At present it is not possible to boot with the ttyNMI0 console treating character input normally. To use the console requires that kdb be entered and the nmi_console command be used to enable the console (or if only kgdb is present then gdb must directly manipulate the value of kgdb_nmi_tty_enabled).
Introducing a module parameter makes the console much more usable.
Signed-off-by: Daniel Thompson daniel.thompson@linaro.org Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Jiri Slaby jslaby@suse.cz Cc: linux-serial@vger.kernel.org --- drivers/tty/serial/kgdb_nmi.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c index cfadf29..9361d69 100644 --- a/drivers/tty/serial/kgdb_nmi.c +++ b/drivers/tty/serial/kgdb_nmi.c @@ -43,6 +43,11 @@ module_param_named(magic, kgdb_nmi_magic, charp, 0600); MODULE_PARM_DESC(magic, "magic sequence to enter NMI debugger (default $3#33)");
static bool kgdb_nmi_tty_enabled; +module_param_named(tty, kgdb_nmi_tty_enabled, bool, 0600); +MODULE_PARM_DESC(tty, "if set to false (default), characters received from " + "the UART will be passed exclusively to the knock " + "detector; when set to true characters will be passed " + "both to the knock detector and to the TTY layer");
static int kgdb_nmi_console_setup(struct console *co, char *options) {