Nanopi 2 fire boot problem

hagard
After building output by buildroot , I found 4 files in image dir :
u-boot.bin uimage rootfs.tar.gz and rootfs.tar. i flushed With sdfuse
nanopi master , of course i delete zimage from prebuilt dir. At finish I
test  board with HDMI connect but screen show only color bars and blue LED
on board is light continuously.
What is problem? in build root making? or in SD Flushing ?

davef
I would suggest using PSU-ONECOM or some other UART adapter and minicom to
view your boot messages.

hagard
I can't use any other part.

davef
Looking at your boot messages is a common task.  It is a very necessary
skill.

You could look at syslog on your SD card using another computer, something
might get logged there during the boot process.

hagard
No result.
how i can convert 3 files to one img file?

hagard
how i can look boot messages or syslog?

davef
> I would suggest using PSU-ONECOM or some other UART adapter and
> minicom to view your boot messages.

> You could look at syslog on your SD card using another computer,
> something might get logged there during the boot process.

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