bootm: fit-image: hash node name too strict

[Marco Felsch]

Hi Sebastian,

On 25-01-07, Sebastian Groß wrote:
> Hello and a happy new year 2025 dear all,

thank you very much, you too :)

> I happened to have a fit-image which worked fine with u-boot and wanted to
> give it a try with barebox.
> Sadly I got yelled at for not having hashes for the kernel-1 `Image`
> provided in the fit-image.
> 
> Grepping the source code for the error message pointed to `fit_verify_hash`
> and `of_get_child_by_name` with `hash at 1` or `hash-1`.
> Neither is required by u-boot as it looks only for `FIT_HASH_NODENAME` which
> is defined as `hash`.

According the spec [1] it should be named hash-<number>. Checking the
U-Boot doc folder it seems like 'hash' was used in the early days of FIT
images since there is only one file 'doc/usage/fit/howto.rst' which is
using the plain 'hash' node name.

[1] https://fitspec.osfw.foundation/#hash-nodes

> Since the image is build by uboot's mkimage I would expect the itb's to be
> compatible. Or am I missing something?
> 
> Changing the following line in the `its`, ie. its build script
> ```
> - hash { algo = "${FIT_HASH_ALG}"; };
> + hash at 1 { algo = "${FIT_HASH_ALG}"; };
> ```
> made the fit-image work.

I can't find this line within the U-Boot src code. Can you provide a
link please?

> Perhaps another if-clause is required. Or some error message that states
> which property/string was searched for,
> since there were hashes in the image, but not where barebox expected them.

We could search for the legacy single 'hash' node name as well and print
a warning that this should be changed.

Regards,
  Marco

> 
> Regards
> 
> Sebastian Groß
> 
> --
> Sebastian Groß, B.Sc.
> 
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