Could not use printf after init process

[wilbur.chan]

When booting , Kernel could not print on console after calling  run_init_process-->kernel_execve("/sbin/init")

 

I guess that printf in busybox  might fail  after the init process began.

 

Any sugguestion on how to trace this problem? Thank you in advance.

 

 

Regards,

 

 

 

[Ralf Baechle DL5RB]

On Tue, Nov 10, 2009 at 11:37:20PM +0800, wilbur.chan wrote:

> When booting , Kernel could not print on console after calling
> run_init_process-->kernel_execve("/sbin/init")
>
> I guess that printf in busybox  might fail  after the init process began.
>
> Any sugguestion on how to trace this problem? Thank you in advance.

I assume you meant printk, not printf.

If kernel_execve() is successful the function won't return so code following
that statement won't be executed.

  Ralf

[wilbur.chan]

2009/11/11 Ralf Baechle <ralf@...>

On Tue, Nov 10, 2009 at 11:37:20PM +0800, wilbur.chan wrote:

I assume you meant printk, not printf.

If kernel_execve() is successful the function won't return so code following
that statement won't be executed.

 Ralf

It was 'printf' in init process which was generated by busybox.

 

After I replaced 'init' with a simple 'hello wolrd' executable , which was like kernel_execve("/hello wolrd"),

 

it could not print the 'hello wolrd' either.