[U-Boot] [PATCH] spl: add option to disable SPL banner output

[Lukasz Majewski]

Hi Philipp,

> > On 25 Jan 2018, at 18:37, Lukasz Majewski <lukma at denx.de> wrote:
> > 
> > From: Anatolij Gustschin <agust at denx.de>
> > 
> > Selecting this option will reduce SPL boot time by approx. 6 ms
> > (e. g. with 70 bytes long banner string at 115200 baud).
> > 
> > Signed-off-by: Anatolij Gustschin <agust at denx.de>
> > Tested-by: Lukasz Majewski <lukma at denx.de>  
> 
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> 
> See below for a nitpick.
> 
> > ---
> > 
> > common/spl/Kconfig | 7 +++++++
> > common/spl/spl.c   | 2 ++
> > 2 files changed, 9 insertions(+)
> > 
> > diff --git a/common/spl/Kconfig b/common/spl/Kconfig
> > index d686b1ecbd..d1f9cae6b7 100644
> > --- a/common/spl/Kconfig
> > +++ b/common/spl/Kconfig
> > @@ -118,6 +118,13 @@ config SPL_SEPARATE_BSS
> > 	  location is used. Normally we put the device tree at the
> > end of BSS but with this option enabled, it goes at
> > _image_binary_end.
> > 
> > +config SPL_DISABLE_BANNER_PRINT
> > +	bool "Disable output of the SPL banner 'U-Boot SPL ...'"
> > +	help
> > +	  If this option is enabled, SPL will not print the banner
> > with version
> > +	  info. Selecting this option could be useful to reduce
> > SPL boot time
> > +	  (e.g. approx. 6 ms slower, when output on i.MX6 with
> > 1152000 baud).  
> 
> You seem to be off by “times 10” for the baud-rate.

Extra boost :-)

Fixed in v2. Thanks for spotting.

> 
> > +
> > config SPL_DISPLAY_PRINT
> > 	bool "Display a board-specific message in SPL"
> > 	help
> > diff --git a/common/spl/spl.c b/common/spl/spl.c
> > index 76c1963611..898c416a66 100644
> > --- a/common/spl/spl.c
> > +++ b/common/spl/spl.c
> > @@ -477,8 +477,10 @@ void preloader_console_init(void)
> > 
> > 	gd->have_console = 1;
> > 
> > +#ifndef CONFIG_SPL_DISABLE_BANNER_PRINT
> > 	puts("\nU-Boot SPL " PLAIN_VERSION " (" U_BOOT_DATE " - " \
> > 			U_BOOT_TIME ")\n");
> > +#endif
> > #ifdef CONFIG_SPL_DISPLAY_PRINT
> > 	spl_display_print();
> > #endif
> > -- 
> > 2.11.0
> >   
> 



Best regards,

Lukasz Majewski

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