Hi Pali,
On Mon, 5 Sept 2022 at 03:31, Pali Rohár pali@kernel.org wrote:
On certain places it is required to flush output print buffers to ensure that text strings were sent to console or serial devices. For example when printing message that U-Boot is going to boot kernel or when U-Boot is going to change baudrate of terminal device.
Therefore introduce a new flush() and fflush() functions into console code. These functions will call .flush callback of associated stdio_dev device.
As this function may increase U-Boot side, allow to compile U-Boot without this function. For this purpose there is a new config CONSOLE_FLUSH_SUPPORT which is enabled by default and can be disabled. It is a good idea to have this option enabled for all boards which have enough space for it.
When option is disabled when U-Boot defines just empty static inline function fflush() to avoid ifdefs in other code.
Signed-off-by: Pali Rohár pali@kernel.org
Changes in v3:
- Added macro STDIO_DEV_ASSIGN_FLUSH()
common/Kconfig | 6 +++++ common/console.c | 61 +++++++++++++++++++++++++++++++++++++++++++++ include/_exports.h | 3 +++ include/stdio.h | 15 +++++++++++ include/stdio_dev.h | 7 ++++++ 5 files changed, 92 insertions(+)
Reviewed-by: Simon Glass sjg@chromium.org