[RFC] Kernel command line from FIT image

[Olivier Benjamin]

Hello,

While reading section 5.7.3 of the FIT image spec [1], I noticed the
"cmdline" property:

"cmdline
Command line passed to the next boot stage, e.g. the operating system
kernel. The value is an UTF-8 encoded string." 

However, looking at the mkimage sources, more specifically
include/image.h [2], it looks like this property is unsupported.

If properly implemented so that the cmdline can be signed, this would
imho be a viable option for passing the dm-verity bootargs in verified boot.
It could be an alternative to the option of sourcing a script that has
to be referenced via the configuration, as discussed in [3].

I have not found a discussion regarding supporting this property in
U-Boot, has it been discussed and rejected, or has it not made it to
contributor's priority list?

Kind regards,

Olivier

[1]: https://fitspec.osfw.foundation/#optional-properties
[2]: https://elixir.bootlin.com/u-boot/v2026.01/source/include/image.h#L1095
 [3]:
https://source.denx.de/u-boot/u-boot/-/commit/bcc85b96b5ffbbce19a89747138feb873d918915