Hi, Simon, > On 1 March 2016 at 02:06, Alison Wang <[email protected]> wrote: > > When LCD/HDMI is connected to LS1021ATWR or LS1021AQDS, the console > > output should be shown on the monitor. > > > > If CONFIG_DM_SERIAL and CONFIG_DM_STDIO are both enabled, serial > > device is registered and added to the stdio list in serial-uclass.c. > > Then, vga device will be registered and added to the stdio list in > cfb_console.c. > > So serial device is at the head of the stdio list and will be chosen > > as the input and output device in console_init_r(). It will cause the > > console output can't be shown on the monitor. > > > > If CONFIG_DM_STDIO is disabled when using CONFIG_DM_SERIAL. First, vga > > device is registered and added to the stdio list in cfb_console.c. > > Then serial device will be registered and added to the stdio list in > > drv_system_init(). So vga device is at the head of the stdio list and > > will be chosen as the input and output device in console_init_r(). The > > console output will be shown on the monitor. > > > > The patch is to disabled CONFIG_DM_STDIO for LCD/HDMI display. > > > > Signed-off-by: Alison Wang <[email protected]> > > Have you tried enabling CONFIG_CONSOLE_MUX? > [Alison Wang] Thanks for your advice. I got your idea, and tried to enable CONFIG_CONSOLE_MUX and CONFIG_SYS_CONSOLE_IS_IN_ENV. Then after setting "stdout=serial,vga", the console output is both shown on monitor and serial terminal.
This patch is not a good way to fix the problem, please abandon it. Enabling CONFIG_SYS_CONSOLE_IS_IN_ENV is the best way to fix the problem, and Enabling CONFIG_CONSOLE_MUX could be used to shown the console output on multiple devices simultaneously. Best Regards, Alison Wang _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
