[U-Boot-Users] How console redirection is done

[yasosyaso]

Joey Oravec wrote:
> 
> "Ori Idan" <ori at helicontech.co.il> wrote in message 
> news:65487840707122317ve675e94x222e48968a8a730b at mail.gmail.com...
>>I am sorry, I can not understand the question.
>> U-boot always outputs to serial port.
>> If you would like to change to another serial port look at the
>> configuration file corresponding to your board under include/configs.
> 
> That's not exactly true. After the initial console (bootup) you can use
> more 
> than serial.
> 
> There are a few functions like drv_lcd_init in lcd.c that create a
> device_t 
> structure -- in my version they're all called within devices_init in 
> common/devices.c during boot. This defines a putc, puts, getc, and tstc to 
> handle I/O character by character. Once you call device_register() it will 
> available to the system. Using the environment variables stdin, stdout,
> and 
> stderr you can choose which device is active, and console.c calls the 
> appropriate function pointer. Set the variable and you can be printing on 
> the LCD instead.
> 
> Of course all this can be changed with a million CONFIG_ parameters, and
> it 
> is a little strange if you have several consoles available and no default.
> 
> -joey 
> 
> 
> 
> 
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