u_boot prompt?

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u_boot prompt?

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BarryWarsaw
Contributor I

I've been reading about changing u_boot parameters, but I actually have no idea how to get a u_boot prompt to do this.  i.MX53 QSB.  I created a new boot microSD using the instructions on freescale, and the machine boots just fine, but I never see any kind of prompt before getting the Ubuntu desktop.  I see a penguin in the upper left corner, then nothing until boot is complete.

 

Did I mess up the microSD flashing?  Is there some key sequence I need to hit during the boot process?  How can I get a u_boot prompt in order to change some of the boot parameters?

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KrishnaPavan
Contributor II

You mean to say that it can be done so with the help of a RS232 Serial port also?


Because, I have tried and nothing could be done when the board is connected to RS232, But If I use USB2Serial, then its working fine.


Fabio Estevam said:

When you power up the board, U-boot should come out on the serial console. You will have a few seconds to interrupt the boot process and get access to the U-boot prompt.

 

In order to interrupt the boot process just hit any key in the terminal (minicom/hyperterminal) during the very first seconds.

 

Regards,

 

Fabio Estevam

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fabio_estevam
NXP Employee
NXP Employee

When you power up the board, U-boot should come out on the serial console. You will have a few seconds to interrupt the boot process and get access to the U-boot prompt.

 

In order to interrupt the boot process just hit any key in the terminal (minicom/hyperterminal) during the very first seconds.

 

Regards,

 

Fabio Estevam

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rogerio_silva
NXP Employee
NXP Employee
Take a look on your serial config on your pc. It must be set at: 115200 8N1 and port on my ps is /dev/ttyS0
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