diff options
| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2011-09-13 22:37:07 -0400 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-08-03 17:49:49 -0700 |
| commit | f7d783cc292186266622cfebb552fcf695aefd46 (patch) | |
| tree | 25b68b5d7aa06a4c11f4f93e718d3292d477884f /arch/arm/Kconfig | |
| parent | c00192e6a9cddb848b5cc8944893e1577085c897 (diff) | |
ARM: zImage: allow supplementing appended DTB with traditional ATAG data
Some old bootloaders can't be updated to a device tree capable one,
yet they provide ATAGs with memory configuration, the ramdisk address,
the kernel cmdline string, etc. To allow a device tree enabled
kernel to be used with such bootloaders, it is necessary to convert those
ATAGs into FDT properties and fold them into the DTB appended to zImage.
Currently the following ATAGs are converted:
ATAG_CMDLINE
ATAG_MEM
ATAG_INITRD2
If the corresponding information already exists in the appended DTB, it
is replaced, otherwise the required node is created to hold it.
The code looks for ATAGs at the location pointed by the value of r2 upon
entry into the zImage code. If no ATAGs are found there, an attempt at
finding ATAGs at the typical 0x100 offset from start of RAM is made.
Otherwise the DTB is left unchanged.
Thisstarted from an older patch from John Bonesio <bones@secretlab.ca>,
with contributions from David Brown <davidb@codeaurora.org>.
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Chinmay Kamat <ckamat@nvidia.com>
Change-Id: Ifb96adf6976da0f518c9c2cdad6be85f94c8ad1c
Original: b90b9a38251e9c89c34179eccde57411ceb5f1aa
Reviewed-on: http://git-master/r/107423
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fc9d147ae30e..bc3e8dc005bb 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1960,6 +1960,18 @@ config ARM_APPENDED_DTB location into r2 of a bootloader provided DTB is always preferable to this option. +config ARM_ATAG_DTB_COMPAT + bool "Supplement the appended DTB with traditional ATAG information" + depends on ARM_APPENDED_DTB + help + Some old bootloaders can't be updated to a DTB capable one, yet + they provide ATAGs with memory configuration, the ramdisk address, + the kernel cmdline string, etc. Such information is dynamically + provided by the bootloader and can't always be stored in a static + DTB. To allow a device tree enabled kernel to be used with such + bootloaders, this option allows zImage to extract the information + from the ATAG list and store it at run time into the appended DTB. + config CMDLINE string "Default kernel command string" default "" |