[U-Boot] Silencing SPL output

[Heiko Schocher]

Hello Chris,

Am 16.10.2017 um 02:38 schrieb Chris Packham:
> This is probably something of a foot-gun but here we go...
> 
> I was wondering if it's worth providing the ability to silence the
> output from the SPL. CONFIG_SILENT_CONSOLE exist for u-boot proper but
> the SPL preloader_console_init bypasses anything that would set
> GD_FLG_SILENT. Even if it didn't the SPL probably doesn't have access
> to any environment that would allow it to be set/unset.
> 
> I was thinking about adding a SPL specific CONFIG option that would
> set GD_FLG_SILENT (probably in spl_init). Aside from re-compiling
> there wouldn't be any way of making the SPL loud. Is this a reasonable
> idea or is it just asking for boards to be bricked with no way of
> telling what went wrong?

I have a at91 based board in mainline, which has no SPL output
enabled (as there is no space for it), see:

configs/smartweb_defconfig

Do not define
CONFIG_SPL_SERIAL_SUPPORT=y

bye,
Heiko
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