[PATCH V5 07/12] tools: Add script for converting public key into device tree include

[Jan Kiszka]

On 04.02.23 23:23, Simon Glass wrote:
> Hi Jan,
> 
> On Fri, 3 Feb 2023 at 23:35, Jan Kiszka <jan.kiszka at siemens.com> wrote:
>>
>> On 04.02.23 01:20, Simon Glass wrote:
>>> Hi Jan,
>>>
>>> On Fri, 3 Feb 2023 at 05:29, Jan Kiszka <jan.kiszka at siemens.com> wrote:
>>>>
>>>> From: Jan Kiszka <jan.kiszka at siemens.com>
>>>>
>>>> Allows to create a public key device tree dtsi for inclusion into U-Boot
>>>> SPL and proper during first build already. This can be achieved via
>>>> CONFIG_DEVICE_TREE_INCLUDES.
>>>>
>>>> Signed-off-by: Jan Kiszka <jan.kiszka at siemens.com>
>>>> ---
>>>>  tools/key2dtsi.py | 64 +++++++++++++++++++++++++++++++++++++++++++++++
>>>>  1 file changed, 64 insertions(+)
>>>>  create mode 100755 tools/key2dtsi.py
>>>
>>> Please can you build this into Binman instead? We really don't want
>>> any more of these scripts. Perhaps you can add a new entry type?
>>>
>>
>> I don't think you are requesting something that makes any sense:
>>
>> "Binman creates and manipulate *images* for a board from a set of binaries"
> 
> I mean that Binman can include a public key in the DT, if that it was
> you are wanting. We don't want to add scripts for creating images and
> pieces of images.
> 
> Perhaps I just don't understand the goal here. How would your script be used?
> 

We feed the generated dtsi into the U-Boot build, using
CONFIG_DEVICE_TREE_INCLUDES. This ensures that will be signed along with
the built artifacts. Have a look at patch 9 for the steps, specifically
the doc update bits. Full bitbake (Isar) integration is available under
[1], specifically [2] in combination with [3].

Jan

[1] https://github.com/siemens/meta-iot2050/tree/master/recipes-bsp/u-boot
[2] https://github.com/siemens/meta-iot2050/blob/master/recipes-bsp/u-boot/files/rules.tmpl
[3] https://github.com/siemens/meta-iot2050/blob/master/recipes-bsp/u-boot/files/secure-boot.cfg

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