Add support for the debug UART so that sandbox provides build testing for this feature. Signed-off-by: Simon Glass <sjg at chromium.org> --- configs/sandbox_defconfig | 2 ++ drivers/serial/Kconfig | 11 +++++++++++ drivers/serial/sandbox.c | 17 +++++++++++++++++ 3 files changed, 30 insertions(+) Applied to u-boot-dm