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dm: core: Add livetree definitions

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Add a Kconfig option to enable a live device tree, built at run time from
the flat tree. Also add structure definitions and a root node.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2017-05-18 20:08:53 -06:00
parent fd7029029f
commit 5e060d8bcc
3 changed files with 120 additions and 0 deletions
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11
dts/Kconfig
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@@ -32,6 +32,17 @@ config SPL_OF_CONTROL
which is not enough to support device tree. Enable this option to
allow such boards to be supported by U-Boot SPL.
config OF_LIVE
bool "Enable use of a live tree"
depends on OF_CONTROL
help
Normally U-Boot uses a flat device tree which saves space and
avoids the need to unpack the tree before use. However a flat
tree does not support modifcation from within U-Boot since it
can invalidate driver-model device tree offsets. This option
enables a live tree which is available after relocation,
and can be adjusted as needed.
choice
prompt "Provider of DTB for DT control"
depends on OF_CONTROL