• Gary Jennejohn's avatar
    IOMUX: Add console multiplexing support. · 16a28ef2
    Gary Jennejohn authored
    Modifications to support console multiplexing.  This is controlled using
    CONFIG_SYS_CONSOLE_MUX in the board configuration file.
    
    This allows a user to specify multiple console devices in the environment
    with a command like this: setenv stdin serial,nc.  As a result, the user can
    enter text on both the serial and netconsole interfaces.
    
    All devices - stdin, stdout and stderr - can be set in this manner.
    
    1) common/iomux.c and include/iomux.h contain the environment setting
    implementation.
    2) doc/README.iomux contains a somewhat more detailed description.
    3) The implementation in (1) is called from common/cmd_nvedit.c to
    handle setenv and from common/console.c to handle initialization of
    input/output devices at boot time.
    4) common/console.c also contains the code needed to poll multiple console
    devices for input and send output to all devices registered for output.
    5) include/common.h includes iomux.h and common/Makefile generates iomux.o
    when CONFIG_SYS_CONSOLE_MUX is set.
    Signed-off-by: default avatarGary Jennejohn <garyj@denx.de>
    16a28ef2
common.h 19.5 KB