On 06/10/2014 03:52 PM, Tony Luck wrote:
I think I figured it out. The function
serial8250_find_port_for_earlycon is failing to match 'uart' console to
'ttyS' console and transfer the options. It was also failing to create
an option string when the baud rate is probed. Can you try out the
below patch?

Rob

8<-------------------------------------------------------------------

diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index cfef801..4858b8a 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c

@@ -144,8 +144,11 @@ static int __init early_serial8250_setup(struct earlycon_device *device,
        if (!(device->port.membase || device->port.iobase))
                return 0;

-       if (!device->baud)
+       if (!device->baud) {
                device->baud = probe_baud(&device->port);
+               snprintf(device->options, sizeof(device->options), "%u",
+                        device->baud);
+       }

        init_port(device);

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 5131b5e..d20e6d8 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c

@@ -25,7 +25,7 @@
 #include <asm/serial.h>

 static struct console early_con = {
-       .name =         "earlycon",
+       .name =         "uart",
        .flags =        CON_PRINTBUFFER | CON_BOOT,
        .index =        -1,
 };