[U-Boot] How to silence the output of U-Boot

[Stefano Babic <sbabic@denx.de>]

Hi Frank,

On 07/03/2014 10:17, Frank Ihle wrote:
> Hi everyone,
> 
> I searched the Internet but the help I found didn't work. I hope someone here may know how to fix it, here's the situation:
> 
> I have this ARM9 SAM9G25 which is accessed by its ttyS0. I
>  want to disable all of the output, that was made during the U-Boot (v. 2010.06) 
> boot, to decrease the CPU's load. Therefore there is the 
> 
> 
>   setenv silent 1
> 

Your U-Boot is too old.

> 
> 
> parameter, which i put into the BOOTCMD string like:
> 
> 
> 
>   #define CONFIG_BOOTCOMMAND   " setenv silent 1;" \
> 
> "bootm "
> 
> 
> 
> and there is (as mentioned in the Readme.silent http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=blob;f=doc/README.silent;hb=v2013.10 ) the

As you see, patches was integrated in 2013. You are running an old
U-Boot version, when silent was not supported. Please update to 2014.01
or (better) use the current git tree.

> BTW
>  (I'm not sure if this is related to this) in the referenced link there 
> is the information, that u-boot sets the kernel command line to 
> "console=" so that in the end there will be no output for the kernel 
> too, but that didn't happen and it doesn't even happen if i force to 
> boot Linux with "console=" in the default Linux command line string

Usually, it helps if you pass "quiet" to the kernel command line.

Best regards,
Stefano Babic


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