Any news about your warranty? My board just died yesterday from nothing. using the serial to find out what is wrong, I’m receiving a lot of cpu errors and spontaneuous reboots, no matter what I do. Board from february the board is just useles from use only like a poe router and nothing more.
seems like i am now also affected. all was working like a charm, suddenly, only the red pwr led and a green sfp+ led. nothing blinking. did not yet test UART, will do this later. notice to me: i need a backup router …
Have you reinserted sdcard and changed bootswitches?
reinserted sd yes, also tried an old stable sd (backup sd), none worked. not sure what a vootswitch is?
thats all i get on UART:
Are you sure the bootswitches are set to sdcard?
Is the sdcard functional when inserted in laptop?
The bootrom does not find the bl2.
Which image are you using?
Do you have a valid image on emmc or nand?
i assume the new ultra stiff wifi cables pushed the pins up, you are right. i just switched them to 1:1 and now it boots
men, this should be really fixed in a revision. this jumper should be on board where nothing can simply change that. thanks!
i reassembled the device and indeed, they started to do the same thing again., Again, thanks, i would have never found that!
Thats why debug uart is important 
if you see bootrom board basicly works and simply does not find bl2,so either this is unacessible or bootswitches are wrong/not fixed correctly.
Bootrom → bl2 → bl31/fip/uboot → linux (kernel) → userspace (rootfs/initrd)
Dear All I have the same issue only power led and pci led Are on , i try to connect via UART BUT BLANK SCREEN ALSO I MAKE SURE its 3.3v and I installed new sd cad and same issue Thx
Have you checked your bootswitches? Right uart device on your pc? Right settings (speed,…)?
Yes and sometime i got question mark and most of times blank screen
That indicates wrong serial settings or bad connection at dupond plug. Also check gnd-gnd connection, not only tx-rx and rx-tx. The plugs should fit snug on the pin.
I meant, what I have had multiple times is bent metal inside the Dupont plug. Then it fits a bit loosely on the pin and the contact is bad. Then I had to replace the cable or opened the plug and bent metal in the original curve.
I see on the board the plastic of the plug is not aligned, some plugs are not straight, possibly a bad connection.
What are your serial settings?
Speed is 15200 and when I power up the board the fan work for a sec and then stop working and also I try to replace the sd card with new one noting work also I make sure the levers at the current position , and also i put my usbc meter to see what happed .
Thx
Must be 115200 8n1
Fan is not supported in early bootphase…it is only defined in linux kernel…maybe pin is pulled high by bootrom and then low in uboot.
Sorry i meant 115200. , So what should i do to fix it or to trace the cause ? Thx
Disable all flow control in serial settings…
You should always see some numbers on debug output at powerup from bootrom, no matter what switches, even without sd-card.
The fact that it is sometimes gibberish, points to a problem in the serial lines and/or serial settings.
Which terminal are you using?
Screen on Mac OS via terminal
screen /dev/tty.usbserial-14620 115200
and putty on windows
Try to find your flow control settings…
You set 8n1 (stop&parity) too? Rx/tx crossed and gnd connected?