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include/image*: add support for device-tree overlays

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Add new target feature 'dt-overlay' which makes DTC keep the symbol
names in the generated dtb.
Make sure additional DT overlay sources specified by the new device
variable DEVICE_DTS_OVERLAY get compiled together with the main DTS
(currently overlays got to be in the same folder). Let Build/fit pass
the generated DT overlay blobs to mkits.sh.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
2021-03-17 17:30:48 +00:00
parent 4e6de4f093
commit 6890f6fe13
4 changed files with 13 additions and 4 deletions
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scripts/target-metadata.pl
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@@ -45,6 +45,7 @@ sub target_config_features(@) {
/^rootfs-part$/ and $ret .= "\tselect USES_ROOTFS_PART\n";
/^boot-part$/ and $ret .= "\tselect USES_BOOT_PART\n";
/^testing-kernel$/ and $ret .= "\tselect HAS_TESTING_KERNEL\n";
/^dt-overlay$/ and $ret .= "\tselect HAS_DT_OVERLAY_SUPPORT\n";
}
return $ret;
}