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| author | Genoud Richard | 2012-06-26 17:37:59 +0200 |
|---|---|---|
| committer | Russell King | 2012-07-09 18:39:39 +0200 |
| commit | d0f34a11ddab9b456e4caf9fc48d8d7e832e0e50 (patch) | |
| tree | 00c0dfd265bb37ced1c3f12626f17ec4b9df131a /arch/arm/Kconfig | |
| parent | ARM: 7436/1: Do not map the vectors page as write-through on UP systems (diff) | |
| download | kernel-qcow2-linux-d0f34a11ddab9b456e4caf9fc48d8d7e832e0e50.tar.gz kernel-qcow2-linux-d0f34a11ddab9b456e4caf9fc48d8d7e832e0e50.tar.xz kernel-qcow2-linux-d0f34a11ddab9b456e4caf9fc48d8d7e832e0e50.zip | |
ARM: 7437/1: zImage: Allow DTB command line concatenation with ATAG_CMDLINE
This patch allows the ATAG_CMDLINE provided by the bootloader to be
concatenated to the bootargs property of the device tree.
This is useful to merge static values defined in the device tree
with the boot loader's (possibly) more dynamic values, such as
startup reasons and more.
The bootloader should use the device tree to pass those values to
the kernel, but that's not always simple (old bootloader or very
small one).
The behaviour is the same as the one introduced by Victor Boivie in
4394c1244249198c6b85093d46935b761b36ae05 by extending the CONFIG_CMDLINE.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index b649c5904a4f..8c9d264f2108 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1960,6 +1960,25 @@ config ARM_ATAG_DTB_COMPAT bootloaders, this option allows zImage to extract the information from the ATAG list and store it at run time into the appended DTB. +choice + prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT + default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER + +config ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER + bool "Use bootloader kernel arguments if available" + help + Uses the command-line options passed by the boot loader instead of + the device tree bootargs property. If the boot loader doesn't provide + any, the device tree bootargs property will be used. + +config ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND + bool "Extend with bootloader kernel arguments" + help + The command-line arguments provided by the boot loader will be + appended to the the device tree bootargs property. + +endchoice + config CMDLINE string "Default kernel command string" default "" |