[PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

On Tue, Apr 29, 2014 at 8:16 AM, Rob Herring [off-list ref] wrote:

On Mon, Apr 28, 2014 at 9:56 PM, Yinghai Lu [off-list ref] wrote:

quoted

On Mon, Apr 28, 2014 at 4:24 PM, Rob Herring [off-list ref] wrote:

quoted

On Sat, Apr 26, 2014 at 1:29 AM, Yinghai Lu [off-list ref] wrote:

Thanks for finding these. I missed them in my build tests. This should fix them:

diff --git a/drivers/tty/serial/8250/8250_early.c

b/drivers/tty/serial/8250/8250_early.c
index e83c9db..2094c3b 100644

--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c

@@ -156,6 +156,11 @@ static int __init early_serial8250_setup(struct

earlycon_device *device,
 EARLYCON_DECLARE(uart8250, early_serial8250_setup);
 EARLYCON_DECLARE(uart, early_serial8250_setup);

+int __init setup_early_serial8250_console(char *cmdline)
+{
+       return setup_earlycon(cmdline, "uart8250", early_serial8250_setup);
+}
+
 int serial8250_find_port_for_earlycon(void)
 {
        struct earlycon_device *device = early_device;

that only handle "uart8250,", may need to add more lines to handle "uart,"

That is on purpose because the only 2 users use uart8250. I consider
this a legacy interface and use of "uart" is horrible because there
are lots of uarts which are not 8250.

Rob

quoted

+int __init setup_early_serial8250_console(char *cmdline)
+{
+       char *options;
+       options = strstr(cmdline, "uart8250,");
+       if (options)
+               return setup_earlycon(cmdline, "uart8250",
early_serial8250_setup);
+
+       options = strstr(cmdline, "uart,");
+       if (options)
+              return setup_earlycon(cmdline, "uart", early_serial8250_setup);
+
+      return 0;
+}

You want to obsolete "console=uart,io,0x3f8,115200n8" ?

 Let's check with Andrew. He suggested to use uart and uart8250 at that time.

Thanks

Yinghai