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authorVictor Boivie <victor.boivie@sonyericsson.com>2011-05-04 17:07:55 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-05-12 10:13:22 +0100
commit4394c1244249198c6b85093d46935b761b36ae05 (patch)
tree3a0c30dc915b85ee5b2190eaa3ed2c6ad530aab0 /arch
parentc1b0db56604b4ccc55a325104b14093aeedeb829 (diff)
downloadop-kernel-dev-4394c1244249198c6b85093d46935b761b36ae05.zip
op-kernel-dev-4394c1244249198c6b85093d46935b761b36ae05.tar.gz
ARM: 6893/1: Allow for kernel command line concatenation
This patch allows the provided CONFIG_CMDLINE to be concatenated with the one provided by the boot loader. This is useful to merge the static values defined in CONFIG_CMDLINE with the boot loader's (possibly) more dynamic values, such as startup reasons and more. Signed-off-by: Victor Boivie <victor.boivie@sonyericsson.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@sonyericsson.com> Signed-off-by: Oskar Andero <oskar.andero@sonyericsson.com> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/Kconfig21
-rw-r--r--arch/arm/kernel/setup.c13
2 files changed, 27 insertions, 7 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3f3faaa..7fd33a3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1747,16 +1747,31 @@ config CMDLINE
time by entering them here. As a minimum, you should specify the
memory size and the root device (e.g., mem=64M root=/dev/nfs).
+choice
+ prompt "Kernel command line type" if CMDLINE != ""
+ default CMDLINE_FROM_BOOTLOADER
+
+config CMDLINE_FROM_BOOTLOADER
+ bool "Use bootloader kernel arguments if available"
+ help
+ Uses the command-line options passed by the boot loader. If
+ the boot loader doesn't provide any, the default kernel command
+ string provided in CMDLINE will be used.
+
+config CMDLINE_EXTEND
+ bool "Extend bootloader kernel arguments"
+ help
+ The command-line arguments provided by the boot loader will be
+ appended to the default kernel command string.
+
config CMDLINE_FORCE
bool "Always use the default kernel command string"
- depends on CMDLINE != ""
help
Always use the default kernel command string, even if the boot
loader passes other arguments to the kernel.
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
-
- If unsure, say N.
+endchoice
config XIP_KERNEL
bool "Kernel Execute-In-Place from ROM"
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 006c1e8..6dce209 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -672,11 +672,16 @@ __tagtable(ATAG_REVISION, parse_tag_revision);
static int __init parse_tag_cmdline(const struct tag *tag)
{
-#ifndef CONFIG_CMDLINE_FORCE
- strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
-#else
+#if defined(CONFIG_CMDLINE_EXTEND)
+ strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
+ strlcat(default_command_line, tag->u.cmdline.cmdline,
+ COMMAND_LINE_SIZE);
+#elif defined(CONFIG_CMDLINE_FORCE)
pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
-#endif /* CONFIG_CMDLINE_FORCE */
+#else
+ strlcpy(default_command_line, tag->u.cmdline.cmdline,
+ COMMAND_LINE_SIZE);
+#endif
return 0;
}
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