[U-Boot] [PATCH v2] dm: serial: Add a REQUIRE_SERIAL_CONSOLE option for boards with no serial port

[Simon Glass]

On 8 August 2015 at 09:45, Hans de Goede <hdegoede at redhat.com> wrote:
> Currently the serial code assumes that there is always at least one serial
> port (and panics / crashes due to null pointer dereferences when there is
> none).
>
> This makes it impossible to use u-boot on boards where there is no (debug)
> serial port, because e.g. all uart pins are muxed to another function.
>
> This commit adds a CONFIG_REQUIRE_SERIAL_CONSOLE Kconfig option, which
> defaults to y (preserving existing behavior), which can be set to n on
> such boards to make them work.
>
> This commit only implements this for CONFIG_DM_SERIAL=y configs, as allowing
> running without a serial port for CONFIG_DM_SERIAL=n configs is non trivial,
> and is not necessary at this moment.
>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> ---
> Changes in v2:
> -Fix some typos in the Kconfig description / help-text.
> ---
>  drivers/serial/Kconfig         | 11 +++++++++++
>  drivers/serial/serial-uclass.c | 20 +++++++++++++++++---
>  2 files changed, 28 insertions(+), 3 deletions(-)

Acked-by: Simon Glass <sjg at chromium.org>