linux-kernel - Re: [PATCH] x86_64 built-in command line

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Message-ID: <Pine.LNX.4.61.0607311342410.24292@chaos.analogic.com>
Date:	Mon, 31 Jul 2006 13:46:27 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"Matt Mackall" <mpm@...enic.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>, <ak@...e.de>
Subject: Re: [PATCH] x86_64 built-in command line


On Mon, 31 Jul 2006, Matt Mackall wrote:

> Allow setting a command line at build time on x86_64. Compiled but not
> tested.
>
> Signed-off-by: Matt Mackall <mpm@...enic.com>
>
> Index: linux/arch/x86_64/Kconfig
> ===================================================================
> --- linux.orig/arch/x86_64/Kconfig	2006-07-26 18:08:29.000000000 -0500
> +++ linux/arch/x86_64/Kconfig	2006-07-27 17:19:50.000000000 -0500
> @@ -558,6 +558,20 @@ config K8_NB
> 	def_bool y
> 	depends on AGP_AMD64 || IOMMU || (PCI && NUMA)
>
> +config CMDLINE_BOOL
> +	bool "Default bootloader kernel arguments" if EMBEDDED
> +
> +config CMDLINE
> +	string "Initial kernel command string" if EMBEDDED
> +	depends on CMDLINE_BOOL
> +	default "root=/dev/hda1 ro"
> +	help
> +	  On some systems, there is no way for the boot loader to pass
> +	  arguments to the kernel. For these platforms, you can supply
> +	  some command-line options at build time by entering them
> +	  here. In most cases you will need to specify the root device
> +	  here.
> +
> endmenu
>
> #
> Index: linux/arch/x86_64/kernel/setup.c
> ===================================================================
> --- linux.orig/arch/x86_64/kernel/setup.c	2006-07-26 18:08:29.000000000 -0500
> +++ linux/arch/x86_64/kernel/setup.c	2006-07-27 17:26:51.000000000 -0500
> @@ -289,6 +289,10 @@ static __init void parse_cmdline_early (
> 	int len = 0;
> 	int userdef = 0;
>
> +#ifdef CONFIG_CMDLINE_BOOL
> +	strlcpy(saved_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> +#endif
> +
> 	for (;;) {
> 		if (c != ' ')
> 			goto next_char;
>
> --
> Mathematics is the supreme nostalgia of our time.
> -

But this just makes it nice for __your__ embedded system. I suggest you
use:
> +	default "root=/dev/root ro"

The boot setup code makes a symlink to whatever your specific
setup requires.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.62 BogoMips).
New book: http://www.AbominableFirebug.com/
_
..

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