[PATCH 1/6] arm64: Unconditionally call unflatten_device_tree()

Call this function unconditionally so that we can populate an empty DTB on platforms that don't boot with a firmware provided or builtin DTB. There's no harm in calling unflatten_device_tree() unconditionally. If there isn't a valid initial_boot_params dtb then unflatten_device_tree() returns early

[PATCH 2/6] um: Unconditionally call unflatten_device_tree()

Call this function unconditionally so that we can populate an empty DTB on platforms that don't boot with a command line provided DTB. There's no harm in calling unflatten_device_tree() unconditionally. If there isn't a valid initial_boot_params dtb then unflatten_device_tree() returns early. Cc:

[PATCH 6/6] of: Add KUnit test to confirm DTB is loaded

Add a KUnit test that confirms a DTB has been loaded, i.e. there is a root node, and that the of_have_populated_dt() API works properly. Cc: Rob Herring Cc: Frank Rowand Cc: David Gow Cc: Brendan Higgins Signed-off-by: Stephen Boyd --- drivers/of/.kunitconfig | 3 ++ drivers/of/Kconfig

[PATCH 5/6] of: unittest: treat missing of_root as error instead of fixing up

From: Frank Rowand unflatten_device_tree() now ensures that the 'of_root' node is populated with the root of a default empty devicetree. Remove the unittest code that created 'of_root' if it was missing. Verify that 'of_root' is valid before attempting to attach the testcase-data subtree. Remove

[PATCH 3/6] of: Always unflatten in unflatten_and_copy_device_tree()

We want to populate an empty DT whenever CONFIG_OF is enabled so that overlays can be applied and the DT unit tests can be run. Make unflatten_and_copy_device_tree() stop printing a warning if the 'initial_boot_params' pointer is NULL. Instead, simply copy the dtb if there is one and then unflatten

[PATCH 0/6] of: populate of_root node if bootloader doesn't

Arch maintainers, please ack/review patches. This is a resend of a series from Frank last year[1]. I worked in Rob's review comments to unconditionally call unflatten_device_tree() and fixup/audit calls to of_have_populated_dt() so that behavior doesn't change. I need this series so I can add DT

[PATCH 4/6] of: Create of_root if no dtb provided by firmware

From: Frank Rowand When enabling CONFIG_OF on a platform where 'of_root' is not populated by firmware, we end up without a root node. In order to apply overlays and create subnodes of the root node, we need one. Create this root node by unflattening an empty builtin dtb. If firmware provides a f