sota: introduce OSTREE_MULTI_DEVICETREE_SUPPORT

ostree supports multiple devicetrees provided that there is no
/lib/modules/$kversion/devicetree installed on rootfs, in which case,
a uboot variable 'fdtdir' would be written to /boot/loader/uEnv.txt
instead of fdt_file.

Introduce OSTREE_MULTI_DEVICETREE_SUPPORT to control that, when it's
set to '0', there is no functional changes with current implementation,
while it's set to '1', then /lib/modules/$kversion/devicetree would not
be installed and the end users need set their own fdtfile/fdt_file in
boot script to locate the devicetree in 'fdtdir'.

Signed-off-by: Ming Liu <ming.liu@toradex.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/classes/sota.bbclass b/classes/sota.bbclass
index fde00cd..e6a0f8b 100644
--- a/classes/sota.bbclass
+++ b/classes/sota.bbclass
@@ -32,6 +32,7 @@ OSTREE_BOOT_PARTITION ??= "/boot"
 OSTREE_KERNEL ??= "${KERNEL_IMAGETYPE}"
 OSTREE_DEPLOY_DEVICETREE ??= "0"
 OSTREE_DEVICETREE ??= "${KERNEL_DEVICETREE}"
+OSTREE_MULTI_DEVICETREE_SUPPORT ??= "0"
 
 INITRAMFS_IMAGE ?= "initramfs-ostree-image"