[Design] PSU firmware update

[Lei YU]

On Wed, Jun 5, 2019 at 10:25 PM Matt Spinler <mspinler at linux.ibm.com> wrote:
>
>
> On 6/5/2019 1:18 AM, Lei YU wrote:
> >>> The PSU firmware code update will re-use the current interfaces to upload,
> >>> verify, and activate the image.
> >> We would like the option to be able to ship the PSU firmware as part of
> >> the BMC image (in the root filesystem). This means that it is already
> >> present and authenticated when the BMC boots. In this way, we know that
> >> the current BMC firmware plays well with the PSU firmware and have fewer
> >> variables to test for when making a release.
> > Because the PSU firmware is part of BMC image, this seems a completely
> > different approach, and more like part of BMC image update, is it?
> > I would expect this should not be part of this design, what do you think?
>
> FYI, I am 99% sure this is how IBM needs its systems to work as well.
> That being the case,
>
> will you also be handling this design?

Good to know.

Then a question comes up:
In which cases PSU firmware update shall be done?
1. It is updated together with BMC firmware update as described by Vernon
   Mauery;
2. It is updated independently with APIs, as described in this design doc.

Will 1 and 2 both be valid, or only 1 is the real case and we do not need to
support 2?

The reason I ask is because if we could get clear requirements, it is possible
to simplify the design.