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sh: Allow for kernel command line concatenation.

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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: Pawel Moll <pawel.moll@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Pawel Moll 2009-08-24 16:25:38 +09:00 committed by Paul Mundt
parent b46373e0d4
commit d724a9c9d5
2 changed files with 28 additions and 5 deletions
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27
arch/sh/Kconfig
View File

@ -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

6
arch/sh/kernel/setup.c
View File

@ -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 */