[U-Boot] printf in u-boot cannot support %f

[U-Boot] printf in u-boot cannot support %f

[ITechnology]

Hi,
The codes below:
   ...
  	double result1 =  3.14;
	printf("result1:%f\n", result1);// error 
 .... 
  turn out:
	result1:%f
    How can I  get the correct result? Thanks a lot!
The U-boot version is:
=> ver
U-Boot 2008.10 (Jul 15 2009 - 21:56:05) MPC512X
    I wan to a little more complex program in standalone mode in u-boot. Is it possilbe to port g-libc to u-boot standalone mode?
Tanks.
 Best regards,
Michael Franklin

                 

[U-Boot] printf in u-boot cannot support %f

[Wolfgang Denk]

Dear "ITechnology",

In message <201101112113066880790@126.com> you wrote:
>
> The codes below:
>    ...
>   	double result1 =  3.14;
> 	printf("result1:%f\n", result1);// error 
>  .... 
>   turn out:
> 	result1:%f

Yes, this is to be expected.

>     How can I  get the correct result? Thanks a lot!

Youcannot. We do not use nor support any FP operations in U-Boot.

>     I wan to a little more complex program in standalone mode in u-boot. Is it possilbe to port g-libc to u-boot standalone mode?

Everything is possible, assuming you throw enough manpower at it.

The real question however is if this makes sense. Usually, in such
situations it does not. You might find it more efficient to boot into
some OS instead.

Best regards,

Wolfgang Denk

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