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: Pawel Moll <pawel.moll@st.com> Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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2 changed files with 28 additions and 5 deletions
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@ -767,12 +767,31 @@ config UBC_WAKEUP
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If unsure, say N.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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choice
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prompt "Kernel command line"
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optional
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default CMDLINE_OVERWRITE
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help
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Setting this option allows the kernel command line arguments
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to be set.
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config CMDLINE_OVERWRITE
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bool "Overwrite bootloader kernel arguments"
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help
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Given string will overwrite any arguments passed in by
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a bootloader.
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config CMDLINE_EXTEND
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bool "Extend bootloader kernel arguments"
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help
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Given string will be concatenated with arguments passed in
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by a bootloader.
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endchoice
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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string "Kernel command line arguments string"
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depends on CMDLINE_OVERWRITE || CMDLINE_EXTEND
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default "console=ttySC1,115200"
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endmenu
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@ -404,10 +404,14 @@ void __init setup_arch(char **cmdline_p)
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if (!memory_end)
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memory_end = memory_start + __MEMORY_SIZE;
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#ifdef CONFIG_CMDLINE_BOOL
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#ifdef CONFIG_CMDLINE_OVERWRITE
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strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
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#else
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strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
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#ifdef CONFIG_CMDLINE_EXTEND
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strlcat(command_line, " ", sizeof(command_line));
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strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
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#endif
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#endif
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/* Save unparsed command line copy for /proc/cmdline */
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