[U-Boot] [U-Boot, V3] kconfig: add config option for shell prompt

[Tom Rini]

On Mon, Aug 03, 2015 at 12:36:58PM +0300, Nikita Kiryanov wrote:

> Add option to set shell prompt string from menuconfig and migrate
> boards globally.
> 
> The migration is done as follows:
> - Boards that explicitly and unconditionally set CONFIG_SYS_PROMPT had the
>   entry moved to their defconfig files.
> - Boards that defined some kind of #ifdef logic which selects the
>   CONFIG_SYS_PROMPT (for example qemu-mips) got an #undef CONFIG_SYS_PROMPT
>   right before the #ifdef logic and were left alone.
> - This change forces CONFIG_SYS_PROMPT to be a per board decision, and thus
>   CONFIG_SYS_PROMPT was removed from all <soc>_common.h and <arch>_common.h
>   files. This results in a streamlined default value across platforms, and
>   includes the following files: spear-common, sunxi-common, mv-common,
>   ti_armv7_common, tegra-common, at91-sama5_common, and zynq-common.
> - Boards that relied on <arch/soc>_common.h values of CONFIG_SYS_PROMPT were
>   not updated in their respective defconfig files under the assumption that
>   since they did not explicitly define a value, they're fine with whatever
>   the default is.
> - On the other hand, boards that relied on a value defined in some
>   <boards>_common.h file such as woodburn_common, rpi-common,
>   bur_am335x_common, ls2085a_common, siemens_am33x_common, and
>   omap3_evm_common, had their values moved to the respective defconfig files.
> - The define V_PROMPT was removed, since it is not used anywhere except for
>   assigning a value for CONFIG_SYS_PROMPT.
> 
> Cc: Tom Rini <trini at konsulko.com>
> Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: Igor Grinberg <grinberg at compulab.co.il>
> Signed-off-by: Nikita Kiryanov <nikita at compulab.co.il>

Applied to u-boot/master, thanks!

-- 
Tom
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