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Diffstat (limited to 'doc/develop/devicetree/control.rst')
| -rw-r--r-- | doc/develop/devicetree/control.rst | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/develop/devicetree/control.rst b/doc/develop/devicetree/control.rst index 0e6f85d5af1..c71570d64b4 100644 --- a/doc/develop/devicetree/control.rst +++ b/doc/develop/devicetree/control.rst @@ -182,6 +182,24 @@ main file, in this order:: Only one of these is selected but of course you can #include another one within that file, to create a hierarchy of shared files. + +External .dtsi fragments +------------------------ + +Apart from describing the hardware present, U-Boot also uses its +control dtb for various configuration purposes. For example, the +public key(s) used for Verified Boot are embedded in a specific format +in a /signature node. + +As mentioned above, the U-Boot build system automatically includes a +`*-u-boot.dtsi` file, if found, containing U-Boot specific +quirks. However, some data, such as the mentioned public keys, are not +appropriate for upstream U-Boot but are better kept and maintained +outside the U-Boot repository. You can use CONFIG_DEVICE_TREE_INCLUDES +to specify a list of .dtsi files that will also be included when +building .dtb files. + + Relocation, SPL and TPL ----------------------- |