Currently, Yocto only supports FIT setups in extlinux for providing and
applying Device Tree Overlays. It even has an additional requirement of
needing the base FDT image node to have a load property outside of the
DRAM location where the FIT data is stored. This is being fixed in
U-Boot, c.f.
https://lore.kernel.org/u-boot/20241219-extlinux-relocate-dtb-when-dtbo-v1-1-fe5eeb8fd...@cherry.de/
Until that is merged, one needs to set UBOOT_DTB_LOADADDRESS (not
UBOOT_DTBO_LOADADDRESS!) when building the FIT image. One can then boot
a FIT image and apply FDTOs by setting UBOOT_EXTLINUX_KERNEL_IMAGE to
the path to the fitimage on disk followed by (no space!)
'#<conf-1>#<conf-2>' with <conf-1> being the name of the config node
with the base FDT, and <conf-2> the name of the config node with the
FDTO to apply.
For FIT-less setups, the FDTOVERLAYS (or devicetree-overlay) property
needs to be set per label. This is what this patch series does.
Signed-off-by: Quentin Schulz <quentin.sch...@cherry.de>
---
Quentin Schulz (2):
uboot-extlinux-config.bbclass: simplify FDT/FDTDIR logic
uboot-extlinux-config.bbclass: add support for DTBOs
meta/classes-recipe/uboot-extlinux-config.bbclass | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
---
base-commit: 783347d27b179d85098dc2166bc8234a08b7811b
change-id: 20241217-extlinux-overlays-1ebfbb73fc81
Best regards,
--
Quentin Schulz <quentin.sch...@cherry.de>
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