Jump to content

Why stop at u-boot ?


hanguofu
 Share

Recommended Posts

Order Armbian Linux merch!

If the uart port is not connected , the u-boot stop after "Hit any key to stop autoboot:  2 1 0 "  ---- it is just what I guessed. If I hooked up the uart port with a debug board , I saw no output from screen. But if I press "Enter" key , the u-boot shows "=>" and ready for commands . A "reset" command can make the u-boot to reboot .

 

If the uart port is connected before power up , the u-boot boots normally. 
 

Link to comment
Share on other sites

i saw things like this too - easy workaround is to put a usb to serial converter there and plug it into one of the usb connectors of the box - i guess its a problem with proper grounding resulting in noise on the serial line

 

best wishes - hexdump

Link to comment
Share on other sites

9 hours ago, hanguofu said:

If the uart port is not connected , the u-boot stop after "Hit any key to stop autoboot:  2 1 0 "  ---- it is just what I guessed. If I hooked up the uart port with a debug board , I saw no output from screen. But if I press "Enter" key , the u-boot shows "=>" and ready for commands . A "reset" command can make the u-boot to reboot .

 

If the uart port is connected before power up , the u-boot boots normally. 
 

 

 

I had the same problem with some versions of the Amlogic S905W processor 

 

My workaround was to short the UART TX pin to ground using a small resistor. It fakes a UART connection and the boot continues 

 

If the step fails, try the same with the RX pin. 

 

Good luck!

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...