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

[Yinghai Lu <yinghai@kernel.org>]

On Tue, Apr 29, 2014 at 8:16 AM, Rob Herring <robherring2@gmail.com> wrote:
> On Mon, Apr 28, 2014 at 9:56 PM, Yinghai Lu <yinghai@kernel.org> wrote:
>> On Mon, Apr 28, 2014 at 4:24 PM, Rob Herring <robherring2@gmail.com> wrote:
>>> On Sat, Apr 26, 2014 at 1:29 AM, Yinghai Lu <yinghai@kernel.org> 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
>
>>
>> +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