Commit d724a9c9 authored by Pawel Moll's avatar Pawel Moll Committed by Paul Mundt
Browse files

sh: Allow for kernel command line concatenation. 



So far kernel command line arguments could be passed in by a bootloader
or defined as CONFIG_CMDLINE, which completely overwriting the first one.

This change allows a developer to declare selected kernel parameters in
a kernel configuration (eg. project-specific defconfig), retaining
possibility of passing others by a bootloader.

The obvious examples of the first type are MTD partition or
bigphysarea-like region definitions, while "debug" option or network
configuration should be given by a bootloader or a JTAG boot script.

Signed-off-by: default avatarPawel Moll <pawel.moll@st.com>
Signed-off-by: default avatarStuart Menefy <stuart.menefy@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent b46373e0

arch/sh/Kconfig

+23 −4
Original line number Diff line number Diff line
@@ -767,12 +767,31 @@ config UBC_WAKEUP 


	  If unsure, say N.



config CMDLINE_BOOL

	bool "Default bootloader kernel arguments"

choice

	prompt "Kernel command line"

	optional

	default CMDLINE_OVERWRITE

	help

	  Setting this option allows the kernel command line arguments

	  to be set.



config CMDLINE_OVERWRITE

	bool "Overwrite bootloader kernel arguments"

	help

	  Given string will overwrite any arguments passed in by

	  a bootloader.



config CMDLINE_EXTEND

	bool "Extend bootloader kernel arguments"

	help

	  Given string will be concatenated with arguments passed in

	  by a bootloader.



endchoice



config CMDLINE

	string "Initial kernel command string"

	depends on CMDLINE_BOOL

	string "Kernel command line arguments string"

	depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND

	default "console=ttySC1,115200"



endmenu

arch/sh/kernel/setup.c

+5 −1
Original line number Diff line number Diff line
@@ -404,10 +404,14 @@ void __init setup_arch(char **cmdline_p) 
	if (!memory_end)

		memory_end = memory_start + __MEMORY_SIZE;



#ifdef CONFIG_CMDLINE_BOOL

#ifdef CONFIG_CMDLINE_OVERWRITE

	strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));

#else

	strlcpy(command_line, COMMAND_LINE, sizeof(command_line));

#ifdef CONFIG_CMDLINE_EXTEND

	strlcat(command_line, " ", sizeof(command_line));

	strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));

#endif

#endif



	/* Save unparsed command line copy for /proc/cmdline */

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