rm: boot sw update: include information about custom hardware require…

[vanmaegima]

…ments

Our reset logic for bootloader updates depends on having the WDOG_B pin connected to the PMIC, so add this to the docs.

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[vanmaegima]

@igoropaniuk based on our call today, I think this is a very important information to have in our docs. I don't know the best place to add it though.
@kprosise any thoughts?

[doanac]

Docs for ab80adf are browsable at: https://ci.foundries.io/projects/fio-docs/builds/2801/docs/artifacts/html/index.html

[vanmaegima]

@igoropaniuk does it apply to all imx or only imx8m?

[kprosise]

@igoropaniuk based on our call today, I think this is a very important information to have in our docs. I don't know the best place to add it though. @kprosise any thoughts?

I think where it is placed in this commit works well. With a quick glance, I didn't find anywhere else equally or more appropriate where it could go.

[vanmaegima]

@kprosise I will need to extend this PR to cover zynqMP as well. I will do that later today or tomorrow.

[angolini]

Suggested change

	The boot software update feature on iMX depends on having the WDOG_B signal of the SoC connected to the PMIC.
	The boot software update feature on iMX depends on having the ``WDOG_B`` signal of the SoC connected to the PMIC.

[igoropaniuk]

I think we should rewrite this section completely, and include more details about the usage of watchdog and in which case we expect watchdog to assert WDOG_B signal, and in what cases we need "soft" reset.

@vanmaegima
Would you mind if I created a new PR with extended description and we just close this one?

[igoropaniuk]

Added a comment above

[vanmaegima]

@igoropaniuk I think it's a great idea, I'll close this one