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

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Date:	Tue, 29 Apr 2014 11:22:28 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Rob Herring <robherring2@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

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