linux-kernel - Re: [PATCH] serial : convert early_uart to earlycon for 8250 fix 3 alias

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Date:	Fri, 22 Jun 2007 12:58:49 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Yinghai Lu <Yinghai.Lu@....COM>
CC:	Bjorn Helgaas <bjorn.helgaas@...com>, Alex Chiang <achiang@...com>,
	akpm@...ux-foundation.org, ak@...e.de,
	Gerd Hoffmann <kraxel@...hat.com>, rmk@....linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial : convert early_uart to earlycon for 8250 fix
 3 alias

Yinghai Lu wrote:
> [PATCH] serial : convert early_uart to earlycon for 8250 fix 3 alias
> 
> make the console=uart,io,0x3f8,9600n8 like console=uart8250,io,0x3f8,9600
> suggested by Andy Whitcroft.
>  
> Signed-off-by: Yinghai Lu <yinghai.lu@....com>
> 
> --- a/Documentation/kernel-parameters.txt	2007-06-21 10:12:48.000000000 -0700
> +++ b/Documentation/kernel-parameters.txt	2007-06-21 10:13:43.000000000 -0700
> @@ -467,16 +467,16 @@
>  			Documentation/networking/netconsole.txt for an
>  			alternative.
>  
> -		uart8250,io,<addr>[,options]
> -		uart8250,mmio,<addr>[,options]
> +		uart[8250],io,<addr>[,options]
> +		uart[8250],mmio,<addr>[,options]
>  			Start an early, polled-mode console on the 8250/16550
>  			UART at the specified I/O port or MMIO address,
>  			switching to the matching ttyS device later.  The
>  			options are the same as for ttyS, above.
>  
>  	earlycon=	[KNL] Output early console device and options.
> -		uart8250,io,<addr>[,options]
> -		uart8250,mmio,<addr>[,options]
> +		uart[8250],io,<addr>[,options]
> +		uart[8250],mmio,<addr>[,options]
>  			Start an early, polled-mode console on the 8250/16550
>  			UART at the specified I/O port or MMIO address.
>  			The options are the same as for ttyS, above.
> --- a/drivers/serial/8250_early.c	2007-06-21 10:04:25.000000000 -0700
> +++ b/drivers/serial/8250_early.c	2007-06-21 10:12:08.000000000 -0700
> @@ -210,8 +210,11 @@
>  	int err;
>  
>  	options = strstr(cmdline, "uart8250,");
> -	if (!options)
> -		return 0;
> +	if (!options) {
> +		options = strstr(cmdline, "uart,");
> +		if (!options)
> +			return 0;
> +	}

This could probabally be written as below and be a little clearer:

options = strstr(cmdline, "uart8250,");
if (!options)
	options = strstr(cmdline, "uart,");
if (!options)
	return 0;



>  
>  	options = strchr(cmdline, ',') + 1;
>  	if ((err = early_serial8250_setup(options)) < 0)
> @@ -227,6 +230,7 @@
>  	struct early_serial8250_device *device = &early_device;
>  	struct uart_port *port = &device->port;
>  	int line;
> +	int ret;
>  
>  	if (!device->port.membase && !device->port.iobase)
>  		return -ENODEV;
> @@ -235,8 +239,13 @@
>  	if (line < 0)
>  		return -ENODEV;
>  
> -	return update_console_cmdline("uart", 8250,
> +	ret = update_console_cmdline("uart", 8250,
> +			     "ttyS", line, device->options);
> +	if (ret < 0)
> +		ret = update_console_cmdline("uart", 0,
>  				     "ttyS", line, device->options);
> +
> +	return ret;
>  }
>  
>  early_param("earlycon", setup_early_serial8250_console);

Other than the little nit above I have tested this on the machine which
was all upset over the change and it works like a charm.

Acked-by: Andy Whitcroft <apw@...dowen.org>

-apw
-
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