+ The size of the pre-console buffer affects how much console output
+ can be held before it overflows and starts discarding earlier
+ output. Normally there is very little output at this early stage,
+ unless debugging is enabled, so allow enough for ~10 lines of
+ text.
+
+ This is a useful feature if you are using a video console and
+ want to see the full boot output on the console. Without this
+ option only the post-relocation output will be displayed.
+
+config PRE_CON_BUF_ADDR
+ hex "Address of the pre-console buffer"
+ depends on PRE_CONSOLE_BUFFER
+ default 0x2f000000 if ARCH_SUNXI && MACH_SUN9I
+ default 0x4f000000 if ARCH_SUNXI && !MACH_SUN9I
+ help
+ This sets the start address of the pre-console buffer. This must
+ be in available memory and is accessed before relocation and
+ possibly before DRAM is set up. Therefore choose an address
+ carefully.
+
+ We should consider removing this option and allocating the memory
+ in board_init_f_init_reserve() instead.
+
+config CONSOLE_MUX
+ bool "Enable console multiplexing"
+ default y if DM_VIDEO || VIDEO || LCD
+ help
+ This allows multiple devices to be used for each console 'file'.
+ For example, stdout can be set to go to serial and video.
+ Similarly, stdin can be set to come from serial and keyboard.
+ Input can be provided from either source. Console multiplexing
+ adds a small amount of size to U-Boot. Changes to the environment
+ variables stdout, stdin and stderr will take effect immediately.
+
+config SYS_CONSOLE_IS_IN_ENV
+ bool "Select console devices from the environment"
+ default y if CONSOLE_MUX
+ help
+ This allows multiple input/output devices to be set at boot time.
+ For example, if stdout is set to "serial,video" then output will
+ be sent to both the serial and video devices on boot. The
+ environment variables can be updated after boot to change the
+ input/output devices.
+
+config SYS_CONSOLE_OVERWRITE_ROUTINE
+ bool "Allow board control over console overwriting"
+ help
+ If this is enabled, and the board-specific function
+ overwrite_console() returns 1, the stdin, stderr and stdout are
+ switched to the serial port, else the settings in the environment
+ are used. If this is not enabled, the console will not be switched
+ to serial.
+
+config SYS_CONSOLE_ENV_OVERWRITE
+ bool "Update environment variables during console init"
+ help
+ The console environment variables (stdout, stdin, stderr) can be
+ used to determine the correct console devices on start-up. This
+ option writes the console devices to these variables on console
+ start-up (after relocation). This causes the environment to be
+ updated to match the console devices actually chosen.
+
+config SYS_CONSOLE_INFO_QUIET
+ bool "Don't display the console devices on boot"
+ help
+ Normally U-Boot displays the current settings for stdout, stdin
+ and stderr on boot when the post-relocation console is set up.
+ Enable this option to supress this output. It can be obtained by
+ calling stdio_print_current_devices() from board code.
+
+config SYS_STDIO_DEREGISTER
+ bool "Allow deregistering stdio devices"
+ default y if USB_KEYBOARD
+ help
+ Generally there is no need to deregister stdio devices since they
+ are never deactivated. But if a stdio device is used which can be
+ removed (for example a USB keyboard) then this option can be
+ enabled to ensure this is handled correctly.