Board does not Boot

[Xedon]

Hello, i am realy sad my Board does not boot, i burnd an Offizial A20-Debian immage on my 16 GB micro sd card, put it in and nothing happend, The Green LED turns on and after a while it starts blinking... and iv got no HDMI output ....
Pleas help me ...

[JohnS]

Best to look at the console output as it tries to boot.  E.g. USB-TTL cable, cheap from ebay.

Same advice lots of times on here if you look.

John

[Lurch]

Sounds like it may be booting.  If the green LED goes on and starts blinking at 1-second rate after about 15 seconds, then it's doing OK.  If the ethernet LEDs are on (green-connect, yellow-traffic then the board is fine.  You just have to figure out what's wrong with the HDMI.  The USB-TTL cable is really the best bet.
The problem could possibly be in the HDMI cable or a mismatch in the setup:
( https://www.olimex.com/forum/index.php?topic=2114.msg13480#new )

[otyugh]

Hey.
I've eventually the exact same issue (green light blinks).
I even bought a 7" olimex screen ; it displays something when pluged in, or when I push the "pwr" button : everythings goes grey, then it displays for a few instant a battery full (100%), then black screen.
Nothing, then.

What I have :
- micro SD rank 10 flashed (A20_debian_kernel_3_4_LAN_USBx2_Cards_LCD_HDMI_SATA_TS_X_GPIO_OTG_MIC_Video_accel_release7)
- a 7" Olimex
- power supply is 12V, 2A


I ordered a USB serial-F, I hope I will be able to see forward. Anything obvious I am missing ?

[Lurch]

If you see a battery level display, then it's booting into Android, not the sdcard Linux.
With Android, you only have a certain amount of time to 'unlock' the screen by swiping - if this takes to long the board goes back to sleep, just like with a normal tablet or phone. 
The USB-TTL connector is the right way to go. You might also want to make an sdcard with Linux to try out.

[otyugh]

Why would I boot on android if my microSD pluged is flashed with the latest debian iso for A20 ?
I'm using a linux, made my microSD by "dd if=~/Bureau/A20_debian_kernel_3_4_LAN_USBx2_Cards_LCD_HDMI_SATA_TS_X_GPIO_OTG_MIC_Video_accel_release7.img of=/dev/sde bs=4M"


I never did installed anything android related. Maybe android is pre-loaded in nand ?

[JohnS]

If it boots Android from NAND despite having an SD card then something is wrong with the card or its image.

May be tough to debug without a uart cable.

John