[U-Boot] [RFC 2/2] env: Add prefix to error messages when loading env

[Wolfgang Denk <wd@denx.de>]

Dear Sam,

In message <20180717220912.11358-2-semen.protsenko@linaro.org> you wrote:
> This is just a draft to discuss ideas related to "Make U-Boot log great
> again" thread.
> 
> With this patch we will see something like:
> 
>     Loading Environment from FAT...
>        --> MMC: no card present
>        --> ** Bad device mmc 0 **
>        --> Failed (-5)

This may be ok in the error case, but...

>     Loading Environment from MMC...
>        --> OK

it is definitely really ugly in the normal, non-error case.

NAK.

>  void puts(const char *s)
>  {
> +	if (gd->pr_prefix) {
> +		const char *prefix = gd->pr_prefix;
> +
> +		gd->pr_prefix = NULL;
> +		puts(prefix);
> +		gd->pr_prefix = prefix;
> +	}
> +

Besides - global data is a precious resource on may systems,
sometimes limited to very few kB of memory.  It should be only used
to the extend where it really cannot be avoided, but not for any
such "beautifying" stuff.

Best regards,

Wolfgang Denk

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