@@ -383,7 +383,20 @@ config NULL_TTY
available or desired.
In order to use this driver, you should redirect the console to this
- TTY, or boot the kernel with console=ttynull.
+ TTY, boot the kernel with console=ttynull, or enable
+ CONFIG_NULL_TTY_DEFAULT_CONSOLE.
+
+ If unsure, say N.
+
+config NULL_TTY_DEFAULT_CONSOLE
+ bool "Support for console on ttynull"
+ depends on NULL_TTY=y && !VT_CONSOLE
+ help
+ Say Y here if you want the NULL TTY to be used as a /dev/console
+ device.
+
+ This is similar to CONFIG_VT_CONSOLE, but without the dependency on
+ CONFIG_VT. It uses the ttynull driver as the system console.
If unsure, say N.
@@ -96,6 +96,19 @@ static int __init ttynull_init(void)
return 0;
}
+#ifdef CONFIG_NULL_TTY_DEFAULT_CONSOLE
+static int __init ttynull_register(void)
+{
+ if (console_set_on_cmdline)
+ return 0;
+
+ add_preferred_console("ttynull", 0, NULL);
+
+ return 0;
+}
+console_initcall(ttynull_register);
+#endif
+
static void __exit ttynull_exit(void)
{
unregister_console(&ttynull_console);