Convert CONFIG_SYS_DEVICE_NULLDEV to Kconfig
This converts the following to Kconfig:
CONFIG_SYS_DEVICE_NULLDEV
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index 62d78c5..5a6d0e0 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -635,6 +635,22 @@
removed (for example a USB keyboard) then this option can be
enabled to ensure this is handled correctly.
+config SPL_SYS_STDIO_DEREGISTER
+ bool "Allow deregistering stdio devices in SPL"
+ 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. This is very rarely
+ needed in SPL.
+
+config SYS_DEVICE_NULLDEV
+ bool "Enable a null device for stdio"
+ help
+ Enable creation of a "nulldev" stdio device. This allows silent
+ operation of the console by setting stdout to "nulldev". Enable
+ this to use a serial console under board control.
+
endmenu
menu "Logging"