10-24-2019, 10:46 PM
(10-24-2019, 11:20 AM)Nikolay_Po Wrote: You may try to connect TTL_UART-to-USB converter to SBC UART Tx pin, it is transmitting at 1500000 Bauds and connect this converter to a notebook (or to a PC with uninterruptible supply). May be you will got some shutdown or boot messages at the moment of power loss and restart. The hardware UART Tx pin is working right from a Rockchip bootloader start, even without of a media. May be you will got some clue what is wrong.
Another cause of boot failure may be an electromagnetic interference. Particularly if your boards are connected to something else except a power supply by a long wires. Can you reproduce boot failure on your table where nothing else except eMMC flash and UART-USB converter is connected to the SBC?
Yes i tried SBC UART with my laptop. I got following observations-
1) Device after got OS curroption, gave me nothing in console even i tried power button press.
2) Same Device after reflash gave me decent Console out and device worked too.
3) Some device which are not booting at all were producing error of "Cap error" in Console that indicates some capacitor go damaged and caused Hardware damage.
I am trying to reproduce the same issue here in my workspace and it has been around 20 days but not able to reproduce same.
Will also try your point of Electromagnetic interferene here.
Some more people are saying that they got same issue with eMMC. So may be i should continue with good quality SD Card for my future projects.
