console_simple: fix compiler warning ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'next'

console_simple: Fix compilation ...

Since fprintf and console_puts now return the number of
character written the prototypes have changes. We forgot
to fix console_simple which now fails to compile with:

common/console_simple.c:48:6: error: conflicting types for 'fprintf'
include/stdio.h:57:5: note: previous declaration of 'fprintf' was here
common/console_simple.c:67:6: error: conflicting types for 'console_puts'
include/stdio.h:20:5: note: previous declaration of 'console_puts' was here

Fix this by returning the proper numbers of characters written.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: add console unregistering ...

Some console are transient, like the USB connected serial
console which should be removed when the USB connection is
severed.

Enable console removal for such devices.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

move version_string to seperate file ...

In a noninteractive environment barebox will be compiled without
command support. So move version_string to a seperate file which
is compiled unconditionally.
Also, display the banner when the simple console support is used.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console_simple: add fprintf / console_list for commands/loadb.c ...

commands/loadb.c doesn't build with CONFIG_CONSOLE_SIMPLE, because it uses
fprintf / for_each_console (which uses console_list).

Fix it by adding trivial implementations of both in console_simple.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

simple console: implement console_flush ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: add a simple console for saving space ...

Add a simple console layer which is not able to handle multiple
consoles for those who don't need it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>