boot 

Best regards
igor

[cs_raryu]

Hi Igor,

Yes. We are using NXP u-boot.

Thanks and Regards,

Rohithraj

[igorpadykov]

Hi Rohithraj

one can debug it using AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor

[igorpadykov]

Hi Rohithraj

for custom board recommended first run ddr test

i.MX6/7 DDR Stress Test Tool V3.00 

and update uboot *.cfg file with new ddr calibration coefficients

found from test

mx6ullevk\freescale\board - uboot-imx - i.MX U-Boot 

Best regards
igor
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