Device does not start in normal mode, need debug console

Type: Self-Compiled Firmware
SDK Package Name: ??
Modification Content: ??
Log: log.zip

I am starting with this device, and compiled the image for it.
Flahsed the device, and now it does not start in normal mode. It turns LAN1 leds on, then in 3 seconds off, then on again and so on.
Is there any way to have diagnostic console where I can see all the output starting U-boot? And potentially can see where boot fails?
Thanks.
tchip_askquestions
log.zip (155 Bytes)

Hello, which kind of device or board do you use? And firmware?

iHC-3308GW, openwrt build (I guess originally from here - https://gitlab.com/TeeFirefly/rk3308-linux).
Edit: it is NOT openwrt! It is buildroot.

Is there any open source openwrt for 3308GW? This one https://dev.t-firefly.com/thread-104203-1-1.html is a firmware, not a source code.

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